... raise the multiple cropping index ==> 提高复种指数 raise the per unit yield ==> 提高单位面积产量 raise to a power ==> 自乘 ...
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We must do everything to raise the per unit yield.
我们要千方百计提高单位面积产量。
According to investigate, the element zinc is very poor in soil of most area at present, which has affected crops to raise the per unit yield their disease resistance.
根据调查，目前多数地区土壤中锌元素严重贫乏，影响了作物单位面积产量的提高和抗病性。
The covered stubble could increase water utilization and the capability of storage water and, it could prompt the root growth of spring corn obviously and raise the per unit yield of 32.1%.
秸秆覆盖可以显著地增加土壤水分利用率和蓄水量，促进玉米根系生长，提高玉米单产32.1%。
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