A method for controlling the plant type of potted dahlia female parent

Abstract

The present invention relates to a method for controlling the plant type of potted dahlia mother plants, belonging to the technical field of plant type control. The method comprises four steps: planting, primary pinching, secondary pinching, and harvesting seed strips. The method is simple and reliable, and can effectively control the plant type of dahlia mother plants. In Kunming, Yunnan, the mother plants are planted in March, and preparations for removing and replanting the mother plants are carried out in early December. Within a nine-month production cycle, the output of qualified seed strips can reach 80-120 per plant, making it easy to promote and apply.

Description

Technical Field

[0001] The invention belongs to the technical field of plant type control, and particularly relates to a method for controlling the plant type of a potted dahlia female plant. Background Art

[0002] The dahlia (Dahlia pinnata Cav.), also known as dahlia, daphnia, oriental daisy, dahlia, and sweet potato flower, is a perennial herbaceous plant of the Asteraceae family and genus Dahlia, with large, club-shaped tubers. Its stem is erect, heavily branched, 1.5-2 meters tall, and sturdy. Native to Mexico, the Mexicans consider it a symbol of generosity and splendor, revering it as their national flower. Cultivated in most countries around the world, new varieties are constantly being developed. According to statistics, there are over 30,000 dahlia varieties, making it one of the most diverse flower species in the world.

[0003] Dahlia is a perennial herb with large, club-shaped tubers. The stem is erect, heavily branched, 1.5–2 meters tall, and robust. The leaves are pinnately divided 1–3 times, with upper leaves sometimes undivided. The lobes are ovate or oblong-ovate, gray-green beneath, and glabrous on both sides. The inflorescence head is large, with a long peduncle, often pendulous, and 6–12 cm wide. The outer bracts are approximately five involucral, ovate-elliptic, and foliose, while the inner bracts are membranous and elliptic-lanceolate. The ray flowers are single-layered, white, red, or purple, often ovate, with three indistinct teeth at the apex, or entire. The tubular flowers are yellow, sometimes consisting entirely of ray flowers in cultivated varieties. The achenes are oblong, 9–12 mm long and 3–4 mm wide, black, flat, and have two indistinct teeth. Flowering occurs from June to December, and fruiting occurs from September to October.

[0004] Dahlias, with their diverse and varied flower colors and shapes, are considered one of the world's most famous flowers. They are also highly durable and are often used as cut flowers. Whether on a home balcony or in a garden setting, dahlias' regal and elegant presence is a common sight. Currently, dahlia propagation methods include cuttings, division, and sowing. Division, best performed in spring between March and April, has a low propagation coefficient and is susceptible to infection after cutting. Sowing cannot guarantee the excellent properties of the mother plant and can degenerate. Cuttings are the most commonly used method, typically taken between June and August. Cuttings are taken from 15 cm long branches, retaining three buds. The base leaves are removed and the cuttings are inserted. Blooms begin in the autumn of the same year. However, the low propagation coefficient still cannot meet the growing demand. Furthermore, the short propagation cycle prevents the supply of qualified seedlings year-round.

[0005] Therefore, how to overcome the shortcomings of the existing technology is an urgent problem to be solved in the field of plant shape control technology. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies of the prior art and provide a method for controlling the plant type of a potted dahlia female plant.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A method for controlling the plant type of a potted dahlia female plant comprises the following steps:

[0009] Step (1), planting: Select a robust potted dahlia mother plant seedling with a height of 8 cm and 4 large leaves, and plant it in a potted seedbed; the substrate is a mixture of peat soil and perlite with a volume ratio of 6:4 (20-40 nm);

[0010] Step (2), pinching once: When the seedlings planted in step (1) grow to 8 mature leaves, pinch the seedlings once:

[0011] Step (3), secondary pinching: when the plant after the first pinching treatment in step (2) sprouts 5-6 lateral buds and the lateral buds grow to 4 mature leaves, a second pinching treatment is performed;

[0012] Step (4), harvesting seed strips: when the nutrient buds on the plants treated in step (3) grow to 4 mature leaves, leave a pair of mature leaves from the bottom of the nutrient buds upwards, and harvest the upper part of the pair of mature leaves as seed strips; harvest the seed strips every 4 days, and pre-cool the harvested seed strips;

[0013] During the entire production process, the lighting time is required to be no less than 16 hours.

