Better irrigation can dramatically improve crop yield and about 40% of the world's food supply is currently derived from irrigated land.
更好的灌溉可以显著提高作物产量；目前，全球约40%的粮食供应都来自于灌溉地。
But no matter how much we maximize crop yield per acre, the limiting factor for food production is land.
但是不管我们如何最大化粮食亩产量，最大的制约因素还是土地。
In land scarce area, methods to increase cropping index, increase crop yield and increase planting area of wheat and sweat potato are adopted in order to increase food energy production.
在人多地少地区，粮食、饲料的供应通过增加复种、提高单产以及增加甘薯、小麦种植面积来解决。
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