摘要
北京地区小麦产量构成因素中的穗粒数一般偏低,且变化幅度较大,又不易控制。从近几年北京小麦高产联合试验的结果来看,亩产千斤的小麦,平均穗粒数只有30粒左右,而一般田只有20几粒。据我们1978年观察每穗上分化的小花数多达166朵,尽管到开花期形态上正常的小花减到40余朵,但最后也只有30余粒。
This paper studied the process of differentiation and degeneration of the florets in winter wheat and their relationship to nitrogen level,The results are summarized as follows:1.The total number of florets differentiated is relatively invariable at about 150 per spike under favourable condition.The time and the quantity of fertilization has no significant influence on the total numberof florets.2.About 50 normal morphological florets per spike are formed at anthesis,only 70%of them reached fructification.Application of nitrogen fertilizer early in the jointing stage(10/Ⅳ,the late doulbe-ridge stage)may improve the quality of a part of florets,while in the booting stage(30/Ⅳ,the meiosis stage)may delay the degenerative process of the florets.At the optimum jointing stage(20/Ⅳ,the beginning of anther-septum stage),however,the application of nitrogen are benefit both to the improvement of the quality of the florets and the increase of the grain number.
作者
王沅
刘捷平
邱泽生
陈阜东
张大宏
黄勤妮
Wang Yuan;Liu Jie-ping;Qiu Ze-sheng;Chen Fu-dong;Zhang Da-hong;Huang Qin-ni
出处
《中国农业科学》
1979年第4期28-34,共7页
Scientia Agricultura Sinica
