不同耕作方式对超级杂交稻两优培九产量形成和养分吸收的影响

Effects of Different Tillage and Cultivation Methods on Yield Formation and Nutrient Uptake of Super Hybrid Rice

为了探明免耕对杂交水稻产量的影响．在前3年定位试验的基础上，于2006-2007年在长沙以两优培九为材料进行了翻耕移栽、翻耕直播、免耕移栽和免耕直播4种耕作方式的田间比较试验。结果表明在直播条件下，免耕稻与翻耕稻氮素的吸收量相似，而磷素和钾素吸收量分别比翻耕稻高11．52％和10．44％；在移栽条件下，免耕稻氮素和磷素的吸收量分别比翻耕稻高13．52％和0．67％，但钾素的吸收量比翻耕稻低12．36％。无论在移栽或在直播条件下．免耕稻与翻耕稻产量差异不显著．但无论在翻耕或在免耕条件下．直播稻产量略高于移栽稻，2006年和2007年试验结果一致。

In order to clarify the effect of no-tillage on yield and nutrient uptake of hybrid rice,a field experiment with four treatments . tillage ＋ transplanting （TT）, tillage ＋ direct-seeding （TD）, no-tillage ＋ transplanting （NT） and no-tillage ＋ direct-seeding （ND）, was conducted with super hybrid rice Liangyoupeijiu in Changsha in 2006 and 2007. Under directseeding condition,the total N absorption amount was similar between TD rice and ND rice,while the total P and K absorption amount of ND rice were 11.52% and 10. 44% higher than those of TD rice. Under transplanting condition,the total N and P absorption amount of NT rice were 13. 52% and 0. 67% higher than those of TT rice,while the total K absorption amount of NT rice was 12. 36% lower than that of TT rice. Under transplanting and direct-seeding condition, the difference in yield was no significant between no-tillage rice and tillage rice,while the yield of direct-seeding rice was a little higher than transplanting rice under both tillage and no-tillage condition,and the same trend was observed in 2006 and 2007.