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据有关调查统计资料显示,1962年我国每公斤氮可增产稻谷量15—18公斤;到1981年,每公斤氮素所增产的稻谷量下降到10—12公斤;到1994年,每公斤氮素所增产的稻谷量下降到6—8公斤。从这组统计数据中,人们不难看出:农作物的“胃口”变得越来越大了。一、农作物“胃口”越来越大的原因 1重施化肥,轻施农肥。由于积造农家肥劳动强度大,费时费力,且农家肥供应强度低,肥效迟缓,而化肥供应强度高,肥效迅速,且使用方
According to the survey statistics, in 1962 China’s kilograms of nitrogen per kilogram of rice yield increased by 15-18 kilograms; by 1981, the amount of rice per kilogram of nitrogen production decreased to 10-12 kilograms; by 1994, nitrogen per kilogram The increase in the amount of rice dropped to 6-8 kg. From this set of statistics, one can easily see that crop “appetite” is getting bigger and bigger. First, crop “appetite ” The reason for the growing 1 re-fertilizers, light manure. As a result of the accumulation of farmhouse labor intensity, time-consuming and labor-intensive, and poor supply of farmyard manure, fertilizer slow, and high strength fertilizer supply, fertilizer efficiency, and the use of Fang