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一年两熟制是美国伊利诺斯(ILLinois)州南部多数地区农业的一个组成部分。最普遍的习惯做法是夏初收获一季冬小麦,接着种植大豆到秋季收获。这种习惯做法的效果通常取决于大豆播种后土壤可利用的水分含量。偏远的北部地区推行这种习惯做法不很稳妥。改进种植技术。包括免耕。将一年两熟制往北发展到远至中部玉米带,至少会有一些效果。但按现在这种方式种植,北移后大
Two crops a year are part and parcel of agriculture in most parts of southern Illinois. The most common practice is to harvest a winter wheat harvest in early summer, followed by planting soybeans to harvest in autumn. The effect of this habitual practice usually depends on the available moisture content of soils after sowing. It is not very safe to practice this practice in remote northern areas. Improve planting techniques. Includes no tillage. Two crops a year northward development to as far as the central corn belt, at least there will be some results. However, according to the current way of planting, moving north after the big