水稻不同源库类型品种的栽培对策研究

以盐粳2号(库限制型)、汕优3号(源限制型)和IR661(源库互作型)品种为材料,按统—设计分别在江苏省新沂、邗江、建湖、如东、沛县、赣榆、江都等7个县进行栽培对策研究。结果表明:1、穗粒肥施用期对不同类型品种的增产作用不同,盐粳2号以促花肥、汕优3号以粒肥、IR661以保花肥增产效果最大;2、产置构成因素对不同类型品种产量形成的作用不同,盐粳2号以总颖花量、汕优3号以结实率的作用最大,IR661的总颖花置与结实率对产量的作用相近;3、分蘖肥对所有供试品种均有增产作用。

Studies on Ways of Cult tivation of Rice Varieties of Different Types

By using Yangeng No.2 ( sink-limiting type), Xianyou No.3 (sourcelimiting type) and IR 661 (sink- source- interacting type) as test materials, the research was carried out in 7 counties of Jiangsu province to search the way of their cultivation. The main results were as follews: (1) The effect of the time of fertilizer application during the grain-filling stage varied with rice varieties of different types. It was found that an application of fertilizer for promoting spikelet initiation produced the best yield-increasing effect on Yangeng No.2, the most effective fertilizer application was at the grain-filling stage for Xianyou No.3 and as for IR661, an application of fertilizer for retarding spikelet-degeneration was most efficient in inreasing yield. (2) The effect of yield components to yield varied depending on different types of rice varieties. The research showed that the total number of spikelets was the most effective component for Yangeng No.2, the percentage rate of ripened grains played the most important role in the yield-formation for Xianyou No.3 and as for as IR661 was concerned, the effect of the total number of spikelets was similar to that of the percentage rate of ripened rate. (3) It was also observed that an application at tillering had a yield-increasing effect on all the 3 test varieties.