[0014] Note: The entire production process described in the present invention starts from the day the mother plant is planted to the day the mother plant is removed.

[0015] Furthermore, it is preferred that in step (1), the height of the potted seedling bed is 0.65m, the pot type is a two-color pot with a diameter of 210mm, the inner side is black and the outer side is red, 1 plant / pot, and the pot placement density is 16 pots / m 2 .

[0016] Furthermore, preferably, in step (2), the specific method of the one-time topping treatment is: leaving 6 mature leaves on the plant from bottom to top, breaking off the stem at the node between the third and fourth pairs of leaves, and removing the top part.

[0017] Furthermore, preferably, in step (3), the specific method of the secondary pinching treatment is: leaving 1-2 mature leaves on the lateral buds of the plant from bottom to top and performing the topping treatment.

[0018] Furthermore, preferably, if the plant after the treatment in step (2) sprouts 2 to 4 lateral buds, and the lateral buds grow unevenly, when the top bud among the lateral buds grows to 4 leaves, the top bud is removed with one pair of mature leaves left; the other lateral buds are removed with 1 to 2 pairs of mature leaves left as the secondary pinching.

[0019] Furthermore, preferably, in step (4), the time from harvesting the seed strips to sending them to the pre-cooling room should not exceed 1 hour, and the pre-cooling temperature should be 8-10°C.

[0020] Furthermore, preferably, in step (4), the quality standards for harvesting seed strips are as follows: the seed strips are 2-3 cm in length, have one pair of mature leaves and one pair of heart leaves, no flower buds, no diseased leaves, and the leaves are normal and smooth without spots.

[0021] Furthermore, preferably, during the entire production process, the optimal illumination time is 19 hours per day.

[0022] Furthermore, it is preferred that when the plant's crown reaches 14-18 cm, 2 cm of petiole is left at the base of the leaves, and the mature leaves are trimmed. The mature leaves inside the crown are trimmed, and the mature leaves outside the crown can be retained for photosynthesis, so as to achieve the effect of ventilation and light exposure inside the crown. The frequency of trimming large leaves is 1-2 times / month. The purpose of this step is to remove the mature leaves inside and on the top of the plant, while the mature leaves on the side can be retained for photosynthesis. After the trimming, the leaf axils of the dahlia mother plant are exposed to the outside, with sufficient light, which is conducive to the germination of new buds and promoting growth.

[0023] In step (1), the peat soil is preferably Pinnacle peat soil, and the planting depth is such that the matrix in the pot is flush with the upper surface of the matrix block of the plug tray seedling.

[0024] In the present invention, the vegetative buds refer to the side buds that germinate after the first pinching and grow into side branches after the second pinching, and the buds growing on the side branches are the vegetative buds.

[0025] The first pinching is usually done two weeks after planting, when the plant's roots are firmly established. The top of the plant should be leveled to avoid uneven tops. For the same variety of mother plant, the first pinching should ideally be completed within a week and can be divided into two or three batches.

[0026] Secondary pinching is generally carried out multiple times and in a timely manner. In actual operation, it can be arranged to be done 2 to 3 times a week. Note: Secondary pinching is only one stage in the entire planting cycle. During the period of secondary pinching, this frequency is always followed. The present invention has measures to control plant type in special circumstances: if the germination is poor after the first pinching, and there are 2 to 4 side branches and the growth is uneven, a second pinching can be done in advance to leave a pair of large leaves on the top buds; considering the fullness of the side branches of the mother plant and the light conditions of the bottom side buds, 1-2 pairs of large leaves can be left on the bottom side branches of the mother plant for the second pinching.

