A method for cultivating transplanted rape seedlings with prolonged seedbed waiting period

Abstract

The application discloses a rape transplanting seedling cultivation method for prolonging a seedbed waiting period, and comprises the following steps: S1, filling nutrient soil into hole holes of a plug tray, so that the soil surface is flush with the hole hole plane; S2, sowing rape seeds in the middle of the hole holes, two seeds per hole, and watering after sowing; S3, after cotyledon of the rape seedlings is unfolded, thinning seedlings to one seedling per hole; S4, in seedling period management, controlling seedling growth through water and fertilizer; and S5, transplanting after a field is prepared. The rape transplanting seedling cultivated by the method is more flexible, can meet the requirements of different transplanting times of a planter, and can resist abnormal climate, so that the rape seedling is alive and grows fast after transplanting, and a basis is laid for high yield and stable yield of rape seeds in the next year.

Description

Technical Field

[0001] This invention relates to the field of rapeseed cultivation technology, specifically to a method for cultivating rapeseed transplanted seedlings that extends the seedbed waiting period. Background Technology

[0002] Rapeseed is an important oilseed crop in my country, and rapeseed oil is a traditional edible oil and the largest source of domestically produced edible vegetable oil. Therefore, ensuring high and stable rapeseed yields is a crucial task that current rapeseed cultivation technology research needs to address. The Yangtze River Basin is a world-renowned winter rapeseed growing area and my country's most important rapeseed producing region. There are two main rapeseed planting methods in the Yangtze River Basin: direct seeding and transplanting. In recent years, simplified rapeseed cultivation techniques have developed rapidly, and the area of ​​direct-seeded rapeseed has been continuously expanding. However, rapeseed planting through transplanting still exists. Statistics show that 30% to 40% of the rapeseed planting area cannot be directly sown due to crop rotation or climatic conditions, and must be planted using seedling transplanting. Conversely, in some areas of the middle and lower reaches of the Yangtze River, direct seeding instead of planting when appropriate results in a rapeseed yield reduction of more than 30%. Therefore, it is foreseeable that rapeseed planting through transplanting will continue to exist for a long time to come.

[0003] When transplanting rapeseed, seedling raising is the most basic step. Under normal climatic conditions, seedlings in the lower reaches of the Yangtze River are typically raised from late September to early October, and transplanted into the field after about a month of growth. The rapeseed transplanting period coincides with a period of fluctuating temperatures, and coupled with the increasing uncertainties caused by global climate change in recent years, this period is highly susceptible to adverse weather conditions.

[0004] In recent years, the rapeseed transplanting season in the lower reaches of the Yangtze River has been plagued by abnormal weather, preventing rapeseed seedlings from being transplanted to the fields in a timely manner, significantly impacting rapeseed yields the following year. For example, in 2014, rain during the rice harvest delayed the harvest by a week, requiring rapeseed planting to be delayed by more than half a month. By then, winter had arrived, and the rapeseed seedlings did not have enough time to establish themselves. In 2015, heavy rain during the rapeseed transplanting season resulted in excessively high moisture content in the fields, making transplanting impossible. In the autumn of 2016, prolonged overcast and rainy weather in the lower reaches of the Yangtze River also made it impossible to prepare the fields. In all these cases, rapeseed seedlings in the seedbeds could not be transplanted to the fields in a timely manner. Even if transplanting was forced, the optimal planting period had passed, and temperatures had dropped. The result was either that the seedlings in the seedbeds became leggy due to the long wait, or that the low temperatures after transplanting caused slow seedling growth before winter, ultimately leading to insufficient biomass of rapeseed before winter, resulting in no yield or a sharp reduction in yield the following year, severely impacting rapeseed production. Against this backdrop, cultivating rapeseed transplant seedlings with an exceptionally long seedbed waiting period is an important method for solving current production problems. No relevant research has been publicly reported in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to address the current predicament in which rapeseed seedlings cannot be transplanted into the field in time during the suitable planting period, or even if they are forced to enter the field, they cannot grow normally. In order to solve this problem, a method for cultivating rapeseed transplant seedlings with an extended seedbed waiting period is proposed, which can cultivate rapeseed transplant seedlings with an extra-long seedbed waiting period.

[0006] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0007] A method for cultivating rapeseed transplant seedlings with extended seedbed waiting period includes the following steps:

[0008] S1: Fill the holes in the seed tray with nutrient soil, making the soil surface flush with the plane of the hole.

