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本书简要阐述了不同覆盖物利用下作物的生长发育研究进展,总结了种植密度因子调控下的作物生理代谢及产量构成;从当年全膜双垄沟播玉米收获后残留旧膜的循环利用出发,论述分析了旱地胡麻生长发育状况、灌浆特征、生理生态特性、土壤水热变化特征、籽粒产量及水分利用效率等,以期为旧膜利用多样化及旱地胡麻高产栽培技术提供理论依据和技术支持,期冀为农业科研工作者、农业推广人员和胡麻生产者提供一定的参考。