免耕覆草旱作条件下水稻的生长特性

 通过田间定位试验，研究了免耕覆草旱作、免耕裸地旱作和免耕水作3种栽培方式对晚稻生长状况和产量的影响。结果表明，免耕覆草旱作水稻产量与免耕水作差异不大，但两者明显高于免耕裸地旱作。与免耕裸地旱作相比，免耕覆草旱作明显提高水稻的有效穗数和每穴总粒数。免耕覆草旱作水稻可获得与免耕水作相当的地上部干物质量。与免耕水作相比，免耕旱作显著降低抽穗期水稻功能叶叶面积。与免耕裸地旱作相比，免耕覆草旱作明显提高灌浆期水稻总根长和根数。

Growth Characteristics and Yield of Late-Season Rice under No-tillage and Non-Flooded Cultivation with Straw Mulching

A long-term field experiment (started at 2003) was conducted to determine the effects of different rice cultivation methods on growth characteristics and yield of late-season rice under double-rice cropping system in seasonal drought region of southeast China (Yujiang County, Jiangxi Province). The rice cultivation included no-tillage and non-flooded rice cultivation with straw mulching (N-SM), no-tillage and non-flooded rice cultivation without straw mulching (N-ZM), and no-tillage and flooded rice cultivation (N-F). The results obtained in 2007 showed that there was no significant difference in rice grain yield between N-SM and N-F treatments. However, the rice grain yields under N-SM and N-F treatments were significantly higher than that under N-ZM treatment, respectively. The effective panicle number and total grain number per hill of rice were significantly higher under N-SM treatment than under N-ZM treatment. The above-ground dry matter of rice in N-SM treatment was similar with that in N-F treatment. Compared to N-F treatment, N-ZM and N-SM treatments significantly decreased the leaf area at the heading stage. Compared with N-ZM treatment, N-SM treatment could significantly increase total length and number of roots at the grain-filling stage.