水稻品种江优919与江两优3号机插秧的适宜密度

Appropriate Planting Density for Machine-transplanted Seedlings of Rice with Jiangyou 919 and Jiangliangyou No.3

为确定江优919与江两优3号水稻品种在贵州省不同生态下的适宜机插秧密度,在黄平、江口、三穗县开展了1.1112万穴/667m2、1.2346万穴/667m2、1.39万穴/667m2、1.587万穴/667m2 4个不同密度试验。结果表明:江优919与江两优3号生育期不同,黄平县江优919生育期为142d,江两优3号为141d;江口县江优919生育期为157d,江两优3号为152d,两地江优919比江两优3号生育期长,生育期与栽插密度无关。黄平县江优919茎蘖数约高于江两优3号,江口县无明显差异。农艺性状,江优919有效穗数、实粒数、千粒重约高于江两优3号,不同密度下以1.39万穴/667m2有效穗数、实粒数、千粒重最高。各地均表现出江优919单产高于江两优3号,单产分别为591.32kg/667m2和574.69kg/667m2。不同密度下黄平县、江口县以1.39万穴/667m2单产最高,三穗县则以1.2346万穴/667m2单产最高。说明,茬口矛盾较大的地区宜选择江两优3号,茬口矛盾较小地区宜选择江优919;不同地区江优919与江两优3号适宜机插秧密度不同,黄平县、江口县及相似生态条件下以1.39万穴/667m2为宜,三穗县及相似生态条件下以1.2346万穴/667m2为宜。

Four machine-transplanting densities of 11.112/667m^2 thousand holes/667m^2,12.346 thousand holes/667m^2,13.900 thousand holes/667m^2 and 15.870 thousand holes/667m^2 were used for cultivation test of Jiangyou 919 and Jiangliangyou No.3in Huangping,Sansui and Jiangkou County to determine the appropriate machine-transplanting density of Jiangyou 919 and Jiangliangyou No.3under different ecology in Guizhou.Results：The growth period of Jiangyou 919 and Jiangliangyou No.3in Huangping and Jiangkou County is 142 dand 157d,and 141 dand 152drespectively.There is difference in growth period between two varieties but growth period does not related with machine-transplanting density.The tiller number of Jiangyou 919 is higher than Jiangliangyou No.3in Huangping County but there is no obvious difference in tiller number between Jiangyou 919 and Jiangliangyou No.3in Jiangkou County.The effective spikes,filled grains and 1000-grain weight of Jiangyou 919 is higher than Jiangliangyou No.3and the effective spikes,filled grains and 1000-grain weight of two rice varieties under13.900 thousand holes/667m^2 is the highest among different machine-transplanting density treatments.The yield of Jiangyou 919 and Jiangliangyou No.3is 591.32kg/667m^2 and 574.69kg/667m^2 respectively.The highest yield of Jiangyou 919 and Jiangliangyou No.3can be gained under 13.900 thousand holes/667m^2 of planting density in Huangping and Jiangkou County and under 12.346 thousand holes/667m^2 of planting density in Sansui County.In conclusion,Jiangliangyou No.3should be used in regions with more contraction in crop rotation but Jiangyou 919 should be used in regions with less contraction in crop rotation.The appropriate machine-transplanting density of Jiangyou 919 and Jiangliangyou No.3is 13.900 thousand holes/667m^2 in Huangping County,Jiangkou County and other regions with the similar ecological condition but the appropriate machine-transplanting density of Jiangyou 919 and Jiangliangyou No.3is 12.346 thousand holes/667m^2 in Sansui County and other regions with the similar ecological condition.