[0027] The mother plant enters the seed cutting harvesting period 3 months after transplanting, and the seed cuttings are harvested every 4 days. Seed cutting harvesting technique: Use the thumb and index finger of your left hand to gently pinch the top of the seed cutting leaf, and use the blade in your right hand to cut at the harvesting node and then pick the seed cutting. After the seed cuttings are harvested, they need to be stored in small seed cutting bags (with holes punched in), and the bags should be labeled (variety name, harvesting date, harvesting quantity, harvester). After the seed cuttings are harvested, the seed cuttings are placed upright in the seed cutting bags with the leaf tips facing upwards (stem nodes facing downwards), and then put into baskets. After the seed cuttings are harvested, the transportation personnel should promptly send the seed cuttings to the cold storage for pre-cooling operations. The time from the time the seed cuttings are harvested to the time they are sent to the pre-cooling room should not exceed 1 hour. The pre-cooling temperature of the seed cutting cold storage is 8-10℃.

[0028] Dahlia is a light-sensitive species. In order to avoid flower bud differentiation in the dahlia mother plant, the light exposure time is required to be no less than 16 hours, and the optimal light exposure time is 19 hours / day.

[0029] When the crown width of the dahlia plant reaches 14-18cm, leave a 2cm petiole at the base of the leaves and remove the mature leaves of the entire plant in batches to ensure that the leaf axils and nutrient buds in all directions receive sufficient light, promote germination and nutrient bud development, and improve the ventilation of the entire plant; the frequency of trimming mature leaves is 1-2 times / month.

[0030] Research has found that the present invention rationally controls plant shape, ensuring that the lower portion of the mother plant is well ventilated, reducing disease and facilitating pest control. It also ensures that nutrients and light are evenly distributed in the upper portion of the mother plant, resulting in robust and sufficient seedlings and preventing problems such as jointing and weak shoots caused by insufficient light and malnutrition. The method of the present invention can produce 80-120 qualified seedlings per plant, with significant economic benefits.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The method is simple and reliable, and can effectively control the plant type of dahlia mother plants. In Kunming, Yunnan, mother plants are planted in March, and preparations for removing and replanting the mother plants are carried out in early December. Within a production cycle of 9 months, the output of qualified seed strips can reach 80-120 strips per plant, and the method is easy to promote and apply.

[0033] Compared with the prior art, the present invention first reduces the size of the standard seed strips, thereby reducing the lignification of the seed strips and avoiding the hollowing of the seed strips. It is easier to produce callus tissue during the rooting stage, and the rooting rate is higher.

[0034] The invention constructs a low and plump dahlia mother plant type through a double pinching technique and standardized seed strip harvesting operation, improves the internal ventilation and light conditions of the mother plant by trimming old leaves, promotes an increase in the leaf axil germination rate, and makes the nutrient buds grow quickly and robustly, thereby greatly improving the output and quality of effective seed strips.

[0035] The invention completely solves the problem of flower bud differentiation of the mother plant by adjusting the illumination time of the mother plant, greatly improves the qualified rate of seed strips, and successfully achieves the year-round production of qualified dahlia potted seedlings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a picture before harvesting using the method of the present invention;

[0037] Figure 2 A picture that has been retouched using the method of the present invention;

[0038] Figure 3 This is a picture after harvesting using the method of the present invention;

[0039] Figure 4 This is a partial picture after harvesting using the method of the present invention. DETAILED DESCRIPTION

[0040] The present invention is described in further detail below with reference to the embodiments.

[0041] Those skilled in the art will understand that the following examples are intended to illustrate the present invention only and should not be construed as limiting the scope of the present invention. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in the literature in the art or in the product specifications were used. Materials or equipment used without manufacturer identification are commercially available conventional products.

