作　　者： ; ; ; ; ; ;

机构地区： 中国科学院亚热带农业生态研究所

出　　处： 《中国生态农业学报》 2007年第5期30-33,共4页

摘　　要： 通过2年裂区试验,研究了不同灌溉方式和施肥条件下稻草还田对土壤供N特征及产量的影响。结果表明:上年晚稻草还田提高了翌年早稻期间土壤NH4+-N浓度;配施N肥后新鲜早稻草还田也增加了晚稻期间土壤NH4+-N浓度,但不施N肥淹水灌溉下稻草还田土壤NH4+-N浓度低于移走稻草的处理,间歇灌溉下稻草还田处理土壤NH4+-N浓度仍高于移走稻草的处理。稻草还田能增加水稻产量,早稻增产幅度为6.85%,晚稻为8.17%;施用N肥后稻草增产效应显著高于不施N肥处理,分别增产9.18%和5.83%。稻草还田主要通过影响有效穗数来影响产量,但水稻生长季节、灌溉模式和施肥条件对稻草还田的增产效应存在交互作用,早稻以连续淹水灌溉条件下稻草还田的增产效果最大,而晚稻则以间歇灌溉条件下的效果最佳。 A 2-year field experiment was conducted to study the effects of rice straw incorporation into the soil on soil N supply and grain yield of rice under different irrigation systems. Results show that in early rice, late rice straw incorporation in last year increases soil NH^＋4-N irrespective of whichever irrigation system or nitrogen fertilization is adopted. In late rice,straw incorporation of the early rice adds NH^＋4 -N to the soil only with N supply. However,with straw incorporation and N omission, soil NH^＋4 -N decreases under continuous flooding and increases under intermittent irrigation. Straw incorporation increases grain yield by 6.85 % in early rice, 8.17% in later rice, 9.18% with N supply and 5.83% with N omission. The development of greater number of panicles is the main reason for rice grain yield increase under straw incorporation. With straw incorporation, grain yield is highest under continuous flooding for early rice, while it is highest under intermittent irrigation for late rice.

关 键 词： 稻草还田 灌溉方式 肥 铵态氮 水稻产量 早稻 晚稻

领　　域： [农业科学] [农业科学]