[0009] S2: Sow two rapeseed seeds in the center of each hole in the seed tray, and water after sowing;

[0010] S3: After the cotyledons of the rapeseed seedlings have fully expanded, thin them to one seedling per hole;

[0011] S4: Regulate seedling growth through water and fertilizer management during the seedling stage;

[0012] S5: Transplanting will be carried out after the field is ready.

[0013] To optimize the above technical solution, the specific measures also include:

[0014] The nutrients provided by the nutrient soil can support the rapeseed seedlings to grow normally to the three-leaf stage. At the same time, by limiting the amount of nutrients, the rapid growth of the seedlings is inhibited, so that the seedlings will have a nutrient deficiency after they have grown to a certain extent, and then artificial intervention is carried out under the nutrient deficiency state.

[0015] Furthermore, the method of artificial intervention is as follows:

[0016] When there is a relatively small nutrient deficiency, the seedlings are encouraged to grow as much of their underground parts as possible, resulting in a large number of roots.

[0017] When there is a relatively large nutrient deficiency, artificial nutrient solution is provided to ensure its normal growth.

[0018] Furthermore, the nutrient soil contains ≥35% organic matter and 3-5% total nitrogen, phosphorus and potassium.

[0019] Furthermore, the acupuncture plate is a 50-hole acupuncture plate; in the acupuncture plate, the length, width, and depth of the holes are all 4-6 cm.

[0020] Preferably, the bottom of the seedling tray is covered with a flexible, breathable medium that does not contain plant nutrients.

[0021] The flexible, breathable medium that does not contain plant nutrients is selected from non-woven fabric or linen.

[0022] Preferably, the method of regulating seedling growth through water and fertilizer during seedling management specifically includes:

[0023] Before the seedlings reach the three-leaf stage, observe the humidity of the planting hole every evening. If the surface soil of the hole has dried, water thoroughly.

[0024] When seedlings show visible signs of chlorosis in their true leaves, apply a compound fertilizer solution by spraying.

[0025] Specifically, the thorough watering refers to watering with a sprinkler belt for 1.5 to 2.5 hours.

[0026] Specifically, the compound fertilizer solution is an aqueous solution of compound fertilizer with a mass fraction of 0.08-0.15%; in the compound fertilizer, the N content is 22-27% w / w, the P content is 8-12% w / w, and the K content is 8-12% w / w.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] This invention provides a method for cultivating rapeseed transplant seedlings with an extended seedbed waiting period. This method can cultivate rapeseed transplant seedlings with an extra-long seedbed waiting period, thus extending the suitable planting period for rapeseed transplant seedlings. This alleviates the predicament of rapeseed seedlings not being transplanted into the field in time during the suitable planting period, or even if they are forced to enter the field, they cannot grow normally. At the same time, the seedlings can grow rapidly after transplanting and form a large biomass before winter, thereby ensuring a normal rapeseed yield in the following year as much as possible.

[0029] The rapeseed seedlings cultivated by this method appear relatively "mature and robust" above ground, with thick and tough root necks and about four leaves each. The underground root system is very well developed, with many dense fibrous roots in addition to the taproot. Some roots extend out of the water intake hole, while the fibrous roots tightly hold the nutrient soil in the hole.

[0030] Compared with rapeseed transplant seedlings cultivated in the conventional way, rapeseed transplant seedlings cultivated using this method can make rapeseed transplanting more flexible, meet the requirements of growers for different transplanting times, and resist abnormal weather, thus ensuring that the seedlings survive quickly after transplanting and grow rapidly, laying the foundation for high and stable rapeseed yields in the following year. Detailed Implementation

[0031] The present invention will be further described in detail below through specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All technologies implemented based on the above content of the present invention fall within the scope of the present invention.

[0032] This invention provides a method for cultivating rapeseed transplant seedlings to extend the seedbed waiting period, comprising the following steps:

[0033] S1: Fill the holes in the seed tray with nutrient soil, making the soil surface flush with the plane of the hole.

[0034] S2: Sow two rapeseed seeds in the center of each hole in the seed tray, and water after sowing;

[0035] S3: After the cotyledons of the rapeseed seedlings have fully expanded, thin them to one seedling per hole;

[0036] S4: Regulate seedling growth through water and fertilizer management during the seedling stage;

[0037] S5: Transplanting will be carried out after the field is ready.

