论文部分内容阅读
1.块选法:选择田间管理较好、棉花生长正常、品种纯度相对较高的棉田,严格检查,拔除个别杂株,在棉花吐絮盛期采收中部果枝上1—2个果节上的早、中期正常吐絮棉铃,轧花后棉籽留作种用。 2.株选混收法:选择地力均匀、栽培管理得当、生育正常、生长整齐的棉田,于棉花吐絮盛期选择符合本品种特性的单株,混合收花1—2次。选株时必须根据该品种的标准特性,包括株型、株式、叶形、铃形、纤维性状及成熟早迟等。选株时切勿片面追求某一性状而忽视对综合性状的全面考虑。 3.铃选、瓤选:在采收早、中期花的时候,选留铃大、吐絮畅的大瓤头,或者在早、中期花
1. Block selection method: select the field management is good, cotton growth is normal, relatively high purity cotton varieties, strict inspection, removal of individual hybrids, picking cotton in the mid-flowering litchi fruit 1-2 on the festival Early morning and mid-term normal boll cotton boll cotton leaves after cottonseed for planting. 2. Strain Selection and Selection Method: Choose a uniform soil fertility, proper cultivation and management, normal fertility, tidy growth of cotton fields, the selection of cotton varieties in line with the characteristics of the species, 1-2 times. Strain selection must be based on the standard characteristics of the species, including plant type, plant type, leaf shape, bell-shaped, fibrous traits and early maturity and so on. When selecting a strain, do not pursue one trait unilaterally but ignore the comprehensive consideration of the trait. 3. Bell election, 瓤 election: In the early harvest, the mid-flowering time, choose to stay bell, big bream flocculus head, or in the early, medium-term flowers