[0042] Example 1

[0043] A method for controlling the plant type of a potted dahlia female plant comprises the following steps:

[0044] Step (1), planting: Select a robust potted dahlia mother plant seedling with a height of 8 cm and 4 mature leaves, and plant it in a potted seedling bed; the substrate is a mixture of peat soil and perlite with a volume ratio of 6:4 (20-40 nm);

[0045] Step (2), pinching once: When the seedlings planted in step (1) grow to 8 mature leaves, pinch the seedlings once:

[0046] Step (3), secondary pinching: when the plant after the first pinching treatment in step (2) sprouts 5-6 lateral buds and the lateral buds grow to 4 mature leaves, a second pinching treatment is performed;

[0047] Step (4), harvesting seed strips: when the nutrient buds on the plants treated in step (3) grow to 4 mature leaves, leave a pair of mature leaves from the bottom of the nutrient buds upwards, and harvest the upper part of the pair of mature leaves as seed strips; harvest the seed strips every 4 days, and pre-cool the harvested seed strips;

[0048] During the entire production process, the lighting time is required to be no less than 16 hours.

[0049] Example 2

[0050] A method for controlling the plant type of a potted dahlia female plant comprises the following steps:

[0051] Step (1), planting: Select a robust potted dahlia mother plant seedling with a height of 8 cm and 4 large leaves, and plant it in a potted seedbed; the substrate is a mixture of peat soil and perlite with a volume ratio of 6:4 (20-40 nm);

[0052] Step (2), pinching once: When the seedlings planted in step (1) grow to 8 mature leaves, pinch the seedlings once:

[0053] Step (3), secondary pinching: when the plant after the first pinching treatment in step (2) sprouts 5-6 lateral buds and the lateral buds grow to 4 mature leaves, a second pinching treatment is performed;

[0054] Step (4), harvesting seed strips: when the nutrient buds on the plants treated in step (3) grow to 4 mature leaves, leave a pair of mature leaves from the bottom of the nutrient buds upwards, and harvest the upper part of the pair of mature leaves as seed strips; harvest the seed strips every 4 days, and pre-cool the harvested seed strips;

[0055] During the entire production process, the lighting time is required to be no less than 16 hours.

[0056] In step (1), the height of the potted seedling bed is 0.65m, and the pot type is a 210mm diameter two-color pot, with black inside and red outside, 1 plant / pot, and the pot placement density is 16 pots / m 2 .

[0057] In step (2), the specific method of the one-time pinching treatment is: leave 6 mature leaves on the plant from bottom to top, break off the stem at the node between the third and fourth pairs of leaves, and remove the top part.

[0058] In step (3), the specific method of the secondary pinching treatment is: leaving one mature leaf on the upper lateral bud of the plant from bottom to top and performing the topping treatment.

[0059] If the plant after the treatment in step (2) sprouts 2 to 4 lateral buds, and the lateral buds grow unevenly, when the top bud among the lateral buds grows to 4 leaves, the top bud is removed with one pair of mature leaves left; the other lateral buds are removed with one pair of mature leaves left as the second pinching.

[0060] In step (4), the time from harvesting the seed strips to sending them to the pre-cooling room should not exceed 1 hour, and the pre-cooling temperature should be 8°C.

[0061] In step (4), the quality standards for harvesting seed strips are as follows: the seed strips are 2-3 cm in length, have one pair of mature leaves and one pair of heart leaves, no flower buds, no diseased leaves, and the leaves are normal and smooth without spots.

[0062] During the entire production process, the optimal lighting time is 19 hours / day.

[0063] When the crown width of the plant reaches 14 cm, leave 2 cm of petiole at the base of the leaves and trim the mature old leaves. The frequency of trimming mature leaves is once a month.

[0064] Example 3

[0065] A method for controlling the plant type of a potted dahlia female plant comprises the following steps:

[0066] Step (1), planting: Select a robust potted dahlia mother plant seedling with a height of 8 cm and 4 large leaves, and plant it in a potted seedbed; the substrate is a mixture of peat soil and perlite with a volume ratio of 6:4 (20-40 nm);

[0067] Step (2), pinching once: When the seedlings planted in step (1) grow to 8 mature leaves, pinch the seedlings once:

[0068] Step (3), secondary pinching: when the plant after the first pinching treatment in step (2) sprouts 5-6 lateral buds and the lateral buds grow to 4 mature leaves, a second pinching treatment is performed;

[0069] Step (4), harvesting seed strips: when the nutrient buds on the plants treated in step (3) grow to 4 mature leaves, leave a pair of mature leaves from the bottom of the nutrient buds upwards, and harvest the upper part of the pair of mature leaves as seed strips; harvest the seed strips every 4 days, and pre-cool the harvested seed strips;

[0070] During the entire production process, the lighting time is required to be no less than 16 hours.

