湖南农业大学学报（自然科学版）2016，Vol.42Issue(5)：465-471,7.
分蘖期干旱对不同施氮量和移栽密度下杂交稻产量及稻米品质的影响
Effect of drought stress during tillering period on grain yield and rice quality of hybrid rice under different nitrogen rates and hill densities
摘要
Abstract
In this experiment, Hybrid rice Jingyou127 was used as material, two irrigation regimes of conventional irrigation (CI) and drought stress during tillering period (DSTP), two nitrogen (N) levels of medium N rate (120 kg/hm2) and high N rate (180 kg/hm2), and three hill densities of low hill density (12 hill per 1 m2, LH) and medium hill density (16.5 hill per 1 m2, MH) and high hill density (22.5 hill per 1 m2, HH) were designed, to investigate how nitrogen rates and hill density affect grain yield and quality of hybrid rice under drought stress during tillering period. The result showed that there was no significant difference in grain yield between CI (10.72 t/hm2) and DSTP (11.01 t/hm2) in 2014, whereas the difference (6.2%) between DSTP (9.84 t/hm2) and CI (10.50 t/hm2) was significant in 2015, the decrease of grain yield of DSTP was due to the decrease of effective ears of grain number per panicle and the weight of dry matter. Grain yield of DSTP increased with N rate increasing, while grain yield of CI decreased with N rate increasing. Grain yield increased with hill density increasing, irrespective of CI or DSTP regime, that was due to the increase of effective ears and the weight of dry matter. Compared with CI, DSTP was not only significantly lower in rate of chalky grains and degree of chalkiness by 32.0% to 46.5% and 20.0% to 34.8%, respectively, but also had similar or higher quality of milling, cooking and eating. Our results suggest that increasing N rate and hill density can obviously decrease yield loss resulted from drought stress during tillering period. The N application rate of 180 kg/hm2 with hill density of 22.5 hill per 1 m2 are the optimal choice in the rice production area where the drought occur frequently in tillering period.关键词
杂交稻/分蘖期干旱/施氮量/移栽密度/稻米品质Key words
hybrid rice/tillering stage drought/nitrogen fertilizer rate/transplanting density/rice quality分类
农业科技引用本文复制引用
蒋鹏,熊洪,张林,朱永川,周兴兵,刘茂,郭晓艺,徐富贤..分蘖期干旱对不同施氮量和移栽密度下杂交稻产量及稻米品质的影响[J].湖南农业大学学报（自然科学版）,2016,42(5):465-471,7.基金项目
四川省农业科学院青年基金项目(2014CXSF-038)；四川省农业科学院优秀论文基金项目(201bLWJJ-009) （2014CXSF-038）
