A method for promoting early maturity and high yield of oilseed rape by regulating plant density and application thereof

Abstract

The application provides a method for promoting early maturity and high yield of rape and application thereof, and belongs to the technical field of agricultural planting. The method fully considers different planting modes and light and temperature resource conditions of rice-rice-oil and rice-re-oil three-crop areas, under the condition of high-density cultivation of 40,000 plants per mu, according to the nutrient demand law of different maturity period rape varieties, the application precisely controls the fertilization amount and fertilization mode of nitrogen, phosphorus and potassium fertilizer, and designs a targeted fertilization scheme, so that the yield of direct-seeded winter rape in the south rice-oil multi-crop area is ensured, and the early maturity of direct-seeded winter rape in the south rice-oil multi-crop area is promoted. The method is conducive to relieving the problem of the stubble contradiction of rice-oil rotation in the three-crop area, can fully utilize the winter idle field in the south, and promote the simultaneous increase of grain and oil.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of agricultural planting, and particularly relates to a fertilizer density regulation method for promoting early maturity and high yield of rapeseed and application thereof. BACKGROUND

[0002] In recent years, the demand for vegetable oil in China is increasing, and the situation of serious shortage of supply is becoming more and more severe. Based on the actual situation of China, such as more people, less land, prominent bottleneck of arable land resources, difficult task of grain production, and increasing supply gap of important oil crops, developing rice-oil multi-cropping area rapeseed production is an important way to expand oil production and realize the expansion of oil supply on the basis of ensuring grain production. However, due to the prominent contradiction between rice and oil in the rice-oil multi-cropping area, combined with the poor planting benefit of rapeseed, many double-cropping rice fields are abandoned in winter to become winter fallow fields. In order to solve the problem of crop rotation contradiction in multi-cropping areas and improve the resource utilization of winter fallow fields, a batch of early-maturing rapeseed varieties with a growth period of less than 180 days have been bred in China, among which the varieties such as Yangguang 131 have been gradually promoted in multi-cropping areas in recent years. However, under the existing cultivation measures, it is difficult to fully exert the early-maturing potential of the varieties, and there is still a great risk in the maturity period. In addition, there are still few short-growth-period rapeseed varieties, and it is difficult to make a major breakthrough in breeding work in a short period of time. Therefore, on the basis of existing rapeseed varieties, through the matching of cultivation measures and nutrient management techniques, promoting early maturity and high yield of rapeseed in multi-cropping areas has great strategic significance for developing multi-cropping area winter fallow field rapeseed and ensuring China's grain and oil safety. SUMMARY

[0003] In order to solve the above technical problems, the application provides a fertilizer density regulation method for promoting early maturity and high yield of rapeseed and application thereof. The application fully considers different planting methods and light and temperature resource conditions in rice-rice-oil and rice-re-oil three-cropping areas, under the condition of high-density cultivation of 40,000 plants per mu, according to the nutrient demand law of different maturity period rapeseed varieties, the application precisely controls the fertilization amount and fertilization method of nitrogen, phosphorus and potassium fertilizer, designs a targeted fertilization scheme, not only ensures the yield of direct-seeded winter rapeseed in the rice-oil multi-cropping area in the south, but also promotes the early maturity of the direct-seeded winter rapeseed in the rice-oil multi-cropping area in the south. The method in the application is helpful to alleviate the crop rotation contradiction problem of rice-oil rotation in three-cropping areas, can fully utilize the winter fallow field in the south, and promote the grain and oil abundance.

[0004] In order to achieve the above purpose, the application adopts the following technical scheme:

[0005] The application provides a kind of early maturity of rape high yield is promoted and is controlled method, the high density cultivation condition of rape 4 million plants per mu is under, by different production area and different rape varieties, the fertilization amount and fertilization mode of nitrogen phosphorus potassium fertilizer are accurately controlled;Wherein, the fertilization amount of nitrogen phosphorus potassium fertilizer is controlled as: every mu N 10.5~11.5 kg, P2O5 4~5 kg, K2O 6~9 kg, the fertilization mode of nitrogen phosphorus potassium fertilizer is controlled as: the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer =(2.5~3.5):1, phosphorus fertilizer is once applied as base fertilizer, the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer =(1~3):1.

