双季抛栽稻高产调控技术研究

研究了将增加穗肥比重、提早晒田和喷施GA33项技术组装成综合高产栽培技术 ,应用于双季抛栽稻的大田调控 ,对抛栽稻的产量及产量形成的影响。结果表明 ,与常规栽培技术比较 ,综合高产栽培技术能控制无效分蘖的生长 ,降低最高苗数 ,提高成穗率 ;增加中后期特别是抽穗后的干物质生产 ,提高总干物重及其在穗部的分配比例 ;增加中后期的养分吸收量和总吸收量 ;在稳定穗数的基础上 ,增加每穗粒数和结实率 ,最终提高产量 ,早、晚稻分别增产 1 5.0 0 %和 2 0 .62 %。

Study on High-yielding Technique of Double Cropping Rice by Seedling-throwing Culture

The integrated high-yielding technique which consists of increasing the proportion of head dressing, moving up the date of draining and spraying GA\-3 is applied to the field management of double cropping rice by seedling-throwing culture, and its effects on yield and yield components of rice are studied in this paper. The results showed that compared with the conventional culture technique (CK), the above integrated high-yielding technique can inhibit the growth of invalid tillers, reduce the maximum of seedling, enhance the rate of earbearing tiller, increase the production of dry matter during medium and late period (especially after heading), raise the total weight of dry matter and its distributive proportion in the ear, increase the nutrition (N and K) absorption during medium and late period as well as the total absorption, increase the number of grain per panicle and setting rate on the condition of steadying the number of panicle, and finally increase the yield of early rice and late rice by 15.00% and 20.62% respectively.