Formula and application method of slow bulk blending fertilizer for rice

Abstract

The invention discloses a slow-speed bulk blending fertilizer formula for rice and an application method of the slow-speed bulk blending fertilizer formula, the slow-speed bulk blending fertilizer formula for rice comprises nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer, and the ratio of nitrogen to phosphorus to potassium is 3: 1: 1; the nitrogenous fertilizer comprises a combined slow-release nitrogenous fertilizer and a quick-acting nitrogenous fertilizer, the mass ratio of the quick-acting nitrogenous fertilizer in the nitrogenous fertilizer is 20-30%, the combined slow-release nitrogenous fertilizer comprises a first slow-release nitrogenous fertilizer, a second slow-release nitrogenous fertilizer and a third slow-release nitrogenous fertilizer, the release period of the first slow-release nitrogenous fertilizer is 30 d, the release period of the second slow-release nitrogenous fertilizer is 60 d, and the release period of the third slow-release nitrogenous fertilizer is 90 d; the preparation ratio of the first slow-release nitrogen fertilizer to the second slow-release nitrogen fertilizer to the third slow-release nitrogen fertilizer is 1: (1-4): 1; the application method comprises the following steps: blending the combined slow-release nitrogen fertilizer, the phosphate fertilizer and the potash fertilizer to prepare a slow-release blended fertilizer, and applying once as a base fertilizer; using the quick-acting nitrogen fertilizer as a tillering fertilizer or a panicle fertilizer; the nitrogen application amount is 240 to 270 kg * hm <-2 >. By applying the slow-speed bulk blending fertilizer for rice and the application method, the effects of nitrogen saving, yield increasing, quality improving and efficiency increasing can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of agriculture and relates to a slow-release blended fertilizer formula for rice and its application method. Background Art

[0002] More than two-thirds of the population in China takes rice as the staple food. To steadily increase the rice yield, fertilization is an extremely effective production measure. For many years, the fertilization of rice in China has mainly relied on quick-acting chemical fertilizers. Although quick-acting (nitrogen) fertilizers have a fast fertilizer effect, their fertilizer effect period is short, and multiple applications are required to meet the nutrient requirements of rice throughout the growth period. The number of fertilization times can reach 4 - 5 times or even more. Due to the large amount of (nitrogen) fertilizer applied and frequent fertilization, the nitrogen fertilizer utilization rate is low, and fertilizer loss is serious, increasing the risk of environmental pollution and production costs. Slow-release fertilizers have the characteristics of slowly releasing nitrogen nutrition, continuously supplying nitrogen to crops, fewer fertilization times, even as low as once, low (nitrogen) fertilizer application rate, and low fertilization cost. In recent years, the application of slow-release fertilizers in rice has been in a stage of active promotion and growth. The machine-transplanted slow-mixed single fertilization technology is mostly used, and the annual promotion and application area of this technology in major rice-producing areas such as Jiangsu and Anhui exceeds 6 million mu.

[0003] Sulfur-coated urea slow-release fertilizer is made by coating urea with sulfur and microcrystalline wax sealant. It has four products with different release periods of 30d, 60d, 90d, and 120d for slow-release nitrogen. They have their respective nutrient release characteristics, but it is not clear how they affect soil nutrients, rice growth and development, and yield formation, and how to apply the four products for better effects. Existing fertilization technologies require multiple fertilizations throughout the growth cycle of rice, and the nitrogen fertilizer utilization rate is relatively low. Therefore, how to improve the application effect of fertilizers is crucial for cost savings and increasing crop yields. Summary of the Invention

[0004] Object of the Invention: The object of the present invention is to provide a slow-release blended fertilizer formula for rice and its application method, which solves the problems of multiple fertilization times and low nitrogen fertilizer utilization rate in traditional fertilization methods.

[0005] Technical Solution: The slow-release blended fertilizer formula for rice of the present invention includes nitrogen fertilizer, phosphate fertilizer, and potassium fertilizer, and the ratio of nitrogen:phosphorus:potassium in the nitrogen fertilizer, phosphate fertilizer, and potassium fertilizer is 3:1:1; the nitrogen fertilizer includes combined slow-release nitrogen fertilizer and quick-acting nitrogen fertilizer, and the mass ratio of the quick-acting nitrogen fertilizer in the nitrogen fertilizer is 20 - 30%; the combined slow-release nitrogen fertilizer includes a first slow-release nitrogen fertilizer, a second slow-release nitrogen fertilizer, and a third slow-release nitrogen fertilizer. The release period of the first slow-release nitrogen fertilizer is 30d, the release period of the second slow-release nitrogen fertilizer is 60d, and the release period of the third slow-release nitrogen fertilizer is 90d; the configuration ratio of the first slow-release nitrogen fertilizer, the second slow-release nitrogen fertilizer, and the third slow-release nitrogen fertilizer in the combined slow-release nitrogen fertilizer is 1:(1 - 4):1.

