论文部分内容阅读
在碳酸盐黑钙土上连续进行定位试验。结果表明，甜菜不同轮作年限的土壤有机质、氮、磷、钾及微量元素都发生了变化。在５年轮作的基础上，轮作年限缩短，土壤养分随之下降，特别是氮、钾、硼、锌等元素都表现出了同一规律性，即与轮作时间成正比。同时，轮作年限不同，甜菜产质量也表现出了一定的差异，５年轮作根产量高于３、４年轮作，而且不同轮作年限的产质量变化与土壤养分变化趋势一致。
Continuous positioning test on carbonate chernozem. The results showed that soil organic matter, nitrogen, phosphorus, potassium and trace elements changed under different rotation stages of sugar beet. Based on the 5-year crop rotation, the shortening of the crop rotation and the decrease of soil nutrients, especially the nitrogen, potassium, boron and zinc all show the same regularity, that is, the rotation time. At the same time, the yield and quality of sugar beet also showed some differences with different rotation years. The root yield of five years of rotation was higher than that of three or four years of rotation, and the change of yield and quality was consistent with that of soil nutrient under different rotation years.