[0071] In step (1), the height of the potted seedling bed is 0.65m, and the pot type is a 210mm diameter two-color pot, with black inside and red outside, 1 plant / pot, and the pot placement density is 16 pots / m 2 .

[0072] In step (2), the specific method of the one-time pinching treatment is: leave 6 mature leaves on the plant from bottom to top, break off the stem at the node between the third and fourth pairs of leaves, and remove the top part.

[0073] In step (3), the specific method of the secondary pinching treatment is: leaving two mature leaves on the upper lateral buds of the plant from bottom to top and performing the topping treatment.

[0074] If the plant after the treatment in step (2) sprouts 2 to 4 lateral buds, and the lateral buds grow unevenly, when the top bud among the lateral buds grows to 4 leaves, the top bud is removed with one pair of mature leaves left; the other lateral buds are removed with two pairs of mature leaves left as the second pinching.

[0075] In step (4), the time from harvesting the seed strips to sending them to the pre-cooling room should not exceed 1 hour, and the pre-cooling temperature should be 8-10°C.

[0076] In step (4), the quality standards for harvesting seed strips are as follows: the seed strips are 2-3 cm in length, have one pair of mature leaves and one pair of heart leaves, no flower buds, no diseased leaves, and the leaves are normal and smooth without spots.

[0077] During the entire production process, the optimal lighting time is 19 hours / day.

[0078] When the crown width of the plant reaches 18 cm, leave 2 cm petioles at the base of the leaves and trim the mature old leaves. The frequency of trimming mature leaves is 2 times / month.

[0079] Example 4

[0080] A method for controlling the plant type of a potted dahlia female plant comprises the following steps:

[0081] Step (1), planting: Select a robust potted dahlia mother plant seedling with a height of 8 cm and 4 large leaves, and plant it in a potted seedbed; the substrate is a mixture of peat soil and perlite with a volume ratio of 6:4 (20-40 nm);

[0082] Step (2), pinching once: When the seedlings planted in step (1) grow to 8 mature leaves, pinch the seedlings once:

[0083] Step (3), secondary pinching: when the plant after the first pinching treatment in step (2) sprouts 5-6 lateral buds and the lateral buds grow to 4 mature leaves, a second pinching treatment is performed;

[0084] Step (4), harvesting seed strips: when the nutrient buds on the plants treated in step (3) grow to 4 mature leaves, leave a pair of mature leaves from the bottom of the nutrient buds upwards, and harvest the upper part of the pair of mature leaves as seed strips; harvest the seed strips every 4 days, and pre-cool the harvested seed strips;

[0085] During the entire production process, the lighting time is required to be no less than 16 hours.

[0086] In step (1), the height of the potted seedling bed is 0.65m, and the pot type is a 210mm diameter two-color pot, with black inside and red outside, 1 plant / pot, and the pot placement density is 16 pots / m 2 .

[0087] In step (2), the specific method of the one-time pinching treatment is: leave 6 mature leaves on the plant from bottom to top, break off the stem at the node between the third and fourth pairs of leaves, and remove the top part.

[0088] In step (3), the specific method of the secondary pinching treatment is: leaving 1-2 mature leaves on the upper lateral buds of the plant from bottom to top, and performing the topping treatment.

[0089] If the plant after the treatment in step (2) sprouts 2 to 4 lateral buds, and the lateral buds grow unevenly, when the top bud among the lateral buds grows to 4 leaves, the top bud is removed with one pair of mature leaves left; the other lateral buds are removed with 1 to 2 pairs of mature leaves left as the second pinching.

[0090] In step (4), the time from harvesting the seed strips to sending them to the pre-cooling room should not exceed 1 hour, and the pre-cooling temperature should be 8-10°C.