[0006] Furthermore, the mass proportion of the quick-release nitrogen fertilizer in the nitrogen fertilizer is 30%, and the configuration ratio of the first slow-release nitrogen fertilizer, the second slow-release nitrogen fertilizer, and the third slow-release nitrogen fertilizer in the combined slow-release nitrogen fertilizer is 1:4:1.

[0007] Furthermore, the quick-acting nitrogen fertilizer is urea.

[0008] The present invention provides a method for applying a slow-blending fertilizer for rice, wherein the slow-blending fertilizer formula is applied to rice, and the application method comprises the following steps:

[0009] (1) mixing the combined slow-release nitrogen fertilizer with phosphate fertilizer and potash fertilizer to prepare a slow-release blended fertilizer, and applying it once as a base fertilizer;

[0010] (2) using the quick-acting nitrogen fertilizer as tillering fertilizer or ear fertilizer;

[0011] Nitrogen application rate is 240-270 kg·hm -2 .

[0012] Furthermore, in step (1), the basal fertilizer is applied once 1 day before rice transplanting.

[0013] Furthermore, in step (2), when the rice is a variety with a medium or short growth period, the quick-acting nitrogen fertilizer is used as a tillering fertilizer; when the rice is a variety with a long growth period, the quick-acting nitrogen fertilizer is used as an ear fertilizer.

[0014] Furthermore, when the quick-acting nitrogen fertilizer is used as a tillering fertilizer, it is applied once 7-10 days after rice planting.

[0015] Furthermore, when the quick-acting nitrogen fertilizer is used as ear fertilizer, the flowering-promoting fertilizer is applied once when the rice plant is at the 3.5-leaf stage.

[0016] Furthermore, the step (1) also includes chopping the wheat or rapeseed straw into pieces and returning all of it to the field before applying the base fertilizer; and the step (1) also includes irrigating the field with water after mechanical rotary tillage, leveling the rice field, and applying sealing drugs after applying the base fertilizer.

[0017] Furthermore, when transplanting rice, select strong rice seedlings of appropriate age and plant them at a density of 300,000 holes / hm2. -2 , 4-5 seedlings per hole.

[0018] Furthermore, a thin layer of water is maintained in the rice fields after transplanting and planting, and alternating wet and dry irrigation is adopted throughout the rest of the rice field to control pests, diseases and weeds.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: The present invention realizes the modern rice production goal of simultaneously improving fertilizer utilization rate, paddy rice yield and rice quality on the premise of appropriately reducing the nitrogen application rate and minimizing the number of fertilization times. By adopting the method for applying the slow-release and blended fertilizer for rice of the present invention, the number of fertilization times in the paddy field is reduced by at least 2 times. Under specific ratios, the yield is increased by 3.76% (conventional precise quantification) - 10.43% (local customary fertilization); the nitrogen fertilizer utilization rate is increased by 13.35% (conventional precise quantification) - 56.76% (local customary fertilization); the nitrogen fertilizer application amount is 12.5% less than that of local customary fertilization. The cost is directly reduced and the efficiency is increased by 1300 (conventional precise quantification) - 3100 yuan per hectare (local customary fertilization). Detailed implementation manners

[0020] In order to better illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0021] The slow-release fertilizers in the following detailed implementation manners and test examples are all slow-release fertilizer series products produced by Hanfeng Agricultural Technology (Taizhou) Co., Ltd.

[0022] The specific implementation manner is as follows: Cultivate suitable and strong seedlings for machine transplanting. After wheat or rape is harvested, its straw is chopped and returned to the paddy field in full amount, slow-release blended fertilizer is applied, the field is mechanically rotary-tilled and then flooded to soak the field, the paddy field is leveled, and a closed herbicide is applied.

[0023] The nitrogen application rate is 240 - 270 kg·hm -2 , the nitrogen fertilizer includes combined slow-release nitrogen fertilizer and quick-acting nitrogen fertilizer, and the ratio of combined slow-release nitrogen fertilizer to quick-acting nitrogen fertilizer is 7:3; the application ratio of nitrogen, phosphorus and potassium is 3:1:1.

