赣北植棉区棉油双直播模式的油菜播期研究

为探明适合赣北植棉区油棉双直播一年两熟模式下并有利于棉花与油菜生产轻简高效的油菜适宜播种期。于2019~2020年在赣北地区设6个不同油菜播种期处理,测定各处理油菜生长发育指标、单株干物质积累量、产量及经济性状,探究一定范围内推迟播期对油菜生长发育、干物质积累、产量及经济性状的影响。结果表明,T 1处理(10月17日播种)油菜籽产量最高,达到2701.95 kg/hm 2,较T 6处理(11月21日播种)显著增产225.56%,油菜干物质积累量与单株产量T 1处理较T 5和T 6处理显著增加,但单株角果数与千粒重各处理间差异不显著。综上所述,在对油菜生长发育与产量不产生显著负面影响的前提下,并考虑棉花收获与油菜播种环节的轻简高效,赣北植棉区油棉双直播模式油菜适宜播期推迟至10月底是可行的。

Study on Safe Sowing Date of Rapeseed in Cotton and Rape Double Direct Sowing Mode in the Cotton Planting of Northern Jiangxi

In order to find out the suitable sowing date for light,simple and efficient production of cotton and rape under rape cotton double direct seeding rotation mode in northern Jiangxi.The experiment set up 6 different rape sowing time treatments in northern Jiangxi from 2019 to 2020 to determine the growth and development indicators of each treatment,dry matter accumulation of each plant,yield and economic characters of rape,and explore the efforts of delaying the sowing date on the growth and development of rape within a certain range,dry matter accumulation per plant,yield and economic characters of rape.The results showed that the rape yield of T 1 treatment(sowed on October 17)was the highest,reaching 2701.95 kg/hm 2,which was 225.56%higher than that of T 6 treatment(sowed on November 21),the dry matter accumulation and yield per plant of T 1 treatment were significantly higher than that of T 5 and T 6 treatment,but the pod number per plant and 1000 grain weight of each treatment were not significantly different.In conclusion,under the premise of no significant negative impact on the growth and yield of rape,and considering the light,simple and efficient aspects of cotton harvesting and rape sowing,it is feasible to postpone the sowing date of rape to the end of October under the mode of rape cotton double direct seeding in northern Jiangxi cotton region.