[0006] Preferably, the method is specifically:

[0007] In rice-rice-oil production area, when early-maturing varieties are selected for direct seeding of rape, the fertilization amount is N 10.5~11.5 kg, P2O5 4~5 kg, K2O 5.5~6.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer =(2.5~3.5):1, phosphorus fertilizer is once applied as base fertilizer, the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer =(2.5~3.5):1; when mid-late-maturing varieties are selected for direct seeding of rape, the fertilization amount is N 10.5~11.5 kg, P2O5 4~5 kg, K2O 8.5~9.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer =(2.5~3.5):1, phosphorus fertilizer is once applied as base fertilizer, the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer =(0.5~1.5):1;

[0008] In rice-rice-oil production area, when early-maturing varieties are selected for direct seeding of rape, the fertilization amount is N 10.5~11.5 kg, P2O5 4~5 kg, K2O 5.5~6.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer =(2.5~3.5):1, phosphorus fertilizer is once applied as base fertilizer, the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer =(2.5~3.5):1; when mid-late-maturing varieties are selected for direct seeding of rape, the fertilization amount is N 10.5~11.5 kg, P2O5 4~5 kg, K2O 8.5~9.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer =(2.5~3.5):1, phosphorus fertilizer is once applied as base fertilizer, the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer =(0.5~1.5):1;

[0009] Further preferably, the method is:

[0010] In the rice-rice-oil production area, when early-maturing varieties of direct-seeded rape are selected, the fertilization amount is N 10.6 kg, P2O5 4.5 kg, K2O 6 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer = 3:1, phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and ear fertilizer = 3:1; when medium-late-maturing varieties of direct-seeded rape are selected, the fertilization amount is N 10.6 kg, P2O5 4.5 kg, K2O 9 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer = 3:1, phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and ear fertilizer = 1:1;

[0011] In the rice-re-oil production area, when early-maturing varieties of direct-seeded rape are selected, the fertilization amount is N 10.6 kg, P2O5 4.5 kg, K2O 7.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer = 3:1, phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and ear fertilizer = 1.5:1; when medium-late-maturing varieties of direct-seeded rape are selected, the fertilization amount is N 10.6 kg, P2O5 4.5 kg, K2O 9 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: overwintering fertilizer = 3:1, phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and ear fertilizer = 1:1.

[0012] Preferably, the early-maturing variety of direct-seeded rape is selected from Sunshine 131.

[0013] Preferably, the medium-late-maturing variety of direct-seeded rape is selected from Dadi 199.

[0014] The application further provides an application of the fertilization and density control method in direct-seeded winter rape planting in a southern rice-oil multi-cropping area.

[0015] Preferably, the application is an application in promoting early maturation of direct-seeded winter rape in a southern rice-oil multi-cropping area.

[0016] Preferably, the application is an application in promoting high yield of direct-seeded winter rape in a southern rice-oil multi-cropping area.

[0017] The mechanism of action in the application is as follows:

[0018] (1) Early-maturing rape has a short growth period and generally low yield, and it is necessary to increase density to increase population yield, and the application studies the fertilization technology under high density.

[0019] (2) There are certain differences in light and temperature resources in different ecological areas (rice-rice-oil and rice-re-oil), which further leads to different growth periods of the same rape variety, and it is necessary to study the nutrient demand law of rape of different maturation periods according to the regional resource characteristics.