[0038] In some embodiments, the rapeseed seeds are preferably clean and of high purity.

[0039] The nutrients provided by the potting soil can support the rapeseed seedlings to grow normally to the three-leaf stage, while the restriction of nutrients inhibits the rapid growth of the seedlings.

[0040] This is a core aspect of the invention: the nutrient soil provides seedlings with a basic amount of nutrients for growth. This basic amount of nutrients is limited, allowing the seedlings to grow normally for a period of time (generally supporting them until the three-leaf stage), while also limiting excessive and rapid growth. The aim is to create a nutrient deficiency in the seedlings after they have achieved a certain amount of growth, facilitating artificial intervention under these conditions.

[0041] The intervention methods are as follows:

[0042] When there is a slight nutrient deficiency, it can promote the seedlings to grow as much as possible in the underground part, producing a large number of roots, especially fibrous roots.

[0043] When there is a significant nutrient deficiency, artificial nutrient solution can be provided to ensure its normal growth.

[0044] The basic nutrient content of the potting soil is controlled by combining the nutrient content in the potting soil with the amount of potting soil in the seedling tray holes:

[0045] In some embodiments, the nutrient soil in step S1 has an organic matter content of ≥35% and a total nitrogen, phosphorus and potassium content of 3-5%.

[0046] In some implementations, 50-cell seedling trays are used as a support for the nutrient soil for seedling cultivation; as an example without limitation, the seedling tray is 55cm long and 28cm wide.

[0047] In some implementations, the length, width, and depth of the holes in the seedling tray are all 4 to 6 cm, and this volume of nutrient soil can provide the basic nutrients for seedling growth.

[0048] In some implementations, watering after sowing in step S2 is done using a sprinkler system.

[0049] In some embodiments, the bottom of the seedling tray is covered with a flexible, breathable medium that does not contain plant nutrients. This is also a core aspect of the present invention. While controlling the basic nutrient content of the potting soil, it is essential to ensure that the bottom of the seedling tray is a nutrient-free medium. This prevents the rapeseed seedling roots from being unable to absorb nutrients from other sources. This design serves two purposes:

[0050] (1) Ensure that the seedlings in the plug tray can only absorb nutrients from the nutrient soil in the plug tray, and that the nutrients in the plug tray can ensure that the seedlings grow normally in the early stage (about before the three-leaf stage).

[0051] (2) The nutrients in the seedling tray may be insufficient in the later stage of seedling growth. This has two consequences: first, it ensures that the above-ground part of the seedling will not grow too vigorously; second, it stimulates the growth of its underground root system, so that the seedling has a large root reserve. Once transplanted into the field, it can quickly and efficiently absorb water and nutrients from the field, thus enabling it to grow rapidly.

[0052] Preferably, the flexible, breathable medium that does not contain plant nutrients is selected from nonwoven fabric or linen.

[0053] Another key aspect of this invention lies in water and fertilizer control, specifically regulating seedling growth through water and fertilizer management during the seedling stage.

[0054] Before the seedlings reach the three-leaf stage, observe the humidity of the planting hole every evening. If the surface soil of the hole has dried, water thoroughly.

[0055] When seedlings show visible signs of chlorosis in their true leaves, apply a compound fertilizer solution by spraying.

[0056] Thorough watering refers to watering with sprinkler tape for 1.5 to 2.5 hours. As an example without limitation, watering with sprinkler tape for 2 hours is used, with sprinkler parameters of inlet water pressure of 0.1 MPa and sprinkler tape orifice diameter of 1 mm.

[0057] The compound fertilizer solution is an aqueous solution of compound fertilizer with a mass fraction of 0.08–0.15%; in the compound fertilizer, the N content is 22–27% w / w, the P content is 8–12% w / w, and the K content is 8–12% w / w. As an example without limitation, a 0.1% compound fertilizer solution (N content 25%, P content 10%, K content 10%) is sprayed until visible water is visible on the surface of the soil in the planting hole.

[0058] The rapeseed seedlings cultivated by this method appear relatively "mature and robust" above ground, with thick and tough root necks and about four leaves each. The underground root system is very well developed, with many dense fibrous roots in addition to the taproot. Some roots extend out of the water intake hole, while the fibrous roots tightly hold the nutrient soil in the hole.