[0024] The combined slow-release nitrogen fertilizer includes the first slow-release nitrogen fertilizer, the second slow-release nitrogen fertilizer and the third slow-release nitrogen fertilizer. The release period of the first slow-release nitrogen fertilizer is 30 days, the release period of the second slow-release nitrogen fertilizer is 60 days, and the release period of the third slow-release nitrogen fertilizer is 90 days; the configuration ratio of the first slow-release nitrogen fertilizer, the second slow-release nitrogen fertilizer and the third slow-release nitrogen fertilizer in the combined slow-release nitrogen fertilizer is 1:4:1.

[0025] The slow-release blended fertilizer is made by blending combined slow-release nitrogen fertilizer with phosphate fertilizer and potassium fertilizer, and is applied once as a base fertilizer; the quick-acting nitrogen fertilizer is used as a tillering fertilizer or a panicle fertilizer. In specific embodiments, the quick-acting nitrogen fertilizer adopts conventional urea. When the rice is a variety with medium or short growth period, the quick-acting nitrogen fertilizer is used as a tillering fertilizer and is applied once 7 - 10 days after rice transplanting; when the rice is a variety with long growth period, the quick-acting nitrogen fertilizer is used as a panicle fertilizer and is applied once as a flower-promoting fertilizer at the 3.5th leaf stage from the top of the rice.

[0026] Transplanting density: 300,000 hills·hm -2 , 4 - 5 seedlings per hill, and the basic seedling number is 1.2 - 1.5 million hills·hm-2 。After transplanting, keep a thin water layer in the paddy field, and then adopt alternate wet and dry irrigation throughout the growth period to control diseases, insects and weeds.

[0027] Experimental Example 1: Comparative Test of Slow-release Nitrogen Fertilizer Products

[0028] Pot cultivation. Split-plot design, with the main plot being the straw returning method and the sub-plot being the slow-release nitrogen fertilizer product. The straw returning methods are set at three levels: full amount of wheat straw returned in full, half amount returned, and no straw returned. For full amount of straw returned, 25 g of wheat straw is applied per pot, and for half amount returned, 12.5 g of wheat straw is applied per pot. The slow-release nitrogen fertilizers are set with four product treatments of 30 d, 60 d, 90 d, and 120 d release periods, plus two treatments of conventional precise quantification and CK (no fertilizer application), totaling 18 treatments. 4 g of pure nitrogen is applied per pot for each fertilizer treatment. The slow-release nitrogen fertilizer is applied as a basal fertilizer once; for the conventional precise quantification of nitrogen fertilizer, the operation is as follows: basal fertilizer: tillering fertilizer: panicle fertilizer = 3.5:3:3.5. The basal fertilizer is applied 1 day before transplanting, and the tillering fertilizer is applied 7 days after transplanting; the panicle fertilizer is applied once as a flower-promoting fertilizer at the 3.5th leaf from the top. The experimental data are shown in Table 1.

[0029] Table 1 Effects of Slow-release Nitrogen Fertilizer Products on Rice Yield and Nitrogen Fertilizer Utilization Rate

[0030]

[0031]

[0032] Experimental Example 2: Variety Combination Test of Slow-release Nitrogen Fertilizer

[0033] Pot cultivation. Full amount of wheat straw is returned to the field, with 25 g of wheat straw per pot. 4 g of pure nitrogen is applied per pot. Three slow-release nitrogen fertilizer products with release cycles of 30 d, 60 d, and 90 d are selected. The slow-release nitrogen combinations are set as 30 d + 60 d, 30 d + 90 d, 60 d + 90 d, 30 d + 60 d + 90 d, plus a treatment of conventional quick-acting fertilizer (applied as a basal fertilizer once) and a non-fertilizer treatment (CK), totaling 6 treatments. The slow-release nitrogen products in each combination are mixed in equal proportions; the conventional quick-acting fertilizer is urea. All fertilization treatments are applied as basal fertilizers once. The experimental data are shown in Table 2.

[0034] Table 2 Effects of Slow-release Fertilizer Variety Combinations on Rice Yield and Nitrogen Fertilizer Utilization Rate

[0035]

[0036] Note: In the CK treatment, due to no fertilizer application, the number of panicles and the number of grains per panicle are small, and the growth process is faster than other treatments. The meiosis stage, which is the most sensitive to external environmental conditions during the panicle differentiation period, encounters extremely high temperature stress for a long time, resulting in abnormal development of rice reproductive organs and too low seed setting rate.