[0091] In step (4), the quality standards for harvesting seed strips are as follows: the seed strips are 2-3 cm in length, have one pair of mature leaves and one pair of heart leaves, no flower buds, no diseased leaves, and the leaves are normal and smooth without spots.

[0092] During the entire production process, the optimal lighting time is 19 hours / day.

[0093] When the crown width of the plant reaches 14-18 cm, leave 2 cm petiole at the base of the leaves and trim the mature leaves. The frequency of trimming mature leaves is 2 times / month.

[0094] Example 5

[0095] A method for controlling the plant type of a potted dahlia female plant comprises the following steps:

[0096] Step (1), planting: Select a robust potted dahlia mother plant seedling with a height of 8 cm and 4 mature leaves, and plant it in a potted seedling bed; the substrate is a mixture of peat soil and perlite with a volume ratio of 6:4 (20-40 nm);

[0097] Step (2), pinching once: When the seedlings planted in step (1) grow to 8 mature leaves, pinch the seedlings once:

[0098] Step (3), secondary pinching: when the plant after the first pinching treatment in step (2) sprouts 5-6 lateral buds and the lateral buds grow to 4 mature leaves, a second pinching treatment is performed;

[0099] Step (4), harvesting seed strips: when the nutrient buds on the plants treated in step (3) grow to 4 mature leaves, leave a pair of mature leaves from the bottom of the nutrient buds upwards, and harvest the upper part of the pair of mature leaves as seed strips; harvest the seed strips every 4 days, and pre-cool the harvested seed strips;

[0100] During the entire production process, the lighting time is required to be no less than 16 hours.

[0101] In step (1), the height of the potted seedling bed is 0.65m, and the pot type is a 210mm diameter two-color pot, with black inside and red outside, 1 plant / pot, and the pot placement density is 16 pots / m 2 .

[0102] In step (2), the specific method of the one-time pinching treatment is: leave 6 mature leaves on the plant from bottom to top, break off the stem at the node between the third and fourth pairs of leaves, and remove the top part.

[0103] In step (3), the specific method of the secondary pinching treatment is: leaving two mature leaves on the upper lateral buds of the plant from bottom to top and performing the topping treatment.

[0104] If the plant after the treatment in step (2) sprouts 2 to 4 lateral buds, and the lateral buds grow unevenly, when the top bud among the lateral buds grows to 4 leaves, the top bud is removed with one pair of mature leaves left; the other lateral buds are removed with one pair of mature leaves left as the second pinching.

[0105] In step (4), the time from harvesting the seed strips to sending them to the pre-cooling room should not exceed 1 hour, and the pre-cooling temperature should be 8-10°C.

[0106] In step (4), the quality standards for harvesting seed strips are as follows: the seed strips are 2-3 cm in length, have one pair of mature leaves and one pair of heart leaves, no flower buds, no diseased leaves, and the leaves are normal and smooth without spots.

[0107] During the entire production process, the optimal lighting time is 19 hours / day.

[0108] When the crown width of the plant reaches 16 cm, leave 2 cm of petiole at the base of the leaves and trim the mature leaves. The frequency of trimming mature leaves is 2 times / month.

[0109] Comparative Example 1

[0110] If the mature old leaves are not repaired during the test (i.e., in step (4), when the crown width of the mother plant reaches 14-18 cm, 2 cm petioles are left at the base of the leaves, and the mature leaves are trimmed, mainly the mature leaves inside the crown width, and the mature leaves outside the crown width can be retained for photosynthesis to achieve the effect of ventilation and light inside the crown width. The frequency of repairing large leaves is 1-2 times / month.), the other methods are the same as those in Example 4 of the present invention. Since the leaf area of dahlia is large and the number of leaves is large, the old leaves will seriously affect the light of the newly grown nutrient buds in the leaf axils. The 1st and 2nd internodes of the seed strips grown under weak light will be significantly elongated, and the internodes of the seed strips will be thin and soft, making it difficult to insert into the cutting medium during cutting, and thus discarded; in serious cases, the seed strips do not meet the seed strip stem thickness standard directly, and the strips are discarded on the cutting site. The yield rate of qualified seed strips is reduced by more than 15% compared with the standard mother plant type control. Moreover, if the mother plant cuttings are harvested in this way for a long time, the crown width of the mother plant will increase, the lower stem nodes will not be strong enough and will fall over, and the quality of the cuttings will be more seriously affected.

