春小麦幼穗分化进程及其与植株生长发育的关系

为了给春小麦高产栽培提供理论依据，研究了水浇地不同品种在不同年份、地区及农艺栽培措施下的幼穗分化规律及其与植株生长发育的相关性．结果表明。春小麦幼穗分化开始于出苗后的ll～16d，穗分化全过程持续32～41d，不同品种之间以及同一品种在不同水肥条件下均存在较大差异。随着密度的增加，幼穗分化提前，随着施肥量的增加，幼穗分化推迟，分化持续天数延长，氮、磷、钾肥合理配施对促进穗分化的效应明显。春小麦幼穗分化进程与生育时期、叶龄指数具有显著的相关性，叶龄指数可作为判断春小麦幼穗分化进程和实施栽培措施的形态指标．

Process of Spike Differentiation and Its Relation with Plant Growth of Spring Wheat

The experiment was conducted to study the rules of spike differentiation and its correlation with plant growth of spring wheat in different years, regions and agricultural measures under irrigation condition. The results showed that spike began to differentiate from the eleventh day to sixteenth day after emergence, and lasted 32-41 days and there were differences among different varieties. The spike differentiation was advanced with the increase of density; it was postponed and the duration also was extended with fertilization increase. The spike differentiation would be obviously improved by fertilizing N, P, K. The process of spike differentiation was obvious correlation with growing stage, leaf age index. So leaf age index could be used as shape index to tell the process of spike differentiation.