[0020] (3) While complete basal application of nitrogen is beneficial to the early growth of rapeseed, it can lead to insufficient nitrogen nutrition in the late vegetative growth stage. Appropriate delayed application of nitrogen fertilizer can improve the grain-filling rate, increase the accumulation of dry matter after flowering, and thus increase yield. However, excessive application of nitrogen fertilizer can cause rapeseed to grow vegetatively and mature late, affecting the sowing of subsequent rice crops and exacerbating crop rotation conflicts. Appropriate control of phosphorus can promote the transfer of dry matter to grains before flowering, delay the duration of grain filling, and have little impact on yield. Increasing the amount of potassium can increase the maximum and average rate of dry matter accumulation in the later stages of crop growth, allowing the maximum grain-filling rate to occur earlier, which is conducive to reaching the harvest requirements earlier. At the same time, potassium helps to increase the cellulose content of stems, enhance the plant's lodging resistance, reduce the occurrence of post-flowering diseases, and increase rapeseed grain yield.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The fertilization method conforms to the nutrient requirements of rapeseed, and is more scientific and reasonable.

[0023] Existing fertilization techniques do not consider factors such as light and temperature resources at different latitudes and rapeseed varieties, and all use 40 kg of compound fertilizer (15-15-15) as basal application. However, this invention recommends different fertilization methods for different planting methods in three-crop areas, and takes into account the nutrient requirements of rapeseed varieties at different latitudes and different maturity periods, which is more scientific and reasonable.

[0024] (2) It promoted early maturity of rapeseed, enabling it to reach harvest requirements ahead of schedule.

[0025] In rice-rice-oilseed production areas, when early-maturing varieties are selected for direct-seeded rapeseed, treatment 3 in this invention flowers 5 days earlier and reaches the harvest requirement 2 days earlier than treatment 1 (farmers' usual fertilization); when medium-late-maturing varieties are selected for direct-seeded rapeseed, treatment 5 in this invention reaches the harvest requirement 2 days earlier.

[0026] In rice-oilseed rape production areas, when early-maturing varieties are selected for direct-seeded rapeseed, treatment 4 in this invention reaches the harvest requirement 6 days earlier than treatment 1 (farmers' usual fertilization). When medium-late-maturing varieties are selected for direct-seeded rapeseed, treatment 5 in this invention reaches the harvest requirement 5 days earlier.

[0027] Therefore, the fertilization method in this invention promotes early maturity of rapeseed in triple-cropping areas, alleviates crop rotation conflicts, and facilitates the efficient utilization of fallow fields in winter.

[0028] (3) Ensured rapeseed yield

[0029] In the rice-rice-oil production area, when early-maturing varieties are selected for direct seeding of oilseed rape, the yield of treatment 3 and treatment 5 of the present application is increased by 2.4% and 13.6% respectively compared with treatment 1 (conventional fertilization: farmer's customary fertilization). When mid-late-maturing varieties are selected for direct seeding of oilseed rape, the yield of treatment 2, treatment 4 and treatment 5 of the present application is increased by 3.5%, 9.6% and 16.2% respectively compared with treatment 1 (farmer's customary fertilization).

[0030] In the rice-rice-oil production area, when early-maturing varieties are selected for direct seeding of oilseed rape, the yield of treatment 3 and treatment 5 of the present application is increased by 2.4% and 13.6% respectively compared with treatment 1 (conventional fertilization: farmer's customary fertilization). When mid-late-maturing varieties are selected for direct seeding of oilseed rape, the yield of treatment 2, treatment 4 and treatment 5 of the present application is increased by 3.5%, 9.6% and 16.2% respectively compared with treatment 1 (farmer's customary fertilization).

