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近几年来,我县各种作物的化肥特别是碳酸氢铵的用量逐年增加,1970年全县平均亩施碳铵24斤,1971年亩施30斤,1972年猛增至80斤,1973年又增至133斤。前年同1970年相比,碳铵亩施量增加4.5倍,粮食平均亩产只增加103斤,即增长11％,其中1972年碳铵亩施量比上年增加167％,粮食亩产增加3.2％,1973年碳铵亩施量比上年增加66％,粮食亩产只增加0.39％。很明显,单位面积化肥用量的大量增加,并不意味着粮食单产也相应地大幅度增加。为什
In recent years, the amount of fertilizers, especially ammonium bicarbonate, of various crops in our county has been increasing year by year. In 1970, the average acreage of ammonium bicarbonate in the county was 24 kg, and in 1971, it was 30 kg. In 1972, it soared to 80 kg in 1973 Increased to 133 pounds. Compared with 1970, the amount of ammonium bicarbonate applied in the previous year increased 4.5 times. The average grain yield per mu only increased by 103 kg, or 11%, of which the amount of ammonium bicarbonate increased by 167% over the previous year in 1972 and that of grain increased by 3.2% In 1973, the amount of ammonium bicarbonate applied increased by 66% over the previous year and grain output per mu only increased by 0.39%. Obviously, the substantial increase in fertilizer use per unit area does not mean that the yield per unit area of grain has also increased substantially. why