[0037] Experimental Example 3: Comparative Test of Fertilizer Varieties

[0038] Field experiment. The tested rice varieties were Nanjing 9108 in Yangzhou, Jiangsu and Nanjing 46 in Changzhou, Jiangsu. Four fertilizer treatments were set up: CK (no fertilizer application), conventional precise quantification, local customary fertilization, and slow-release fertilizer. For conventional precise quantification, the nitrogen application rate was 270 kg·hm -2 , and the nitrogen fertilizer operation was basal fertilizer: tillering fertilizer: panicle fertilizer = 4:2.5:3.5; for local customary fertilization, the nitrogen application rate was 322.5 kg·hm -2 , and the nitrogen fertilizer operation was basal fertilizer: tillering fertilizer: panicle fertilizer = 2.5:6.5:1. The basal fertilizer was applied 1 day before transplanting; for the tillering fertilizer, in the case of conventional precise quantification, it was applied once 7 days after transplanting, and for local customary fertilization, it was applied twice at 7 days and 14 days after transplanting, with each application accounting for 50%; the panicle fertilizer was applied once as a flower-promoting fertilizer at the 3.5th leaf from the top. For the slow-release fertilizer (the slow-release nitrogen adopted a combination of 30d + 60d + 90d, and 3 products were mixed in equal proportion), the nitrogen application rate was 240 (Changzhou) - 270 (Yangzhou) kg·hm -2 , and it was applied as a basal fertilizer once. The experimental data are shown in Table 3-1 (Yangzhou) and Table 3-2 (Changzhou).

[0039] Table 3-1 Effects of fertilizer varieties on rice yield and nitrogen fertilizer utilization rate (Yangzhou)

[0040]

[0041] Table 3-2 Effects of fertilizer varieties on rice yield and nitrogen fertilizer utilization rate (Changzhou)

[0042]

[0043] Experimental Example 4: Slow-release and quick-release blending ratio experiment

[0044] Field experiment. The tested rice varieties were Nanjing 9108 in Yangzhou, Jiangsu and Nanjing 46 in Changzhou, Jiangsu. The nitrogen application rate was 270 kg·hm in Yangzhou -2 , and 240 kg·hm in Changzhou -2 . For the ratio of slow-release nitrogen to quick-acting nitrogen in Yangzhou, three treatments of 7:3, 8:2, and 9:1 were set up, and in Changzhou, four treatments of 6:4, 7:3, 8:2, and 9:1 were set up. In addition, three treatments of conventional precise quantification, local customary fertilization, and one-time basal application of slow-release nitrogen fertilizer (10:0) were added. The slow-release blending ratio treatments (slow-release nitrogen + phosphorus and potassium fertilizers + quick-acting nitrogen) were all applied as basal fertilizers (1 day before transplanting) once, and the application methods of the conventional precise quantification and local customary fertilization treatments were the same as those in Experimental Example 3. The experimental data are shown in Table 4-1 (Yangzhou) and Table 4-2 (Changzhou).

[0045] Table 4-1 Effects of slow-release and quick-release blending ratio on rice yield and nitrogen fertilizer utilization rate (Yangzhou)

[0046]

[0047]

[0048] Table 4-2 Effects of Slow-release Blending Ratio on Rice Yield and Nitrogen Use Efficiency (Changzhou)

[0049]

[0050] Test Example 5: Test on the Application Period of Quick-acting Fertilizer

[0051] Field experiment. The tested rice varieties are Nanjing 9108 (medium growth period) in Yangzhou, Jiangsu, and Nanjing 46 (longer growth period) in Changzhou, Jiangsu. Split-plot design, the main plot is the slow-release blending ratio. In Yangzhou, there are three treatments: 7:3, 8:2, and 9:1; in Changzhou, there are four treatments: 6:4, 7:3, 8:2, and 9:1. The sub-plot is the application period of quick-acting fertilizer. In Yangzhou, there are two treatments: basal fertilizer (1 day before transplanting) and tillering fertilizer (7 days after transplanting); in Changzhou, there are three treatments: tillering fertilizer (7 days after transplanting), panicle fertilizer (flower-promoting fertilizer, the 3.5th leaf from the top), and tillering fertilizer + panicle fertilizer (1:1), all applied once. Additional treatments include CK (no fertilizer application), conventional precise quantification, local customary fertilization, and one-time basal application of slow-release fertilizer (10:0). The slow-release blending ratio treatments (slow-release nitrogen + phosphorus and potassium fertilizers) are all applied as basal fertilizers (1 day before transplanting) once. The application methods of the conventional precise quantification and local customary fertilization treatments are the same as in Test Example 3. The nitrogen application rate is 270 kg·hm -2 in Yangzhou and 240 kg·hm -2 in Changzhou. The test data are shown in Table 5-1 (Yangzhou) and Table 5-2 (Changzhou).

