Regardless of single-season or double-season pods, due to long growth period, lush growth of plants, long period of demand for water, and large demand for fertilizers, the management of fertilizer and water is closely related to the yield of alfalfa.
According to the characteristics of fertility in white fish, irrigation should be shallow-deep-light.
In order to raise the ground temperature faster, the depth of irrigation should be 3-4 cm. The water level before the pregnancy should gradually increase to about 15 cm. Into the pregnancies, in order to make the body soften, maintain a white appearance and tender quality, while controlling ineffective delivery, the water level should be increased to 20 cm. After the harvest, the water level drops to 3-4 cm. During the dormant period, the water level is maintained at about 1 cm or the field is wet.
The summer irrigation law is basically the same with the spring flood. Because of the slightly higher crusting area during the single season, the water level during pregnancy can increase to about 30 cm.
White rice needs a long period of fertilizer, and it needs a large amount of fertilizer. Therefore, one must apply enough basic fertilizer, and the other must see seedlings in divided fertilizers and formula fertilization. In the whole fertility process, according to local experience, it is necessary to apply adequate nitrogen fertilizer and appropriate phosphorus and potassium fertilizers.
Basal fertilizers are generally made up of soil miscellaneous fertilizers, manure fertilizers, green manure or human waste, or bioorganic compound fertilizers. Each acre can be applied to 2,500 kg of green manure, or 2,000 tons of landfilled manure, or 1500-2000 kilograms of manure, or 1000 kilograms of human waste, or about 75 kilograms of bio-organic fertilizer.
Fertilizers are generally divided into Miaofei, Huanmiao, relay fertilizer and pregnant manure. Miaomiao fertilizer is applied about 10 days after the planting of the alfalfa and white rice, and the priming fertilizer is applied during the tillering period. The relay fertilizer is applied during the vigorous nutrition growth from June to July, and the pregnant fertilizer is applied during the middle and late August.
Miao Fei applied 500 kilos of manure per acre; rushed fertilizer applied 1,500 kilograms of urine per mu or urea 12.5 kilograms; relay fertilizer applied urine 1500 kilograms per person or compound fertilizer 25 kilograms, or urea 10 kilograms, phosphate fertilizer 20 kg, 10 kg of potash; Pregnancy is applied to 2500 kg of urine or 15-20 kg of urea per mu.
Summer planting new pods has a short growth period and requires less fertilizer. It is only necessary to apply once-in-one fertilization, and 1750-2000 kg of urine or 12.5-15 kg of urea per mu. The plots to be harvested the following year should be top-dressed early and fast. During the top-dressing period, they are divided into wax fertilizers, green manures, and pregnant manures. The wax fertilizer was chased in mid-January and returned to Qingfei in the middle of February. The pregnant manure was applied in early May.
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