[0031] Therefore, the fertilization method of the present application also has remarkable effect on yield increase of oilseed rape in the three-crop area. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Yield and oil content of Yangguang 131 (left) and Dadi 199 (right) under different fertilization treatments in Example 1 of the present application;

[0033] Figure 2 Growth process of Yangguang 131 (left) and Dadi 199 (right) under different fertilization treatments in Example 1 of the present application;

[0034] Figure 3 Dynamic change of seed mass and oil content of Yangguang 131 and Dadi 199 under different fertilization treatments in Example 1 of the present application;

[0035] Figure 4 Yield and oil content of Yangguang 131 (left) and Dadi 199 (right) under different fertilization treatments in Example 2 of the present application;

[0036] Figure 5 Growth process of Yangguang 131 (left) and Dadi 199 (right) under different fertilization treatments in Example 2 of the present application;

[0037] Figure 6 Dynamic change of seed mass and oil content of Yangguang 131 and Dadi 199 under different fertilization treatments in Example 2 of the present application. DETAILED DESCRIPTION

[0038] The following examples are intended to illustrate the present application but not to limit the scope of the present application. Modifications or substitutions of the method, steps or conditions of the present application are included in the scope of the present application without departing from the spirit and essence of the present application. In the examples of the present application, the equipment, raw materials and the like used are commercially available unless otherwise specified, and the method used is consistent with the conventional method unless otherwise specified.

[0039] The content of N, P2O5 and K2O in the compound fertilizer (15-15-15) used in the examples of the present application is 15%, 15% and 15%, respectively.

[0040] The technical solutions of the present application will be further described in detail below in combination with examples.

[0041] Example 1

[0042] In 2022-2023, a fertilization treatment test of two rape varieties was carried out in the experimental field of Jiangxi Institute of Agricultural Sciences in Jiangxi Province, China. The specific test steps are as follows:

[0043] Test site overview: The test site is located in a rice-rice-oil production area, the previous crop is rice, the soil is red soil, the fertility is medium, the land is flat, and the irrigation is convenient.

[0044] Test material: The varieties selected are early-maturing variety Yangguang 131 and mid-late-maturing variety Dadi 199.

[0045] Test method: Five fertilization treatments were set up, and the specific fertilization treatments are shown in Table 1. Three repetitions were set up, and each plot was 20 m 2 . Direct seeding (strip seeding) was used, and the seeds were sown on October 25.

[0046] Table 1 Fertilization scheme

[0047]

[0048] Field management: Four protection rows were set up. Seedlings were selected during the three-leaf period, and seedlings were selected during the five-leaf period, with a density of 40,000 plants per mu. Other management was carried out according to the conventional operation in the field, and attention was paid to the prevention of diseases, insects and weeds.

[0049] Test index: During the growth period of rape, the growth period of rape in each plot was observed and recorded; the yield of each plot was determined, and the yield per mu was calculated, and the oil content of the seeds was determined; before harvesting, the dynamic changes of the grain quality and oil content of different treatments were determined for one week.

[0050] (1) The yield and oil content of the seeds are shown in Table 1. Figure 1

[0051] ​The results show that the yield difference between Sunlight 131 and Dadi 199 is not significant, but the oil content of Dadi 199 is significantly higher than that of Sunlight 131. For Sunlight 131, the yield of treatment 3 and treatment 5 is increased by 2.4% and 13.6% respectively compared with treatment 1 (conventional fertilization: farmer's habit fertilization). Compared with treatment 1 (farmer's habit fertilization), the oil content of rapeseed of treatment 2, treatment 3 and treatment 4 is increased by 1.7%, 2.8% and 0.5% respectively. In terms of Dadi 199 variety, the yield of treatment 2, treatment 4 and treatment 5 is increased by 3.5%, 9.6% and 16.2% respectively compared with treatment 1 (farmer's habit fertilization). Compared with treatment 1 (farmer's habit fertilization), the oil content of rapeseed of treatment 3 is increased by 0.5 percentage points, and the oil content of rapeseed of other treatments is decreased, and the decrease of treatment 4 is the lowest, which is decreased by 0.8 percentage points.

[0052] (2) The growth process of rapeseed and the dynamic changes of seed quality and oil content before harvest are as shown in Figure 2 、 3 .

