播期对豫东黄潮土区小麦群体及产量的影响

为了给小麦新品种郑麦7698、众麦998提供适宜播期,以郑麦7698、众麦998为材料研究了不同播期对群体及产量的影响.结果表明,不同播期间冬前分蘖差异大,春季差异减小,但这种差异一直维持到成熟期；播期与穗数、产量呈显著的负相关关系,相关系数分别为-0.935＊＊、-0.886＊.经回归分析,郑麦7698的回归模型：Y（穗数）=759.8-40.2X、Y（产量）=10827-552,7X;众麦998;Y（穗数）=568.6-11.5X、Y（产量）=10235-250.9X.在播量为150kg/hm2的条件下,郑麦7698、众麦998适宜播期为10月10-15日,此期播种有利于形成合理的群体结构,实现较高的经济产量和效益.播期提前应减少播量,郑麦7698最早不能早于10月5日,众麦998不能早于10月10日；播期推迟应适当增加播量,播期每推迟5天,播量增加30kg/hm 2,这样才能有利于实现不同播期条件下的高产稳产.

The Effect of Sowing Time on the Group Development and Yield of Wheat in the Yellow Alluvial Soil in Eastern Henan

To provide the suitable sowing time for Zheng-wheat 7689 and Zhong-wheat 998 which were new breed, the article analyzed the effect of different sowing time on the group and their production about Zheng-wheat 7698 and Zhong-wheat 998. The result shows that the difference of tillering was great before the winter and decreased in the spring in different sowing time,and the difference was maintained to maturation period. The sowing date had the significant negative correlation with the panicle and the yield, and the correlated coefficients were -- 0. 935 ＊＊ and --0. 886 ＊ . The regression model established after the regression analysis were Y （panicles） = 759.8--40.2X, and Y （yield） = 10827--552,7 X. Zhong--wheat：Y （panicles） =568.6--11.5X and Y （yield） =10235--250.9X. When the sowing rate was150kg/hm2, the suitable sowing time of Zheng-wheat 7698 and Zhong-wheat 998 was from 10th to 15th in the October. This period is better for forming the reasonable population structure and achieving the higher economic production and efficiency. If the sowing date was moved up, the sowing rate should be reduced. The sowing date of Zheng-wheat should not be earlier than October 5th, and zhong-wheat should not be earlier than October 10th. If the sowing date was postponed, the sowing rate should be increased. If the sowing date was postponed by five days, the sowing rate should be increased by30kg/hm2, which can be good for achieving the high and stable yield in different sowing dates.