指出以水稻为主的稻麦两熟地区，评价钾肥效益应以轮作周期为基础。
The paper also revealed that economic benefit of applied K should be evaluated on the basis of the rotation period in the rice-wheat cropping areas.
她的研究结果表明，减少排放要比只是减少氮肥的使用和改变作物轮作周期复杂得多。
Her results show that reducing emissions is more complicated than just cutting back on nitrogen fertilizers and changing crop rotation cycles.
在黄土丘陵区要求林草与农作物地在轮作周期内的总耗水量与有效雨量（降雨量与径流深之差）持平。
It is necessery that the total consumptive use of water in the rotation period is equal to the total effective precipitation(pre- cipitation minus runoff depth)in the loess hilly region.
施钾能使轮作周期中的钾平衡系数达到0 95 ，施钾且小麦秸秆还田能使轮作周期中的钾平衡系数达到1 1 5。
The Potassium balance coefficient reached 0.95 with the application of Potassium, and 1.15 with Potassium application and straw return…
施钾能使轮作周期中的钾平衡系数达到0 95 ，施钾且小麦秸秆还田能使轮作周期中的钾平衡系数达到1 1 5。
The Potassium balance coefficient reached 0.95 with the application of Potassium, and 1.15 with Potassium application and straw return…
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