[0059] When removing the seedlings, you can easily lift the above-ground part by hand to remove all the seedlings with soil for transplanting. This type of seedling has several advantages:

[0060] (1) It has an extraordinary seedbed waiting period, a wide range of suitable planting periods, and only simple watering is needed in the later stages;

[0061] (2) After transplanting to the field, the seedlings can quickly survive and grow, and obtain the maximum growth before the overwintering period;

[0062] (3) It can cope with situations where transplanting cannot be carried out in a timely manner due to abnormal weather;

[0063] (4) It occupies a small area and is easy to select a site, making it very suitable for small plots of land within 3 mu.

[0064] Therefore, compared with rapeseed transplant seedlings cultivated in the general way, rapeseed transplant seedlings cultivated using this method can make rapeseed transplanting work more flexible, basically without time restrictions, and can withstand abnormal weather, thus ensuring that the seedlings survive quickly after transplanting and grow rapidly, laying the foundation for high and stable rapeseed yields in the following year.

[0065] The technical solution of the present invention will be further described in detail below with reference to specific embodiments:

[0066] Example 1

[0067] Open the bag of newly purchased potting soil, lay the seedling tray flat, and use a shovel to fill the seedling holes with potting soil. Gently tamp the soil down so that the soil surface is flush with the surface of the seedling hole.

[0068] Select clean, high-purity rapeseed seeds and sow them in 50-cell trays (55cm long, 28cm wide; each cell is 5cm long, wide, and deep), with two seeds per cell. When sowing, try to place the seeds in the center of the tray to make the most of the space for the seedlings to grow.

[0069] After sowing, cover the entire seed tray with a 1-3 mm thick layer of nutrient soil (organic matter content of 35-100%, total nitrogen, phosphorus and potassium content of 3-5%), and then water with sprinkler irrigation for 2 hours. The sprinkler irrigation parameters are: water inlet pressure of 0.1 MPa and sprinkler tape orifice diameter of 1 mm.

[0070] After about 5 to 7 days, the seeds will have basically germinated. Once the cotyledons of the seedlings have fully expanded, immediately thin them to one seedling per hole. Do not pull the seedlings out by hand when thinning, so as not to affect the growth of the remaining seedlings. Since the seedlings are tender at this time, you can simply pinch off the above-ground part by hand.

[0071] Seedling management is carried out through water and fertilizer control. When the true leaves of the seedlings show obvious signs of chlorosis visible to the naked eye after the three-leaf stage, a 0.1% compound fertilizer solution (25% N, 10% P, and 10% K) is sprayed on them.

[0072] Once the field is ready, transplant the seedlings from the seedbeds. When transplanting, simply pull the above-ground part of the seedling with your hand to easily remove the whole seedling. In the field, just dig a small hole, put the seedling in, and cover the roots with soil and compact it.

[0073] Example 2

[0074] Rapeseed transplant seedlings were cultivated using the method described in Example 1 for three consecutive years in the autumn of 2022, 2023, and 2024. The specific implementation steps are as follows:

[0075] (1) Open the bag of newly purchased nutrient soil and do not add any other fertilizer; lay the seed tray flat and use a shovel to fill the seed tray with nutrient soil into the seed holes, gently pat it down so that the soil surface is flush with the seed hole surface.

[0076] (2) Select clean and pure rapeseed seeds and sow them in 50-cell trays (55cm long and 28cm wide; the length, width and depth of each cell are 5cm), with two seeds per cell; when sowing, try to place the seeds in the middle of the tray to make the most of the space for the seedlings to grow; after sowing, cover the entire tray with a layer of nutrient soil about 2mm thick (40% organic matter content and 4% total nitrogen, phosphorus and potassium content); use sprinkler irrigation for 2 hours at random, with the sprinkler parameters being an inlet water pressure of 0.1MPa and a sprinkler tape orifice diameter of 1mm;

[0077] (3) After about 5 to 7 days, the seeds will have basically finished germinating. After the cotyledons of the seedlings have unfolded, immediately thin them to one seedling per hole. Do not pull the seedlings out by hand when thinning, so as not to affect the growth of the remaining seedlings. Since the seedlings are tender at this time, you can just pinch off the above-ground part by hand.

