After placing 20-30 cm of soil on the bottom of the dunghill, soil is piled on the side of the manure and piled up to a certain height. The top of the dunghill should be covered with soil. The proportion of excreta is preferably 1:2 or 1:3, and it must not exceed 1:5.
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If too much soil is added, the following adverse effects will occur:
First, poor ventilation of the dung heap, weakened microbial activity, is not conducive to the decomposition of organic matter and nutrient release.
Second, diluted nutrient concentration, fertilizer effect is small.
Third, the temperature of fecal fermentation is low, can not kill bacteria, eggs and grass seeds.
Fourth, the increase in fertilizer volume has reduced labor productivity and economic efficiency.