Soil testing and formula fertilization for planting rice
I. Technical introduction
According to the fertilizer demand characteristics and formula fertilization technology of main crops, there are three main principles of soil testing formula fertilization: the first is the combination of organic fertilizer and inorganic fertilizer; the second is the combination of large, medium and trace elements; the third is the combination of land use and cultivation land. Balance between input and output. The methods for determining the amount of fertilizer mainly include soil and plant test recommended fertilization method, fertilizer effect function method, soil nutrient abundance and deficiency index method and nutrient balance method.
II. Operating rules
In the medium fertility field, the soil testing formula fertilization model for rice yield of 460-510 kg per mu is as follows:
(1) the total amount and ratio of fertilization
The nitrogen: phosphorus: potassium is about 0.5: 0.8, the total urea is about 13: 15 kg, the phosphorus pentoxide is 6: 8 kg, the potassium oxide is 9: 13 kg.
(2) fertilization scheme
1. Base fertilizer
(1) applying 1000-1600 kg fresh green manure or 800-1400 kg farm manure per mu of organic manure.
(2) 35 kilograms of special fertilizer for rice, 40 kilograms of superphosphate, 5 kilograms of potassium sulfate and 2 kilograms of zinc sulfate.
2. Topdressing
(1) 8kg urea and 2kg potassium sulfate are applied to tiller fertilizer per mu.
(2) applying urea 5kg / mu and potassium sulfate 4kg / mu for panicle fertilizer.
(3) spraying 0.7 kg urea plus 0.2 kg potassium dihydrogen phosphate and 50 kg water per mu to prevent premature senility.
III. Conclusion
The use of soil testing formula fertilization technology can greatly reduce the production cost, increase the per unit yield and increase the total yield.
- Prev
Storage knack for growing sweet potatoes
1. The type of potato cellar: the sweet potato is stored in a well cellar with a depth of 4.5-5m and a soil layer thickness of 2.5-3m. 2, potato cellar disinfection: put seed potatoes into aseptic cellar storage, potato cellar had better use a new cellar. If the old cellar is used, the wall and bottom of the cellar can be scraped off 3-4cm to reveal new soil.
- Next
Experience of how to manage rice in the field
1. Water management Rice water management should implement intermittent irrigation, shallow water root protection, inch water tillering, seedling foot breaking water control seedlings, shallow water budding and heading, moist strong seeds. In the period of returning to green, the water absorption capacity of rice root system is weak, the people have high demand for water, and the water management should be deep.
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