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在综合几种旱田作物在轮作中地位各专项研究的基础上,现提出以下科学轮作体系。科学轮作体系应在4年以上,如有向日葵参加,则应只少5年。2.各作物允许连作年份极限3.茬口的产量指数根据4年3点的数据计算出各茬口产量指数(%),以比较各茬口在轮作中的产量效应。作物茬口好坏是对后作而言,故有选择性;不同地区土壤肥力不同茬口反应也不同,如向日葵茬在肥力较高的沈阳、营口则为好茬,
Based on the special studies on the status of several dryland crops in the rotation, the following scientific rotation system is proposed. Scientific rotation system should be more than 4 years, if sunflower participation, it should be only 5 years. 2. Each crop allowed continuous cropping year limit 3. Yield index of stubble Crop yield index (%) of stubble crop was calculated based on data of 3 points in 4 years to compare crop yield effect of stubble crop. Crop stubble is good or bad for aftercrops, so there is selectivity; different regions of soil fertility stubble reactors are different, such as sunflower stubble in Shenyang Shenyang, Yingkou is a good crop,