不同熟性棉花品种的器官发育规律研究

对中熟品种中棉12,中早熟品种中棉17、早熟品种中棉16分别在露地上进行春播、晚春播、夏播试验,研究其生长发育规律。结果表明,与中熟品种相比,早熟品种的株高生长、主茎叶节发生、果枝伸展、蕾铃发育的相对速率都较快,因而按播种后相同热量单位比较,叶片所占的比例较小,蕾铃所占比例较大,相同单株干重下亦都有类似趋势。但早熟品种的单株生物量和经济产量均相对较小。结果还表明,早熟品种的生长发育速率较高,如适当增加其播种密度,可一定程度上弥补因生长季热量限制与植株小之不足所造成的损失,从而仍获得较高的皮棉产量和霜前花率。文中还建立了一些关系方程,对不同熟性品种生育习性进行了数量分析。

STUDIES ON THE PATTERN OF COTTON ORGAN DEVELOPMENT OF VARIETIES WITH DIFFERENT MATURITY

Mid--mature variety zhongmian 12, early mid-mature variety zhongmian 17 and early mature variety zhongmian 16 were sowed in spring, late-spring, and early-summer, respec- tively, to conduct research on their growth and development patterns. It showed that early mature variety increased little more quickly than that of mid-mature variety in plant height, numbers of stem node, fruit shoots, Squares and bolls, so its ratios of leaf weight and repro- ductive organs was higher at the same heat units or at same dry weight per plant, but the total dry weight and reproductive organs weight per plant was lower. It also showed that early- mature variety would produce high lint yield and pre-frost yield if its density was increased, its higher development rate and higher density would compensate for its less plant and heat limited in growth season for loss to a certain extent. Through some relative equations, quanti- ty analysis were conducted in growth and development characteristics of varieties with different maturity.