Paddy rice cultivation method adopting dense-sowing seedling raising and thin-planting of plantlets

Abstract

The invention provides a rice cultivation method for seedling raising through dense seeding in a bowl tray and seedling thin planting, and belongs to the technical field of crop cultivation. The cultivation method provided by the invention comprises the following steps of: raising rice seedlings by adopting a plastic pot tray, sowing 4-5 seeds in each pot hole, and growing 3-4 seedlings in each hole; after seedling raising, the seedlings are transplanted at the leaf age of 3.5-4.5 of the main stems of the seedlings, and the transplanting density is 0.6-0.8 million holes / 667 m < 2 >. According to the method, the area of a seedling raising field can be saved by more than 50%, the number of effective ears is increased by about 50%, the yield is increased by more than 20%, and the cost is saved and the yield is increased by more than 200 yuan / mu.

Description

Technical Field

[0001] The invention belongs to the technical field of crop cultivation, and in particular relates to a rice cultivation method using pot trays for dense seeding and sparse planting of small seedlings. Background Art

[0002] Rice is a major food crop in the world and is also grown on a large scale in hilly and mountainous areas. However, traditional rice cultivation technology has many obvious limitations. The main limitations are the transplanting of medium and large seedlings, with the main stem leaf age usually being 6-8 leaves; the transplanting density is at a relatively low level of 6,000-8,000 holes / 667m 2 Moreover, this "sparse and large nest" cultivation concept is deeply rooted and difficult to change; the planting method is mostly single or double seedlings planting. This traditional cultivation model has brought a series of serious problems.

[0003] First, due to the above-mentioned cultivation method, the number of basic rice seedlings is extremely small, only 10,000-20,000 / mu. Such a small number of basic seedlings makes it difficult for rice to form a good population structure in the early stage of growth, and it is impossible to make full use of natural conditions such as land resources and light, which greatly limits the growth potential of rice. Secondly, under this traditional cultivation method, the number of effective panicles is seriously insufficient, only about 100,000 / mu. The number of effective panicles is one of the key factors determining rice yield. The insufficient number of effective panicles directly leads to the difficulty in increasing the yield of rice. Finally, these problems work together to make the rice yield under traditional cultivation technology low, generally only 400-500kg / mu. In today's rapid development of modern agriculture, such a yield level is far from meeting people's demand for food, and it does not meet the pursuit of high yield and high efficiency in modern agriculture.

[0004] With the continuous advancement of agricultural science and technology and people's increasing requirements for food yield and quality, there is an urgent need for a new, practical and easy-to-accept rice cultivation method to break the bottleneck of traditional rice cultivation technology, effectively improve rice yield and quality, and contribute to promoting sustainable agricultural development. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a rice cultivation method with dense seeding in pots and trays and sparse planting of small seedlings, which can save the area of ​​rice seedling raising field, reduce production costs, increase the number of effective rice ears and improve yield without increasing transplanting density.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A rice cultivation method with dense seeding and sparse planting of rice seedlings in pot trays, wherein the rice seedlings are grown in plastic pot trays, 4-5 seeds are sown in each pot hole, and 3-4 seedlings are grown in each hole; after the seedlings are grown, the seedlings are transplanted when the main stem of the seedlings is 3.5-4.5 leaves old, and the transplanting density is 0.6-0.8 thousand holes / 667m 2 .

[0008] Preferably, the rice variety is a large-panicle rice variety.

[0009] More preferably, the rice variety is selected from Taiyou 808, Rong 18you 2348 or Xingliangyou 578.

[0010] Preferably, during the seedling raising period, a non-woven fabric or plastic film is covered, the temperature inside the film is 28-32°C during the seedling emergence period, the nutrient soil in the pot is kept moist before the 2-leaf stage, the film is removed and compound fertilizer is applied after 2 leaves and 1 heart, and then water and dry management are implemented, and grafting fertilizer is applied 2-3 days before transplanting.

[0011] Preferably, the transplanting is carried out by manual planting, seedling throwing or a pot seedling transplanter.

[0012] Preferably, the transplanting hole spacing is 33cm×26-30cm, one hole is transplanted in each pot hole, and the basic seedlings are 24,000-30,000 plants / 667m 2 .

