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 heading, moist strong seeds. In the returning green stage, the rice root system has weak water absorption capacity and high demand for water, and the water management should turn green in deep water (at least 1 inch deep). In the tillering stage, it is necessary to irrigate in shallow water frequently, draining and drying or shelving the field at the end of tillering. The rice panicle development stage is the period that needs the most water in its life, especially from the pollen mother cell division stage to the pollen grain formation stage, which is very sensitive to water, which is the first water critical period of rice, so it is necessary to promote differentiation in shallow water and protect the fetus in an inch of water. heading and flowering to milk maturity is the second water critical period of rice, which should be dry and wet, mainly wet and irrigated at the right time.

2. Nutrient management

Rice needs to absorb various elements continuously in different growth processes, in which N, P, K and Si are the main elements, and the proportion of N, P and K is 2:1:3. Japonica rice needs more N and less K than Candao rice and late rice than early rice.

There were great differences in the absorption of the three elements in different growth stages of rice, and most of the inorganic nutrients needed were absorbed at the tillering stage and long heading stage before heading. Compared with late rice, early rice absorbed more nitrogen in the early stage and N in the early stage.

According to the characteristics of soil structure in Mangshi City, on the basis of increasing the application of organic fertilizer, we should select N, P, K ternary compound fertilizer, supplement boron and zinc, popularize the use of silicon fertilizer, and adjust the amount of various fertilizers according to altitude. P and K fertilizer should all be used as base fertilizer, while N fertilizer should not be completely base fertilizer or complete topdressing, N fertilizer should be 30% base fertilizer and 70% topdressing, and topdressing should be done twice, the first time is 10kg urea per mu (tillering fertilizer) 8 days after rice planting, and the amount of foliar fertilizer is 40% of the total topdressing amount at an interval of 5 Mu and 7 days.

3. Chemical weeding

8 days after transplanting, 100g butachlor was mixed with soil or 1kg was used to clean soil or fertilizer per mu.