川东南冬水田地区籼稻良种rn高产栽培规律研究

摘要

1978～1996年，以25个早、中籼良种为材料，先后进行18年高产栽培试验，研究了川东南冬水田地区籼稻良种高产栽培规律。结果表明：(1)籼稻高产栽培技术中，品种间播种期、播种量、移栽叶龄、每穴栽秧量和施氮量的差异不显著，而栽插密度和最适有效穗数品种间差异极显著；(2)高产栽插密度分别与施氮量和品种着粒数呈极显著负相关关系，高产最适有效穗数与品种着粒数呈极显著负相关关系，已知品种着粒数就可确定其主要高产栽培技术；(3)品种着粒数决定高产栽培密度和有效穗数，是由于着粒数分别与倒1、2、3叶的长、开张角、披垂度呈显著或极显著正相关，即品种着粒数越高，株型越松散，反之，株型越紧凑。%The high yield cultivation regularity of indica rica varieties in paddy field regions in southeast Sichuan was studied through high y ield cultivation trials using 25 varieties of early-middle indica rice during 1 978 to 1996.The results indicated difference among varieties for sowing date,sow ing rate, transplanting leaves age, the amount of N applied and transplanting se e dlings per hill was not significant(P≤0.05),but significant for the transplani ng hills and the effective panicles per ha for high yield (P≤0.05). Significan tly negative correlations were observed between the high yield transplanting den sity and N application, the grains per panicle of varieties. There were signific antly negative correlation between the effective panicles for high yield and the grains per panicle of varieties.Known a variety's grains per panicle of indica rice,we could make a decision to each variety chief cultivation technologies for high yield, because there were significantly positive correlations between grain s per panicle of varieties and the length, open angle, drooping angle of 1st, 2n d and 3rd leaves from top.In conclusion, the more the verietys grains per pa nicle was，the sparser plant type was.