[0013] Preferably, the method further comprises fertilization management: 11-13 kg / 667 m3 of nitrogen is applied during the whole growth period of the rice. 2 , applied according to mass proportion: base fertilizer: tillering fertilizer: ear fertilizer = 4:3:3.

[0014] More preferably, the fertilization management further includes applying KCl 7-9kg / 667m during the rice jointing period. 2 .

[0015] Preferably, water management is also included: "thin-dry-shallow-wet" is carried out, a thin water layer of 1-3 cm is maintained in the field when the seedlings are transplanted, and the field is exposed to the sun until the seedlings reach the critical leaf age for effective tillering, water is restored during the jointing period, a shallow water layer of 3-5 cm is maintained, and alternating dry and wet irrigation is maintained during the filling and fruiting period.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a rice cultivation method of dense seeding and small seedling sparse planting in pot trays, which changes the traditional manual sowing wet seedling raising or dry seedling raising into commercial plastic pot trays for assembly line pot tray raising, with 4-5 rice grains sown in each hole, and 3-4 seedlings cultivated in each pot hole, which is conducive to forming an advantage in the number of seedlings per hole when transplanting in a single hole and single pot, and improving the basic seedlings for transplanting. The traditional sparse planting of medium and large seedlings with a leaf age of 6-8 is further changed to sparse planting of medium and small seedlings with a leaf age of 3.5-4.5, which does not increase the labor intensity of transplanting, and at the same time reduces the competition phenomenon of rice seedling growth in the pot hole, and the transplanting of pot tray seedlings has no plant injury and no slow seedling period. After transplanting, the medium and small seedlings quickly grow and develop, and the tillering rate is increased, forming the advantages of sufficient ears and large ears in the group. The present invention can save more than 50% of the area of ​​seedling raising land, increase the number of effective ears by about 50%, increase the yield by more than 20%, and achieve cost saving and yield increase of more than 200 yuan per mu. DETAILED DESCRIPTION

[0018] The present invention provides a rice cultivation method using a pot tray for dense seeding and sparse planting of rice seedlings, comprising the following steps:

[0019] (1) Variety selection: In the present invention, the preferred rice variety is a large panicle rice variety, and more preferably the rice variety is selected from Taiyou 808, Rong 18you 2348 or Xingliangyou 578.

[0020] (2) Dense sowing in pot trays: In the present invention, rice is grown in plastic pot trays, 4-5 seeds are sown in each pot hole, and 3-4 seedlings are grown in each hole. As an implementation method, a 448-hole plastic pot tray is used for growing rice seedlings; a further preferred sowing procedure includes: sowing the bottom soil - sowing - covering the soil - sprinkling water, placing the tray on a flat bed surface, and laying fine-mesh gauze on the bed surface before placing the tray to prevent the roots from growing into the bottom bed soil, resulting in soil sticking to the bottom of the seedling tray when the tray is lifted. Immediately after placing the tray, irrigate once with flat ditch water, which will fade after half an hour.

[0021] (3) Seedling management: In the present invention, during the seedling raising period, preferably, a non-woven fabric or plastic film is covered with an arch, the temperature inside the film is 28-32°C during the seedling emergence period, more preferably 30°C, and the moisture content of the nutrient soil in the pot is maintained at 60%-85%, more preferably 70% before the 2-leaf stage; after 2 leaves and 1 heart, the film is removed and compound fertilizer is applied, more preferably the fertilizer amount is 4g / pot, and the nutrient content is N-P2O5-K2O=15-15-15, and pest control is more preferably carried out at the same time, using chloranil, bezoar, etc. , carbendazim and other pesticides are sprayed to prevent and control rice damping-off disease, seedling blight and rice stalk fly; afterwards, water drought management is implemented, and no water layer is seen in the nursery field and the tray, and the moisture content of the nutrient soil in the pot tray is maintained at 30%-50%, and more preferably at 40%; 2-3 days before transplanting, fertilizer is applied, and 2-4g of urea / pot tray is further preferably sprayed with water; preferably, water the seedlings moderately 1 day before transplanting, and more preferably, the moisture content of the nutrient soil in the pot tray is maintained at 60%-85%. Care should be taken to prevent damage to the seedlings when removing the tray, and the seedlings should be planted as soon as they are removed.