[0078] (4) Seedling management through water and fertilizer control; when the seedlings show obvious chlorosis symptoms visible to the naked eye after the three-leaf stage, spray with a 0.1% compound fertilizer (N content 25%, P content 10%, K content 10%) solution, generally spraying N seedling trays with 1 kg of solution.

[0079] (5) Transplanting should be carried out after the field is ready; after the field is ready, the seedlings in the plug trays should be transplanted immediately; when transplanting, the whole seedling can be easily removed by gently pulling the above-ground part of the seedling with your hand. Only a small pit needs to be dug in the field. After the seedling is placed in the pit, the soil around the roots should be covered and compacted.

[0080] Example 3

[0081] This embodiment demonstrates the method of Example 2, with different hole sizes used for seedling cultivation.

[0082] Following the specific procedure of Example 2, seedling cultivation experiments were conducted using various procedures in plug trays. Seeds of the conventional strain 09N59 (Jiangsu Agricultural Sciences, 2016, 44(11):114-115) with a purity greater than 99% were selected as experimental materials. After sowing, transplanted seedlings were cultivated strictly according to the procedure, and the results are shown in Table 1.

[0083]

[0084] The comparison of data in Table 1 shows that:

[0085] The more holes a seedling tray has, the fewer green leaves a one-month-old seedling will have, and the shorter the seedling will be. Seedlings grown in trays with more than 72 holes will have fewer than four leaves at one month old, which is not conducive to the growth of seedlings after transplanting. However, seedlings with fewer than 50 holes, although larger, have low seedling efficiency, and can only grow 32 seedlings in the same size tray. Conversely, transplanting the same area of ​​field requires more seedling trays, more substrate, and higher costs. Therefore, a seedling tray with 50 holes is the best choice.

[0086] Example 4

[0087] This example compares seedling cultivation in 50-cell trays with seedling cultivation in open-air seedbeds.

[0088] The conventional strain 09N59 (Jiangsu Agricultural Sciences, 2016, 44(11):114-115) was selected and transplanted using 50-cell seedling trays and open-air seedbeds. Seedlings in the seedling trays were cultivated strictly according to the procedure in Example 2, while seedlings in the open-air seedbeds were cultivated according to the traditional seedling cultivation methods of the local planting population. After one month, the characteristics of the transplanted seedlings were compared, and the results are as follows:

[0089] Table 2 Comparison of characteristics of rapeseed seedlings (one month old) cultivated by two methods

[0090] Seedling height (cm) 5.0-6.0 15-20 Number of green leaves (pieces) 3.5-4.5 7-8 Main root length (cm) 4.5-5.0 10-13 fibrous roots Numerous and dense Fewer and shorter

[0091] The comparison of data in Table 2 shows that:

[0092] Compared to seedbed seedlings, plug seedlings have a smaller overall biomass. Seedbed seedlings have an advantage in terms of both above-ground height and underground root length. However, for transplanted seedlings, the larger biomass means that they need to be watered quickly and in large quantities before they take root after transplanting. Compared to plug seedlings, seedbed seedlings with fewer fibrous roots absorb soil moisture more slowly after transplanting and take longer to take root. Conversely, plug seedlings take root faster.

[0093] Example 5

[0094] This example compares the types of fertilizer supplementation during the seedling tray stage.

[0095] Following the procedure in Example 2, four types of fertilizer were used for foliar fertilization of plug seedlings before transplanting when they were deficient in nutrients: general-purpose compound fertilizer (nitrogen, phosphorus, and potassium ratio of 15:15:15), high-nitrogen compound fertilizer (nitrogen, phosphorus, and potassium ratio of 25:10:10), high-phosphorus compound fertilizer (nitrogen, phosphorus, and potassium ratio of 10:30:10), and high-potassium compound fertilizer (nitrogen, phosphorus, and potassium ratio of 10:10:20). The results showed that:

[0096] The duration of maintenance after spraying of the four fertilizers was 4 days, 6 days, 3 days and 3 days respectively, indicating that the high-nitrogen compound fertilizer has a good effect on maintaining the seedling fertilizer effect in the present invention.

[0097] Example 6

[0098] This example compares the suitable transplanting period for seedlings raised in 50-cell trays with that raised in open-air seedbeds.

