Influence of different promoters compounded with DPC on the spatial and temporal distribution of cotton boll and yield
[Objective]This experiment conducted aims to investigate the effect of chemical topping on cotton boll formation and photosynthetic characteristics by using indirubicin compounded with different acceler-ators in the hope of providing some scientific and theoretical basis for the research application of indirubicin compounded with accelerators on cotton boll regulation and photosynthetic characteristics.[Methods]The ex-periment was conducted in Shaya County,Aksu Region,Xinjiang,China,from April to October 2022.The cotton variety under test was Xinluzhong 84,and the test chemicals were mainly indurated with thiram and auxin,compounded with thiram(0.1%,T1),sodium compounded phenol(98%of the original drug,T2),aminoxate(8%of the preparation,T3),14-hydroxy brassin(0.01%,T4)and naphthalene acetic acid(98%of the original drug,T5),with conventional micronutrient capping as the control(CK),a total of six treat-ments were used to investigate the effects of micronutrient complex promoters on the spatial and temporal distri-bution and photosynthetic characteristics of cotton boll.[Results]The maximum accumulation rate of dry mat-ter was reached at about 20～30 d after the treatment,and the net photosynthetic rate reached its maximum at about 20 d after the treatment,so it could be inferred that cotton entered the critical period of reproductive growth at about 20～30 d after the treatment,and all the compound treatments could improve the sitting rate,net photosynthetic rate and dry matter accumulation rate of the upper middle and lower inner peripheral boll.[Conclusion]The rapid accumulation period of T5 treatment was prolonged by about 5 d compared with CK,and the sitting rate of inner and lower outer boll of cotton plant was significantly different from that of CK.The sitting rate of inner and lower outer boll increased by 15.00%and 20.00%respectively,and that of middle inner and outer boll increased by 24.00%and 25.00%respectively,and the number of cotyledons increased by 1.13,and the number of boll set per plant increased significantly by 0.84.Therefore,it is recommended to use T5 combination type chemical topping agent for cotton chemical topping.
cottonDPCspace-time distribution of cotton bellsyieldphotosynthetic characteristics
万方数据
维普
