优质杂交中稻渝香优203产量的地域差异及其磷钾高效施用量的研究

Yield Variation of Different Places and Optimize Application Amount of Phosphate and Potassium of Mid-season Hybrid Rice in Southwest China

以优质高产新品种渝香优203为材料,在西南稻区7个生态点采用相同的10个磷、钾施用量处理,研究稻谷产量和磷钾高效施用量与环境条件及施肥的关系.结果表明,7个试验点的各施肥处理间产量差异显著,10个施肥处理平均产量宾川点最高;7个试验点平均产量以N 150 P75K90处理最高,平衡施肥是获得水稻高产的重要技术措施.经多元逐步回归分析,杂交中稻磷、钾高效施用量与试验所处的地理位置和土壤养分呈极显著线性关系,决定系数为0.9951 ～0.9996.此结果可作为制定各地水稻高产高效相应的磷钾高效施肥量的科学依据.

Taken Yuxiang-you 203 as tested materials,the vadations of yield and the optimize application amount of the P2O5and K2O of mid-season hybrid rice at different ecological sites were studied with 10 treatments of P2Osand K2O application amount,and tested data were analyzed by the variance,regression.The results showed that there were significant differences of grain yield among 10 treatments of P2O5 and K2O application amount for every tested site,Binchuan was the highest yield point among 7 tested sites for the mean of 10 fertilizer treatments; N150 P75 K90 was the highest yield trcatment among 10 treatments of P2 O5 and K2O application for mean of 7 tested sites,and balanced fertilization was a important technical measure for rice high yield.The result of multiple stepwise regression analysis indicated that the optimize application amount of P2O5and K2O of mid-season hybrid rice were significantly affected by different ecological sites and nutrient status of soil,and its determination coefficient ranged fiom 0.9951-0.9996,which would be used as the scientific basis for the determination of the efficient amount applied of P2O5and K2O for full scale rice cultivation.