Fertilizer and Water Management in Rice High-yielding Cultivation

In the high yield of rice, the application of fertilizer and water is the core, and the application of fertilizer and water should be determined according to the characteristics of fertilizer demand of varieties, soil fertility, planting time and so on. Generally, 100 kg of rice requires 2 kg of pure N, 1.2 kg of pure P and 1.5 kg of pure K. Special measures are put forward for the application of fertilizer and water:

First, after transplanting rice for 10 days, fertilizer should be applied in a timely manner, requiring that N fertilizer per mu account for 85% of N fertilizer, 90% of N fertilizer, 100% of P fertilizer and 30% of potash fertilizer, so as to ensure that rice seedlings are planted for 25 min for 30 days, and the number of effective tillers is about 28-320000.

Second, in the middle and later stage of growth, it is mainly to apply panicle fertilizer, and it is suitable to apply panicle fertilizer for 45 minutes after planting in the field. The application of panicle fertilizer depends on variety, soil fertility, the amount of fertilizer used in the early stage, the size of seedling population and the depth of color grade. The fields with less than medium soil fertility, insufficient amount of fertilizer used in the early stage and small population are the key points of applying panicle fertilizer. It is required to apply 8 kilograms of urea and 15 kilograms of potash fertilizer per mu. The application of panicle fertilizer depends on seedling application, re-application in areas with poor growth potential, and little or no application of benefits. The fields with good growth, large population, deep leaves and more fertilizer in the early stage will not apply N fertilizer, but mainly apply potash fertilizer, applying 15kg potash fertilizer per mu. It is necessary to regulate the growth of nitrogen metabolism of rice plants in time, balance nutrients and achieve robust growth.

Third, water slurry management: growing in shallow water in the early stage, draining water and drying the field in time for tillering. Drying method: in line with the mud field can be re-sun, sun to the field surface cortex white root exposure, color grade fade is appropriate. The sand skin and stone bottom can only dry the field, waiting for the soil to be a little hard. In the middle and later stage, the water slurry management should be based on shallow water and wetting, and dry and wet alternately in the later stage. To achieve root and leaf protection, grain and weight gain.

The management of deep-water seedling protection is prohibited during the growing period of rice, which leads to poor root development, premature senescence and decrease of grain weight.