[0022] (4) Sparse planting of seedlings: In the present invention, the seedlings are transplanted when the main stem is 3.5-4.5 leaves old (seedling age is 25-30 days), preferably when the main stem is 4 leaves old; preferably, the transplanting is carried out by manual planting, seedling throwing or pot seedling transplanting machine; the transplanting density is 0.6-0.8 thousand holes / 667m 2 , preferably 7,000 holes / 667m 2 The optimal transplanting hole distance is 33cm×26-30cm, one hole is transplanted in each pot hole, and the basic seedlings are 24,000-30,000 plants / 667m 2 The optimal basic seedling is 27,000 plants / 667m 2 .

[0023] (5) Fertilizer management: In the present invention, it is preferred to apply 11-13 kg / 667 m3 of nitrogen during the entire growth period of rice. 2 , more preferably 12kg / 667m 2 , according to the mass fraction, the base fertilizer: tillering fertilizer: ear fertilizer = 4:3:3, more preferably: the base fertilizer is compound fertilizer (N-P2O5-K2O = 15-15-15), applied 1-2 days before transplanting, the tillering fertilizer is urea (content of 46%), applied 5-7 days after transplanting, and the ear fertilizer is urea (content of 46%), applied at the 4th leaf age. It is also preferred to apply KCl7-9kg / 667m during the jointing stage of rice. 2 , more preferably 8kg / 667m 2 .

[0024] (6) Water management: In the present invention, it is preferred to implement "thin-dry-shallow-wet". When transplanting seedlings, a thin water layer of 1-3 cm is maintained in the field, and 2 cm is more preferred. The field is exposed to the sun until the critical leaf age of effective tillering. Water is restored during the jointing stage, and a shallow water layer of 3-5 cm is maintained, and 4 cm is more preferred. Alternating dry and wet irrigation is maintained during the filling and fruiting period.

[0025] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0026] Example 1

[0027] A rice cultivation method using a pot tray with dense seeding and sparse planting of rice seedlings comprises the following steps:

[0028] (1) Variety selection: The rice variety is a large-panicle rice variety, specifically Taiyou 808.

[0029] (2) Intensive sowing in pot trays: Use 448-hole plastic pot trays produced by Changzhou Yamei Agricultural Machinery Equipment Co., Ltd. to raise seedlings. Sow with an assembly line seeder, sow 4-5 seeds in each hole, and ensure that 3-4 seedlings emerge in each hole. The sowing procedure is to sow the bottom soil-sow-cover the soil-sprinkle water, and place the trays on a flat surface. Spread fine-mesh gauze on the surface before placing the trays to prevent the roots from growing into the bottom soil and causing the bottom of the trays to stick to the soil when the trays are lifted. Immediately after placing the trays, irrigate with flat ditch water once, and drain it after half an hour.

[0030] (3) Management of seedling raising: Cover with plastic film. Keep the temperature inside the film at 30°C during the seedling emergence period. Keep the moisture content of the nutrient soil in the seedling tray at 70% before the 2-leaf stage. Apply 4g of compound fertilizer (N-P2O5-K2O=15-15-15) per tray when the seedlings have 2 leaves and 1 heart after removing the film. Carry out pest and disease control once. Use pesticides such as chloranil, carbendazim, and carbendazim to spray to control rice damping-off, seedling blight, and rice stalk fly. After that, implement water management in the seedling field. No water layer is seen in the seedling field and the tray. Keep the moisture content of the nutrient soil in the tray at 40%. Apply fertilizer 2-3 days before transplanting. Spray 3g of urea / tray with water. Water the seedlings properly one day before transplanting. Keep the moisture content of the nutrient soil in the tray at 70%. When removing the tray, care should be taken to prevent damage to the seedlings. Plant the seedlings as soon as they are removed.

[0031] (4) Sparse planting of small seedlings: When the main stem of the seedlings is 4 leaves old, use a seedling transplanter to transplant them, and the transplanting density is 7,200 holes / 667m 2 The hole distance is 33cm×28cm, and each pot hole is transplanted into one hole. The basic seedlings are controlled at 27,000 / 667m 2 .

