In order to improve the effect of straw returning and avoid possible harmful factors, the following points should be noted when returning straw:
1, with the application of nitrogen and phosphorus fertilizers
When the straw is directly returned to the field, the contradiction between crops and microorganisms competing for available nutrients, especially the phenomenon of nitrogen fight, can be solved by supplementing chemical fertilizers.
2, buried method
Crop stalks are best cut and ploughed with disc harrows. If there is not enough moisture in the soil after overturning, it should be combined with watering. Combine it with sowing in the vicinity of sowing to promote decomposition and decomposition.
3, buried time
In the period when the straw is returned to the field, it is generally ploughed into the soil immediately after the crop is harvested to avoid the loss of moisture and the indissolubleness. In addition, when the dry land soil moisture content in the dry land is controlled at 60% of field capacity, it is appropriate. If the moisture content exceeds 150% due to poor ventilation, nitrogen mineralization of the straw can easily cause denitrification and loss of nitrogen.
4, the amount of application
In the case of a shortage of fertilizers in the thin field, the amount of straw should not be excessive when the straw is returned to the field when the sowing time is relatively short. However, in the case of more chemical fertilizers, fertilizer lands, and far away from the sowing date, the amount can be increased or Tian Chao pressure. The general straw application rate is 300-400 kg per mu.
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