种植密度对棉花农艺性状、产量及纤维品质的影响OA

To determine the optimal planting density of cotton in southwestern Shandong,a field experiment was conducted at the Agricultural Science and Technology Park of Jiaxiang County,Shandong Province in 2023,using cotton variety Lumianyan No.28 as the test material.5 planting density treatments were set,including 28 000,40 000,46 000,56 000 and 60 000 plants/hm2,with a randomized block design.The effects of planting density on the growth process,agronomic traits,yield and fiber quality of cotton were investigated.The results showed that the seedling emergence stage of cotton exhibited no significant difference among all treatments.With the increase of planting density,the stages of squaring,flowering and boll opening were delayed,and the whole growth period was prolonged gradually.Plant height,number of fruit branches,fruit nodes and bolls per plant decreased continuously,while the node position of the first fruit branch increased.Boll number per unit area and seed cotton yield increased first and then decreased with the rise of planting density,reaching the maximum values of 54 786 bolls/667 m² and 5 745.12 kg/hm² at the density of 56 000 plants/hm².Boll weight declined steadily as planting density increased.All fiber quality indicators were generally negatively correlated with planting density,among which reflectance and spinning quality index were significantly affected by density.Considering all indicators comprehensively,56 000 plants/hm2 was the optimal planting density for Lumianyan No.28 under the experimental conditions.This study can provide a reference for high quality and high yield cotton cultivation in local areas.