No matter whether it is single season or double season white, due to the long growth period, the plant grows vigorously, the demand for water is long, the demand for fertilizer is large, and the management of fertilizer and water is closely related to the yield of chalk.
According to the fertility characteristics of the white, the irrigation should be shallow-deep-shallow.
In order to increase the ground temperature quickly, the depth of irrigation should be 3~4 cm. The water level before pregnancy should be gradually increased to about 15 cm. In the pregnancy period, in order to soften the body, maintain a white shape and fat quality, while controlling the invalid tiller, the water level should be increased to 20 cm. After harvesting in autumn, the water level drops to 3~4 cm. The water level in the dormant period is about 1 cm or the field is wet.
The irrigation law of Xia Wei is basically the same as that of Spring. Single season whitening due to the slightly higher pod area, the water level during pregnancy can be increased to about 30 cm.
The whitening period requires a long period of fertilizer and requires a large amount of fertilizer. Therefore, one must apply the base fertilizer, and the second is to look at the seedlings and apply fertilizer. In the whole process of whitening, according to the experience of each place, sufficient nitrogen fertilizer and appropriate phosphorus and potassium fertilizer should be applied.
The base fertilizer is generally based on soil, fertilizer, green manure or human excrement, or bio-organic fertilizer. 2500 kg of green manure per mu, or 2000 kg of soil fertilizer, or 1500~2000 kg of manure, or 1000 kg of human waste, or about 75 kg of bio-organic fertilizer.
Topdressing is generally divided into seedling fertilizer, seedling fertilizer, relay fertilizer and pregnancy fat. The seedling fertilizer was applied about 10 days after the white planting, and the seedling fertilizer was applied in the tillering stage. The relay fertilizer was applied in the strong vegetative growth from June to July, and the pregnant manure was applied in the middle and late August.
Lifting seedlings per mu (500 kg of manure and urine; stimulating seedlings per mus of manure 1500 kg or urea 12.5 kg; relay fertilizer per mu of manure 1500 kg or compound fertilizer 25 kg, or urea 10 kg, phosphate fertilizer 20 kg, 10 kg of potassium fertilizer; pregnant manure fertilizer per mu of manure 2500 kg or urea 15-20 kg.
Summer planting new carp has a short growth period and requires less fertilizer. It only needs to be applied once a year, and the amount of manure per acre is 1750~2000 kg or urea is 12.5~15 kg. The field to be harvested the following year, the topdressing should be early and fast, and the topdressing period is divided into wax fertilizer, green fertilizer and pregnant fat. The fertilizer was applied in mid-January, and the green fertilizer was applied in mid-February. The pregnant fat was applied in early May. Lianye
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