优良的棉花种子,是经过精密的选择,良好的培育而成的。培成之后,还要继续的选种和管理,才能保持品种的特性。拔除劣株是管理工作之一。去劣最感到困难的,就是如何来识别劣株的问题。棉花的劣株,依照它的形态,可分为下列四种:一、枝叶丛生的--这种棉株茎上的枝叶,发育得特别繁茂,每节上都生长若生长枝和结果枝,成为一丛枝叶。因为枝叶过多,结的棉铃反而稀少,有时竟全株徒长,不结棉铃。二、成熟极迟的——棉株的下 Excellent cotton seeds are carefully selected and well-cultivated. After training, but also continue the selection and management, in order to maintain the characteristics of varieties. Removal of bad strains is one of the management work. The most difficult to go bad, is how to identify the problem of inferior. The bad strains of cotton, according to its morphology, can be divided into the following four: First, the branches and leaves - the branches and leaves of cotton plant stems developed particularly lush, growing on each section if the growth of branches and fruiting branches, Become a bundle of leaves. Because too many branches and leaves, but the knot of cotton bolls sparse, and sometimes actually whole plant leggy, no knot boll. Second, the maturity of the very next - cotton plant under