鄂南红壤性水稻土双晚杂交稻氮磷钾经济配比施用研究

在发育于第四纪红色粘土的鄂南红壤性水稻土上,以三要素多水平优化设计方案对双晚杂交稻进行田间实验和盆栽实验,求得该土壤上双晚杂交稻三要素的经济用肥量分别为每666.7 m~2:16 kg N,8 kg P_2O_5,12 kg K_2O,三者比例为2.0:1:1.5。株高、穗长、茎杆重、谷/草和穗粒效等因素的改善对提高杂交双晚产量有重要作用。

A STUDY ON THE FORMULA FERTILIZATION TO THE HYBRID LATE RICE ON A REDIC PADDY SOIL IN SOUTHERN HUBEI PROVINCE

Both field and pot culture experiments, multiple factors and levels involving were conducted on the red paddy soil. The data showed that, the most appropriate application rates of nitrogen, phosphorus and potassium fertilizers to the crossbred late rice are 16,8 and 2 kg per 666.7m~2 respectively, giving a ratio of 2.0 to 1.0 to 1.5. It was also demonstrated that plant height of ears length, grain per ear straw weight and grain to straw ration are all mporatant factors to the yield of the hybrid late rice.