It is required that the surface temperature should be stabilized at 9℃~ 10℃ before sowing, and sowing should be carried out in most parts of North China in the middle and late April. As long as the surface is not frozen, the sooner you plant it, the better. Early planting can make the root system developed and grow healthily. If sowing early, it is better to cover with plastic film, which can increase the yield by 10%~30%. ?
It is necessary to adjust the watering amount in time to meet the water requirement of yam growth. When the water consumption is large, pay attention to drainage, and don't flood the yam plant, so as to avoid the whole plant "soaking to death". After beginning of autumn, in order to thicken the tuber of yam, water can be poured once.
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cultivate
Planting requires a lot of fertilizer. Every 1 0,000 kg tuber needs to absorb about 4.32kg pure nitrogen,10.07 kg phosphorus pentoxide and 5.38kg potassium oxide. Yam is chlorine-free, so potassium chloride should not be used, and organic fertilizer should be applied again.
The base fertilizer in high-yield fields needs to be applied with 45-75 cubic meters of decomposed organic fertilizer, 250-300 kilograms of urea and 0/50 kilograms of potassium sulfate/kloc per hectare. Before soil preparation, it should be spread out in the field and ploughed in the soil layer of about 25 cm.
65438+1from late June to165438+1June, when all the stems and leaves wither, the tubers are harvested. Tubers are mainly stored to keep warm and prevent freezing. The suitable temperature is 2-4℃ and the relative humidity is 80-85%. It can be stored, buried or cellar, etc. In the warm south of China and the Yangtze River valley, it can be listed with the harvest. Etiquette and righteousness must be mature and harvested.
References:
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