[0032] (5) Fertilizer and water management: Apply pure nitrogen 12kg / 667m during the entire growth period 2 , basal fertilizer accounted for 40%, compound fertilizer (N-P2O5-K2O=15-15-15) was applied 2 days before transplanting, tillering fertilizer accounted for 30%, urea (content was 46%) was applied 6 days after transplanting, panicle fertilizer accounted for 30%, urea (content was 46%) was applied at the 4th leaf stage, and potassium fertilizer was applied once at the jointing stage of rice (the main stem internodes extended 2cm), KCl (content was 60%) 8kg / 667m 2 ; Water management is carried out according to the principle of "thin-dry-shallow-wet". A thin water layer of 2 cm is maintained in the field when transplanting rice seedlings. The field is exposed to the sun during the critical leaf age of effective tillering. A shallow water layer of 4 cm is maintained from the jointing and heading stage. Alternating dry and wet irrigation is maintained during the filling and fruiting period.

[0033] Example 2

[0034] A rice cultivation method using a pot tray with dense seeding and sparse planting of rice seedlings comprises the following steps:

[0035] (1) Variety selection: The rice variety is a large-panicle rice variety, specifically Rong 18 You 2348.

[0036] (2) Intensive sowing in pot trays: Use 448-hole plastic pot trays produced by Changzhou Yamei Agricultural Machinery Equipment Co., Ltd. to raise seedlings. Sow with an assembly line seeder, sow 4-5 seeds in each hole, and ensure that 3-4 seedlings emerge in each hole. The sowing procedure is to sow the bottom soil-sow-cover the soil-sprinkle water, and place the trays on a flat surface. Spread fine-mesh gauze on the surface before placing the trays to prevent the roots from growing into the bottom soil and causing the bottom of the trays to stick to the soil when the trays are lifted. Immediately after placing the trays, irrigate with flat ditch water once, and drain it after half an hour.

[0037] (3) Management of seedling raising: non-woven fabric was used for arching and covering. The temperature inside the film was 28°C during the seedling emergence period. The moisture content of the nutrient soil in the seedling tray was maintained at 60% before the 2-leaf stage. After the film was removed, 4 g of compound fertilizer (N-P2O5-K2O=15-15-15) was applied to each tray when the rice had 2 leaves and 1 heart. Disease and insect pest control was carried out once. The pesticides such as chloranil, carbendazim, and carbendazim were used for spraying to control rice damping-off disease, seedling blight, and rice stalk fly. After that, the seedling field was water-dry management. No water layer was seen in the seedling field and the tray. The moisture content of the nutrient soil in the tray was maintained at 30%. 2-3 days before transplanting, a fertilizer was applied. 2 g of urea was diluted with water and sprayed. One day before transplanting, water was properly irrigated to prevent damage to the seedlings. The seedlings were planted as soon as they were removed.

[0038] (4) Sparse planting of seedlings: When the main stem of the seedlings has 3.5 leaves, they are transplanted by hand, with a transplanting density of 7,800 holes / 667m 2 , row spacing 33cm, plant spacing 26cm, transplant one seedling per pot hole, basic seedlings controlled at 30,000 / 667m 2 .

[0039] (5) Fertilizer and water management: Apply pure nitrogen 13kg / 667m during the entire growth period 2 , basal fertilizer accounted for 40%, compound fertilizer (N-P2O5-K2O=15-15-15) was applied 2 days before transplanting, tillering fertilizer accounted for 30%, urea (content was 46%) was applied 5 days after transplanting, panicle fertilizer accounted for 30%, urea (content was 46%) was applied at the 4th leaf stage, and potassium fertilizer was applied once at the jointing stage of rice (the main stem internodes extended 2cm), KCl (content was 60%) 9kg / 667m 2 ; Water management is carried out according to the principle of "thin-dry-shallow-wet". A thin water layer of 1 cm is maintained in the field when transplanting rice seedlings. The field is exposed to the sun during the critical leaf age of effective tillering. A shallow water layer of 3 cm is maintained from the jointing and heading stage. Alternating dry and wet irrigation is maintained during the filling and fruiting period.

[0040] Example 3

[0041] A rice cultivation method using a pot tray with dense seeding and sparse planting of rice seedlings comprises the following steps:

[0042] (1) Variety selection: The rice variety used is a large-panicle rice variety, specifically Xingliangyou 578.

