Abstract: The purpose of the experiment is to screen suitable planting spacing distribution patterns of different cotton varieties under reasonable density planting conditions,and to provide certain technical support for the development of mechanized cotton harvesting in the Yellow River basin. Three main cultivars in central and Southern Hebei were selected:Jimian 958,Shikang 126 and Ji 863. The test set four different strains of row spacing:80(Ⅰ),75(Ⅱ),70,(Ⅲ),(100+50) cm (Ⅳ) under 75 000 plants/ha planting density,at the same time set the conventional planting density of 45 000 plants/ha to control (CK,spaced 80 cm),to study the influence of different strains of planting spacing the under reasonable density planting condition on cotton growth,yield and quality. The results showed that the effects of different planting spacing on plant height,stem width and number of fruiting branches of different varieties were different under reasonable dense planting. There was no significant difference between the bolls No. per plant in Jimian 958 and Shikang 126,but the numbers were significantly lower than CK which was in low density. The ratios of the boll-setting per plant in treatments Ⅱ and Ⅳ were significantly higher than treatments Ⅰ and Ⅲ. The bolls No. per plant in treatment Ⅳ was the highest in Ji 863,and then was treatment Ⅱ. The seed cotton yield in processing Ⅳ was the highest in Jimian 958. Which in treatments Ⅱ and Ⅳ were significantly higher than treatments Ⅰ and Ⅲ in Shikang 126. And the yields in treatments Ⅱ and Ⅳ were higher than treatment Ⅲ in Ji 863,and which in treatment Ⅲ was higher than treatment Ⅰ,but there was no significant difference. It was recommended that the suitable planting spacingn of three cotton varieties should be 75 cm and (100+50) cm row spacing.

Key words: Reasonable density planting, Plant spacing, Agronomic traits, Boll-setting, Yield, Fiber quality

CLC Number: 

• S318

• S562.01