Selecting productive stem per ha can get better results from higher stem height on the condition of fixing other traits.
以有效茎为选择指标时，可在茎较高中选择鲜蔗产量较高的材料。
Acquiring the territory would double the size of the United States at a cost in the currency of the day of less than 3 cents per acre (7 cents per ha).
购买这片土地将美国的领土扩大了一倍，按当时货币算，花费大约为每英亩3美分(每公顷7美分)。
The effect of plant density on grain yield was also not significant for rice variety tested, the optimum plant density was about300,000 to375,000 hills per ha .
供试水稻品种的植株密度对籽粒产量的影响也未达到显著水平，最佳植株密度为每公顷300，000~75，000篼。
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