[0043] (2) Intensive sowing in pot trays: Use 448-hole plastic pot trays produced by Changzhou Yamei Agricultural Machinery Equipment Co., Ltd. to raise seedlings. Sow with an assembly line seeder, sow 4-5 seeds in each hole, and ensure that 3-4 seedlings emerge in each hole. The sowing procedure is to sow the bottom soil-sow-cover the soil-sprinkle water, and place the trays on a flat surface. Spread fine-mesh gauze on the surface before placing the trays to prevent the roots from growing into the bottom soil and causing the bottom of the trays to stick to the soil when the trays are lifted. Immediately after placing the trays, irrigate with flat ditch water once, and drain it after half an hour.

[0044] (3) Management of seedling raising: Cover with plastic film. Keep the temperature inside the film at 32°C during the seedling emergence period. Keep the moisture content of the nutrient soil in the seedling tray at 85% before the 2-leaf stage. Apply 4g of compound fertilizer (N-P2O5-K2O=15-15-15) per tray when the seedlings have 2 leaves and 1 heart after the film is removed. Carry out pest and disease control once. Use pesticides such as chloranil, carbendazim, and carbendazim to spray to control rice damping-off, seedling blight, and rice stalk fly. After that, implement water management in the seedling field. No water layer is seen in the seedling field and the tray. Keep the moisture content of the nutrient soil in the tray at 50%. Apply fertilizer 2-3 days before transplanting. Spray 4g of urea per tray with water. Water the seedlings properly one day before transplanting. Keep the moisture content of the nutrient soil in the tray at 85%. When removing the tray, care should be taken to prevent damage to the seedlings. Plant the seedlings as soon as they are removed.

[0045] (4) Sparse planting of seedlings: When the main stem of the seedlings has 4.5 leaves, transplant them by throwing them, with a transplanting density of 6,700 holes / 667m 2 , row spacing 33cm, plant spacing 30cm, transplant 1 seedling per pot hole, basic seedlings controlled at 25,000 / 667m 2 .

[0046] (5) Fertilizer and water management: Apply pure nitrogen 11kg / 667m during the entire growth period 2 , basal fertilizer accounted for 40%, compound fertilizer (N-P2O5-K2O=15-15-15) was applied one day before transplanting, tillering fertilizer accounted for 30%, urea (content was 46%) was applied 5 days after transplanting, panicle fertilizer accounted for 30%, urea (content was 46%) was applied at the 4th leaf stage, and potassium fertilizer was applied once at the jointing stage of rice (the internode of the main stem extended 2cm), KCl (content was 60%) 7kg / 667m 2 ; Water management is carried out according to the principle of "thin-dry-shallow-wet". A 3 cm thin water layer is maintained in the field when transplanting rice seedlings. The field is exposed to the sun during the critical leaf age of effective tillering. A 5 cm shallow water layer is maintained from the jointing and heading stage. Alternating dry and wet irrigation is maintained during the filling and fruiting period.

[0047] Example 4

[0048] In 2022 and 2023, at the rice base in Leli Village, Wanfenglin, Xingyi City, Qiannan Prefecture, Guizhou Province, the effects of seedling raising methods and transplanting time on rice production will be studied.

[0049] 1. Experimental Design

[0050] The hybrid indica rice variety Taifengyou 79 was selected and two treatments were set: farmers' habitual cultivation (control) and sparse planting of seedlings in pot trays:

[0051] (1) Farmers’ customary cultivation (control): sowing on April 5, raising seedlings in a wet environment, transplanting on May 20 at 7-leaf age, planting 2 seedlings per hole, with a planting density of 8,000 holes / 667 m 2 ;

[0052] (2) Cultivation of seedlings in pots and trays: Sowing on April 25, raising seedlings in pots and trays, sowing 5 seeds in each hole, transplanting on May 20 at 4.5 leaf age, planting one seedling in each hole, with a planting density of 8,000 holes / 667m 2 .

[0053] Area: 20m 2 , repeated 3 times. The rest of the management methods are the same as in Example 1.

[0054] 2. Survey items and measurement methods

[0055] Dry matter: After transplanting, 30 holes were set up for each treatment, and the number of tillers was investigated at the jointing stage, heading stage and maturity stage (the number of effective ears was the maturity stage). Five holes of representative plants were selected for each treatment according to the average number of tillers. The plants were separated by organs (stem sheath, leaf, and ear), withered at 105°C for 30 min, and then dried at 80°C to constant weight. The dry matter accumulation at each growth stage was calculated.