[0052] Table 5-1 Effects of the Application Period of Slow-release Blending Quick-acting Fertilizer on Rice Yield and Nitrogen Use Efficiency (Yangzhou)

[0053]

[0054]

[0055] Table 5-2 Effects of the Application Period of Slow-release Blending Quick-acting Fertilizer on Rice Yield and Nitrogen Use Efficiency (Changzhou)

[0056]

[0057] Test Example 6: Test on the Product Ratio of Optimized Slow-release Nitrogen Combinations

[0058] The nitrogen application rate is 240 kg·hm -2. Slow-release nitrogen application method, slow-release mixing ratio is 7:3. The slow-release nitrogen combination is 30d+60d+90d, and the ratios of each product are set as 1:0.4:1 (60d accounts for 1 / 6), 1:1:1 (60d accounts for 2 / 6), 1:2:1 (60d accounts for 3 / 6), 1:4:1 (60d accounts for 4 / 6), 1:10:1 (60d accounts for 5 / 6), 100% (60d accounts for 6 / 6) 6 treatments, slow-release nitrogen + phosphorus and potassium fertilizers are applied as base fertilizers once, and quick-acting fertilizers are applied as ear fertilizers (flower-promoting fertilizers, 3.5 leaves inverted) once. In addition to conventional precise quantitative, local customary fertilization, and CK (no fertilization), there are a total of 9 treatments. Base fertilizer, tillering fertilizer, and flower-promoting fertilizer are applied 1d before transplanting, 7d after planting, and 3.5 leaves inverted, respectively. The application method of conventional precise quantitative and local customary fertilization treatments is the same as that of Test Example 3. The test data are shown in Table 6.

[0059] Table 6 Effects of optimized combinations of slow-release nitrogen on rice yield and nitrogen fertilizer utilization efficiency

[0060]

[0061] Through the above 6 experiments, 1) it can be seen from Table 1 and Table 2 that the combination of slow-release nitrogen products with different release cycles applied to rice has a more effective application effect than single slow-release nitrogen; 2) it can be seen from Table 1, Table 2 and Table 3 that the yield and other effects of using a single slow-release nitrogen product or combination are not as good as conventional precise quantitative fertilization; 3) it can be seen from Table 4 and Table 5 that when a slow-release blending formula is used, and the proportion of quick-acting nitrogen fertilizer in the total nitrogen fertilizer is 20-30%, and the combination of slow-release nitrogen fertilizer + phosphorus and potassium fertilizer is used as base fertilizer for one-time application, quick-acting nitrogen fertilizer is used as tillering fertilizer (7-10 days after planting, for varieties with medium or short growth period) or ear fertilizer (flower-promoting fertilizer, 3.5 leaves, growth period) Varieties with longer growing periods) have a higher effect when applied once than conventional precise quantitative fertilization and local customary fertilization, and it can be seen that when the proportion of quick-release nitrogen fertilizer in the total nitrogen fertilizer is 30%, that is, the ratio of slow-release nitrogen to quick-release nitrogen is 7:3, the effect is best; 4) Combined with Table 6, it can be seen that when a release cycle of 30d+60d+90d is adopted, and the ratio of 30d:60d:90d is 1:(1-4):1 (corresponding to 60d accounting for 2 / 6, 3 / 6, 4 / 6 in the test), the effect is higher than conventional precise quantitative fertilization and local customary fertilization, and it can be seen that when the ratio of 30d:60d:90d is 1:4:1, that is, 60d accounts for 4 / 6, the effect is best.

[0062] The present invention integrates the high-efficient application technology of slow-release fertilizers for rice based on an optimized slow-release nitrogen formula. By adopting the application method of the slow-release and slow-mixing fertilizer for rice of the present invention, the number of fertilization times in paddy fields is reduced by 2-3 times compared with both conventional precise quantification and local customary fertilization. When the ratio of combined slow-release nitrogen fertilizer to quick-acting nitrogen fertilizer is 7:3, and the ratio of 30d:60d:90d in the combined slow-release nitrogen fertilizer is 1:4:1, the best effect is achieved, reaching: the yield is increased by 3.76% (conventional precise quantification) - 10.43% (local customary fertilization); the nitrogen fertilizer utilization rate is increased by 13.35% (conventional precise quantification) - 56.76% (local customary fertilization); the nitrogen fertilizer dosage is 12.5% less than that of local customary fertilization. The direct cost reduction and efficiency increase per hectare are 1300 (conventional precise quantification) - 3100 (local customary fertilization) yuan. If the slow-release and slow-mixing fertilizer for rice and the application method of the present invention are applied, a demonstration effect of nitrogen-saving, yield-increasing, quality-improving and efficiency-increasing with a relatively large total amount will be generated.