[0053] The results show that in Ji'an, Jiangxi, the growth period of Sunlight 131 is 176 days, and the growth period of Dadi 199 is 179 days. Fertilizer regulation (controlling nitrogen, reducing phosphorus and increasing potassium) can obviously promote Sunlight 131 to flower earlier, and make Dadi 199 flower earlier. From the dynamic of seed filling and the dynamic of oil content accumulation, it can be seen that adjusting nitrogen, controlling phosphorus and increasing potassium can make the physiological maturity period of Sunlight 131 in Ji'an, Jiangxi 2-4 days earlier.

[0054] From the yield and growth period, in the rice-rice-oil production area, when the early-maturing variety Sunlight 131 is selected for direct-seeding rapeseed, treatment 3 is the optimal scheme, and when the medium-late-maturing variety Dadi 199 is selected for direct-seeding rapeseed, treatment 5 is the optimal scheme.

[0055] Example 2

[0056] In 2022-2023, a fertilization treatment test of two rapeseed varieties was carried out in the test field of Jingzhou City, Hubei Province, China, and the specific test steps are as follows:

[0057] Test site: The test site is located in the rice-reed (regenerative rice)-oil production area, the previous crop is rice, the soil is sandy loam, the fertility is medium, the land is flat, and the irrigation is convenient.

[0058] Test material: Early-maturing variety Sunlight 131 and medium-late-maturing variety Dadi 199 are selected.

[0059] Test method: Five fertilization treatments are set, and the specific fertilization treatments are also shown in Table 1 above. Three repetitions are set, and each plot is 20 m 2 . Direct-seeding (strip seeding) is used for planting, and the seeding is carried out on October 20.

[0060] Field management and test indices were also as shown in Example 1 above.

[0061] (1) The yield and seed oil content results are shown in Table 1. Figure 4

[0062] The results show that in terms of yield and seed oil content, Dadi 199 is significantly higher than Sunlight 131. For Sunlight 131, the yield of treatments 3, 4 and 5 is increased by 1.1%, 2.5% and 7.5% respectively compared with treatment 1 (farmer's customary fertilization). Compared with treatment 1 (farmer's customary fertilization), the oil content of rapeseed of treatments 2, 4 and 5 is increased by 0.8, 1.8 and 1.2 percentage points respectively. In terms of Dadi 199 variety, only the yield of treatment 5 is increased by 2.3% compared with treatment 1 (farmer's customary fertilization), and the yield of other treatments is slightly decreased. Compared with treatment 1 (farmer's customary fertilization), the oil content of rapeseed of treatments 2, 3 and 5 is increased by 0.5, 0.8 and 0.1 percentage points respectively, and the oil content of treatment 4 is slightly decreased.

[0063] (2) The growth process of rapeseed, and the dynamic changes of seed mass and oil content before harvest are shown in Tables 2 and 3. Figure 5 6

[0064] The results show that in Hubei Jingzhou, the growth period of Sunlight 131 is 193 days, and that of Dadi 199 is 200 days. Controlling nitrogen and reducing phosphorus can promote Sunlight 131 to bolt and flower earlier, and increasing potassium only makes it flower earlier. For Dadi 199, controlling nitrogen and reducing phosphorus and increasing potassium mainly make it bolt earlier, but due to the extension of the bolting-flowering stage, the flowering time difference is not obvious. From the dynamic of seed filling and oil accumulation, adjusting nitrogen, controlling phosphorus and increasing potassium make the early-maturing variety Sunlight 131 end the filling period 7-9 days earlier, but the oil accumulation only ends 3 days earlier.

[0065] From the yield and growth period, in the rice-reed (regenerated rice)-oil production area, when the early-maturing variety Sunlight 131 is selected for direct-seeded rapeseed, treatment 4 is the optimal scheme, and when the medium-late-maturing variety Dadi 199 is selected for direct-seeded rapeseed, treatment 5 is the optimal scheme.

