proper rotation

Appropriate-scale-operation, farmland capital construction, intensive cultivation and proper rotation of crops are the ways to improve energy efficiency.

通过适度规模经营、农田基本建设、精耕细作和合理轮作，可以提高农田投能效率。

Based on above results, proper use of manure, intercropping or rotation of crops with different Fe-efficiency are two important measures to improve and remain Fe availability, in soil.

有机肥的合理施用和铁效率差异性植物间的轮作或间作是增加、维系土壤铁有效性的重要农艺措施。

Comparing the PPM and ACRS proper motions, which are constructed on the FK5 system, with those of the Hipparcos, an interiorly nonrigid rotation existing in the FK5 proper-motion system is detected.

用建立在FK5系统上的PPM和ACRS自行与依巴谷自行比较，发现FK5自行系统内部存在非刚性运动；