种植每种作物,都有一个合适的密度范围,太密、太稀,都对产量不利。如果在恒定的条件下,确定合理密度并不难,只需种植几个密度高低不同的田块,对比一下就可以知道哪个密度产量最高。但是,事实上并不是那么简单,农业生产条件千差万 Each crop is planted with a suitable range of densities, too dense and too dilute, to be detrimental to yield. If under constant conditions, to determine the reasonable density is not difficult, just planted a few different density of plots, compare to know which density yield the highest. However, in fact it is not that simple, and the conditions of agricultural production vary from place to place