[0066] The above-described examples only describe the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.​​​

Claims

1. A method for promoting early maturity and high yield of oilseed rape by regulating plant density, characterized in that, The density control method is used in the high-density cultivation condition of 40,000 rape plants per mu, and the amount and method of nitrogen, phosphorus and potassium fertilization are precisely controlled according to different production areas and different rape varieties; the specific method is as follows: In the rice-rice-oil production area, when early-maturing varieties are selected for direct seeding of rape, the amount of fertilization is N 10.5-11.5 kg per mu, P2O5 4-5 kg per mu, and K2O 5.5-6.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: wintering fertilizer = (2.5-3.5):1, the phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer = (2.5-3.5):1; when medium-late-maturing varieties are selected for direct seeding of rape, the amount of fertilization is N 10.5-11.5 kg per mu, P2O5 4-5 kg per mu, and K2O 8.5-9.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: wintering fertilizer = (2.5-3.5):1, the phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer = (0.5-1.5):1; In the rice-rice-oil production area, when early-maturing varieties are selected for direct seeding of rape, the amount of fertilization is N 10.5-11.5 kg per mu, P2O5 4-5 kg per mu, and K2O 5.5-6.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: wintering fertilizer = (2.5-3.5):1, the phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer = (2.5-3.5):1; when medium-late-maturing varieties are selected for direct seeding of rape, the amount of fertilization is N 10.5-11.5 kg per mu, P2O5 4-5 kg per mu, and K2O 8.5-9.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: wintering fertilizer = (2.5-3.5):1, the phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer = (0.5-1.5):

1.

2. The method of density regulation according to claim 1, wherein, The method is as follows: In the rice-rice-oil production area, when early-maturing varieties are selected for direct seeding of rape, the amount of fertilization is N 10.5-11.5 kg per mu, P2O5 4-5 kg per mu, and K2O 5.5-6.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: wintering fertilizer = (2.5-3.5):1, the phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer = (2.5-3.5):1; when medium-late-maturing varieties are selected for direct seeding of rape, the amount of fertilization is N 10.5-11.5 kg per mu, P2O5 4-5 kg per mu, and K2O 8.5-9.5 kg per mu, the application ratio of nitrogen fertilizer is base fertilizer: wintering fertilizer = (2.5-3.5):1, the phosphorus fertilizer is applied as base fertilizer at one time, and the application ratio of potassium fertilizer is base fertilizer: bud and earing fertilizer = (0.5-1.5):

1. In the rice-oil production area, when early-maturing varieties of direct-seeded rape are selected, the amount of fertilizer applied is N 10.6 kg, P2O5 4.5 kg, and K2O 7.5 kg per mu, the proportion of nitrogen fertilizer applied is base fertilizer: wintering fertilizer = 3:1, phosphorus fertilizer is applied as base fertilizer at one time, and the proportion of potassium fertilizer applied is base fertilizer: bud and ear fertilizer = 1.5:1; when mid-late-maturing varieties of direct-seeded rape are selected, the amount of fertilizer applied is N 10.6 kg, P2O5 4.5 kg, and K2O 9 kg per mu, the proportion of nitrogen fertilizer applied is base fertilizer: wintering fertilizer = 3:1, phosphorus fertilizer is applied as base fertilizer at one time, and the proportion of potassium fertilizer applied is base fertilizer: bud and ear fertilizer = 1:

1.

3. The method of density regulation according to claim 1, wherein The early-maturing variety of direct-seeded rape is selected from Sunshine 131.

4. The method of density regulation according to claim 1, wherein The mid-late-maturing variety of direct-seeded rape is selected from Dadi 199.

5. Application of the fertilizer density control method according to any one of claims 1-4 in direct-seeded winter rape planting in the south rice-oil multi-cropping area.

6. Use according to claim 5, characterized in that, The application is in promoting early maturation of direct-seeded winter rape in the south rice-oil multi-cropping area.

7. Use according to claim 5, characterized in that, The application is in promoting high yield of direct-seeded winter rape in the south rice-oil multi-cropping area. The application is in promoting high yield of direct-seeded winter rape in the south rice-oil multi-cropping area.

Images