[0099] Seedlings raised in 50-cell trays according to Example 2 and those raised in open seedbeds were transplanted at three different time points: normal planting date (October 30th), late planting date (November 15th), and very late planting date (November 30th). The results showed that:

[0100] When transplanted at the normal time, there is little difference between seedlings grown in plug trays and those grown in open seedbeds after transplanting, but plug tray seedlings survive 1-2 days faster than seedbed seedlings. In cases of late planting, seedbed seedlings may be transplanted with difficulty due to excessive growth, but survival is slow, while plug tray seedlings remain robust and survive normally. In cases of extremely late planting, seedbed seedlings can no longer be transplanted, while plug tray seedlings still have vigorous root systems and can be transplanted completely, growing normally after transplanting. Even at the low temperatures at the time (generally between 0-10℃), they can still survive normally. This sufficiently demonstrates that the plug tray seedlings of this invention have an extremely long seedbed waiting period. This invention solves this thorny technical problem, achieves significant technical effects, and can generate substantial economic benefits.

[0101] Comparative Example 7

[0102] The patent with publication number CN102907228A provides a method for cultivating rapeseed seedlings in a mat-like pattern. In this method, the rapeseed seedlings grow without gaps in order to make the roots overlap. However, the solution of this invention is to separate the seedlings. If the seedlings are too dense, they will restrain each other and cannot achieve the purpose of extending the seedbed waiting period of this application.

[0103] Comparative Example 8

[0104] The patent with publication number CN103597970A provides a seedling cultivation method to improve the success rate of transplanting machines. In this method, seedlings are transplanted as soon as they grow one true leaf, which is too early. However, the method of this invention does not transplant seedlings, in order to wait for the field to develop multiple leaves. The rapeseed transplanted seedlings cultivated by this method appear to be more robust and mature above ground, with thick and tough root necks and about four leaves. The underground root system is very well developed, with many and dense fibrous roots in addition to the taproot.

[0105] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for cultivating rapeseed transplanted seedlings with an extended seedbed waiting period, characterized in that, Includes the following steps: S1: Fill the holes in the seed tray with nutrient soil, making the soil surface flush with the plane of the hole. S2: Sow two rapeseed seeds in the center of each hole in the seed tray, and water after sowing; S3: After the cotyledons of the rapeseed seedlings have fully expanded, thin them to one seedling per hole; S4: Regulate seedling growth through water and fertilizer management during the seedling stage; S5: Transplanting will be carried out after the field is ready; In the aforementioned acupuncture tray, the length, width, and depth of the acupuncture holes are all 4-6 cm; the bottom of the acupuncture tray is covered with a flexible, breathable medium that does not contain plant nutrients. The flexible, breathable medium that does not contain plant nutrients is selected from non-woven fabric or linen. The aforementioned regulation of seedling growth through water and fertilizer during seedling management specifically includes: Before the seedlings reach the three-leaf stage, observe the humidity of the planting hole every evening. If the surface soil of the hole has dried, water thoroughly. When the true leaves of the seedlings show visible signs of chlorosis, a compound fertilizer solution is sprayed. The nutrients provided by the nutrient soil can support the rapeseed seedlings to grow normally to the three-leaf stage. At the same time, by limiting the amount of nutrients, the rapid growth of the seedlings is inhibited, so that the seedlings will have a nutrient deficiency after they have a certain amount of growth. Then, artificial intervention is carried out under the nutrient deficiency state. The aforementioned artificial intervention specifically refers to: When there is a relatively small nutrient deficiency, the seedlings are encouraged to grow as much of their underground parts as possible, resulting in a large number of roots. When there is a relatively large nutrient deficiency, artificial nutrient solution is provided to ensure its normal growth.

2. The method for cultivating rapeseed transplanted seedlings with extended seedbed waiting period according to claim 1, characterized in that: The compound fertilizer solution is an aqueous solution of compound fertilizer with a mass fraction of 0.08-0.15%; in the compound fertilizer, the N content is 22-27% w / w, the P content is 8-12% w / w, and the K content is 8-12% w / w.

3. The method for cultivating rapeseed transplanted seedlings with extended seedbed waiting period according to claim 1, characterized in that: The nutrient soil contains ≥35% organic matter and 3-5% total nitrogen, phosphorus and potassium.

4. The method for cultivating rapeseed transplanted seedlings with extended seedbed waiting period according to claim 1, characterized in that: The thorough watering mentioned refers to watering with a sprinkler belt for 1.5 to 2.5 hours.

Images