Claims

1. A slow-blending fertilizer formula for rice, characterized in that: The slow-release blended fertilizer formula for rice includes nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer, wherein the nitrogen:phosphorus:potassium of the nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer is 3:1:1; the nitrogen fertilizer includes a combined slow-release nitrogen fertilizer and a quick-acting nitrogen fertilizer, wherein the mass proportion of the quick-acting nitrogen fertilizer in the nitrogen fertilizer is 20-30%, the combined slow-release nitrogen fertilizer includes a first slow-release nitrogen fertilizer, a second slow-release nitrogen fertilizer and a third slow-release nitrogen fertilizer, wherein the release period of the first slow-release nitrogen fertilizer is 30 days, the release period of the second slow-release nitrogen fertilizer is 60 days, and the release period of the third slow-release nitrogen fertilizer is 90 days; and the configuration ratio of the first slow-release nitrogen fertilizer, the second slow-release nitrogen fertilizer and the third slow-release nitrogen fertilizer in the combined slow-release nitrogen fertilizer is 1:(1-4):

1.

2. The slow-blending fertilizer formula for rice according to claim 1, characterized in that: The mass proportion of the quick-acting nitrogen fertilizer in the nitrogen fertilizer is 30%, and the configuration ratio of the first slow-release nitrogen fertilizer, the second slow-release nitrogen fertilizer, and the third slow-release nitrogen fertilizer in the combined slow-release nitrogen fertilizer is 1:4:

1.

3. The slow-blending fertilizer formula for rice according to claim 1, characterized in that: The quick-acting nitrogen fertilizer is urea.

4. A method for applying a slow-blending fertilizer for rice, characterized in that: The slow-blending fertilizer formulation according to any one of claims 1 to 3 is applied to rice, and the application method comprises the following steps: (1) mixing the combined slow-release nitrogen fertilizer with phosphate fertilizer and potash fertilizer to prepare a slow-release blended fertilizer, and applying it once as a base fertilizer; (2) using the quick-acting nitrogen fertilizer as tillering fertilizer or ear fertilizer; Nitrogen application rate is 240-270 kg·hm -2 .

5. The method for applying the slow-blending fertilizer for rice according to claim 4, characterized in that: In the step (1), the basal fertilizer is applied once 1 day before rice transplanting.

6. The method for applying the slow-blending fertilizer for rice according to claim 4, characterized in that: In the step (2), when the rice is a variety with a medium or short growth period, the quick-acting nitrogen fertilizer is used as a tillering fertilizer; when the rice is a variety with a long growth period, the quick-acting nitrogen fertilizer is used as an ear fertilizer.

7. The method for applying the slow-blending fertilizer for rice according to claim 6, characterized in that: When the quick-acting nitrogen fertilizer is used as tillering fertilizer, it is applied once 7-10 days after rice planting.

8. The method for applying the slow-blending fertilizer for rice according to claim 6, characterized in that: When the quick-acting nitrogen fertilizer is used as ear fertilizer, it is applied once as flowering-promoting fertilizer when the rice plant is in the 3.5-leaf stage.

9. The method for applying the slow-blending fertilizer for rice according to claim 4, characterized in that: The step (1) also includes, before applying the base fertilizer, chopping the wheat or rapeseed straw after harvesting and returning all of it to the field; and after applying the base fertilizer, it also includes irrigating the field with water after mechanical rotary tillage, leveling the rice field, and applying sealing medicine.

10. The method for applying the slow-blending fertilizer for rice according to claim 4, characterized in that: When transplanting rice, choose strong seedlings of appropriate age and plant at a density of 300,000 holes / hm2. -2 , 4-5 seedlings per hole.

11. The method for applying the slow-blending fertilizer for rice according to claim 10, characterized in that: A thin layer of water should be maintained in the rice fields after transplanting and planting, and alternating dry and wet irrigation should be used throughout the rest of the rice field to control pests, diseases and weeds.

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