脱叶剂对不同种植模式下海岛棉机采效应及产量与品质的影响OA

In order to investigate the effects of defoliants on machine-picking effect,yield and quality of island cotton under different planting modes,taking Xin 78 as the test material,two-factor split-plot experimental design was adopted,2 planting modes were set including each film planting 3 rows(S3)and each film planting 6 rows(S6),and 3 doses of defoliator spray 150(F1),300(F2),450 g·hm-2(F3)were set with water as control(CK).The effects of defoliant dosage on machine-picking effect,yield and quality of island cotton under different planting patterns were studied.The results showed that,compared with S6 planting mode,S3 planting mode significantly improved the machine-picking quality,boll weight per plant,breaking ratio strength and elongation of island cotton by 4.5％,2.2％,1.4％ and 1.6％.S6 planting mode could significantly increase the number of bolls per plant,and the seed cotton yield of island cotton under S6 planting mode increased by 14.3％.Under the same planting mode,the defoliating effect of F2 and F3 treatments was better,and the difference between extraction quality and yield was not significant,but F3 treatment had a negative effect on fiber quality.In conclusion,under the conditions of this experiment,it was recommended to adopt S6 planting mode in the island cotton field,combined with the spraying of 80％thidiazuron water dispersion granule 300 g·hm-2 and 40％ethrel water dispersion agent 1 500 mL·hm-2,which should meet the mechanical harvesting standard and ensures high cotton yield and quality.