[0056] Yield and its components: The number of maturity stages was calculated by taking 30 holes marked at fixed points in each plot to calculate the average number of effective ears, and 5 holes of representative plants were selected to determine the number of grains per ear, fruit setting rate, 1000-grain weight, and the actual yield of the plot was collected.

[0057] 3. Test results

[0058] As shown in Table 1, compared with farmers' habitual cultivation (control), the number of grains per ear of rice cultivated with dense seedlings and sparse planting in pots and trays decreased overall, the fruit set rate and 1000-grain weight were basically the same, but the number of effective ears increased significantly, and the trend was consistent in the two years. In 2022 and 2023, the number of effective ears of rice cultivated with dense seedlings and sparse planting in pots and trays increased by an average of 24.71% compared with farmers' habitual cultivation (control), and the final rice yield increased by 15.99%, and the differences were all significant.

[0059] Table 1 Effects of dense seeding and sparse planting of small seedlings in pots and trays on rice yield and its components

[0060]

[0061] Note: * indicates that there is a significant difference between the two treatments at the 5% level.

[0062] As shown in Table 2, compared with the farmers' habitual cultivation (control), the dry matter accumulation of rice cultivated with dense seedlings and sparse planting in pot trays increased at all growth stages, among which the difference in jointing stage did not reach a significant level, while the differences in heading stage and maturity stage reached a significant level. Compared with the farmers' habitual cultivation (control), the dry matter accumulation of rice cultivated with dense seedlings and sparse planting in pot trays increased by 13.63% at the heading stage and 14.59% at the maturity stage, and the harvest index also showed a significant increasing trend.

[0063] Table 2 Effects of dense seeding and sparse planting of small seedlings in pot trays on the accumulation of rice dry matter

[0064]

[0065] Note: * indicates that there is a significant difference between the two treatments at the 5% level.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A rice cultivation method using dense seeding in pots and trays and sparse planting of small seedlings, characterized in that: The rice is grown in a plastic pot tray, 4-5 seeds are sown in each pot hole, and 3-4 seedlings are grown in each hole; after the rice seedlings are grown, the rice seedlings are transplanted when the main stem is 3.5-4.5 leaves old, and the transplanting density is 0.6-0.8 thousand holes / 667m 2 .

2. The rice cultivation method according to claim 1, characterized in that: The rice variety is a large-panicle rice variety.

3. The rice cultivation method according to claim 1 or 2, characterized in that: The rice variety is selected from Taiyou 808, Rong 18you 2348 or Xingliangyou 578.

4. The rice cultivation method according to claim 1, characterized in that: During the seedling raising period, the non-woven fabric or plastic film is covered with an arch, the temperature inside the film is 28-32°C during the seedling emergence period, the moisture content of the nutrient soil in the pot tray is maintained at 60%-85% before the 2-leaf stage, the film is removed and compound fertilizer is applied after 2 leaves and 1 heart, and then water drought management is implemented, and grafting fertilizer is applied 2-3 days before transplanting.

5. The rice cultivation method according to claim 1, characterized in that: The transplanting is carried out by manual planting, seedling throwing or a pot seedling transplanter.

6. The rice cultivation method according to claim 1, characterized in that: The transplanting hole spacing is 33cm×26-30cm, one hole is transplanted in each pot hole, and the basic seedlings are 24,000-30,000 plants / 667m 2 .

7. The rice cultivation method according to claim 1, characterized in that: It also includes fertilization management: 11-13kg / 667m nitrogen is applied during the whole growth period of rice. 2 , applied according to mass proportion: base fertilizer: tillering fertilizer: ear fertilizer = 4:3:

3.

8. The rice cultivation method according to claim 7, characterized in that: The fertilization management also includes topdressing KCl 7-9kg / 667m during the rice jointing period. 2 .

9. The rice cultivation method according to claim 1, characterized in that: It also includes water management: "thin-dry-shallow-wet" is carried out. When transplanting seedlings, a thin water layer of 1-3 cm is maintained in the field until the seedlings reach the critical leaf age for effective tillering, and the field is exposed to the sun. Water is restored during the jointing period, maintaining a shallow water layer of 3-5 cm. Alternating dry and wet irrigation is maintained during the filling and fruiting period.

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