长期秸秆覆盖免耕对土壤某些理化性质及玉米产量的影响

被引:119
作者
张志国
徐琪
R.L.Blevins
机构
[1] 山东农业大学!泰安
[2] 不详
[3] 中国科学院南京土壤研究所!南京
[4] UniversityofKentucky!Lexington
[5] Ky
[6] USA
关键词
免耕; 持续性农业; 土壤理化性质; 玉米产量;
D O I
暂无
中图分类号
S157.4 [农业技术措施];
学科分类号
摘要
免耕农作是一项重要的农业生态管理系统。长期秸秆覆盖免耕条件下土壤性质的变化及作物产量可以反映这一系统的可持续性。研究表明,长期(1970年—1994年)免耕与犁耕相比土壤容重并未增加;而表层(0—5cm)土壤有机C和有机N显著增加;并有随N肥施用量增加而增加的趋势。土壤pH随NH4NO3化肥施用量的增加而明显降低。免耕表层土壤的交换性Ca、Mg、K和可提取P与犁耕比较有明显的表聚现象。交换性Ca、Mg、及可提取P随NH4NO3施用量的增加而减少。交换性K的分布则不受N肥施用量的影响,从1984至1994年,免耕玉米的产量显著高于犁耕玉米的产量,从1970至1982年犁耕玉米的产量略高于免耕,但并不显著。
引用
收藏
页码:384 / 391
页数:8
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