[0111] Comparative Example 2

[0112] If 5 pairs of leaves are left when pinching once during the test, 2 pairs of leaves are left when pinching twice, and 2 pairs of leaves are left when the formal seed strips are harvested, and the other methods are the same as those in Example 4 of the present invention, the mother plant will fall over 3 months after planting due to the excessive growth of the mother plant. Since the mother plant produces too many strips, the quality of the seed strips is seriously affected, mainly because there are more weak strips and jointing strips, and the qualified seed strip rate is less than 50%.

[0113] Comparative Example 3

[0114] If 3 pairs of leaves are left during the first pinching, 1 pair of leaves is left during the second pinching, and 2 pairs of leaves are left when the formal seed strips are harvested, and the rest is the same as the method in Example 4 of the present invention, the germination rate of the vegetative buds of the mother plant will be high 4 months after planting, exceeding the load of the mother plant, thereby causing the quality of the seed strips to decline or the mother plant to fall over, seriously affecting the output of qualified seed strips of the mother plant in the later stage, and the qualified seed strip rate is lower than 70%.

[0115] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling the plant type of a potted dahlia female plant, characterized in that: The steps include: Step (1), planting: Select a robust potted dahlia mother plant seedling with a height of 8 cm and 4 mature leaves, and plant it in a potted seedling bed; the substrate is a mixture of peat soil and perlite with a volume ratio of 6:4 (20-40 nm); Step (2), pinching once: When the seedlings planted in step (1) grow to 8 mature leaves, pinch the seedlings once: Step (3), secondary pinching: when the plant after the first pinching treatment in step (2) sprouts 5-6 lateral buds and the lateral buds grow to 4 mature leaves, a second pinching treatment is performed; Step (4), harvesting seed strips: when the nutrient buds on the plants treated in step (3) grow to 4 mature leaves, leave a pair of mature leaves from the bottom of the nutrient buds upwards, and harvest the upper part of the pair of mature leaves as seed strips; harvest the seed strips every 4 days, and pre-cool the harvested seed strips; During the entire production process, the optimal light duration is 19 hours per day; The specific method of the one-time topping treatment is: leaving 6 mature leaves on the plant from bottom to top, breaking off the stem at the node between the third and fourth pairs of leaves, and removing the top part; The specific method of the secondary pinching treatment is: leaving 1-2 mature leaves on the lateral buds of the plant from bottom to top and performing the topping treatment; The time from harvesting the seed strips to sending them to the pre-cooling room should not exceed 1 hour, and the pre-cooling temperature should be 8-10℃; When the crown width of the dahlia plant reaches 14-18 cm, leave 2 cm of petiole at the base of the leaves and remove the mature leaves of the entire plant in batches. The frequency of removing mature leaves is 1-2 times / month.

2. The method for controlling the plant type of the potted dahlia female parent according to claim 1, wherein: In step (1), the height of the potted seedling bed is 0.65m, and the pot type is a 210mm diameter two-color pot, with black inside and red outside, 1 plant / pot, and the pot placement density is 16 pots / m 2 .

3. The method for controlling the plant type of the potted dahlia female parent according to claim 1, wherein: If the plant after the treatment in step (2) sprouts 2 to 4 lateral buds, and the lateral buds grow unevenly, when the top bud among the lateral buds grows to 4 leaves, the top bud is removed, leaving a pair of mature leaves; Leave 1-2 pairs of mature leaves on other side buds and remove the tops as the second pinching.

4. The method for controlling the plant type of the potted dahlia female parent according to claim 1, wherein: In step (4), the quality standards for harvesting seed strips are as follows: the seed strips are 2-3 cm in length, have one pair of mature leaves and one pair of heart leaves, no flower buds, no diseased leaves, and the leaves are normal and smooth without spots.

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