Response characteristics of source and sink organs of drip irrigation cotton to chemical topping
[Objective]To explore the effect of chemical topping on photosynthetic characteristics and the change rule of cotton boll material accumulation in different parts,provide a basis for high quality and high yield of cotton.[Methods]Taking Xinluzhong 70 and Xinluzhong 82 as materials,two chemical topping a-gents were set up in the experiment,and manual topping was used as control.[Results]The results showed that after 10 days of spraying,the net photosynthetic rate of the main stem functional leaves of the chemical topping treatment was higher than that of the artificial topping treatment,and the SPAD value of the middle and upper parts of the chemical topping treatment was higher than that of the artificial topping treatment,while the lower part of Xinluzhong 82 showed that the chemical topping was lower than the artificial topping.The ac-cumulation of Xinluzhong 70 was greater than that of Xinluzhong 82,but the accumulation rate was less than that of Xinluzhong 82.The dry matter accumulation of the whole boll of the chemical topping treatment showed that the first two flowering periods promoted the dry matter accumulation of the late cotton boll,and the two va-rieties were developed after 35 and 28 d,respectively,while the flowering period on July 21 promoted the dry matter accumulation of the early cotton boll,which was developed within 28 and 21 d,respectively.The growth eigenvalue time of the first two flowering periods of the chemical topping treatment was delayed or increased compared with the manual topping treatment,while the flowering period on July 21 showed that the chemical topping treatment moved forward and increased compared with the manual topping treatment,and the maximum growth rate showed that the chemical topping treatment was greater than the manual topping treatment.[Con-clusion]Chemical topping can improve the photosynthesis of the functional leaves of the main stem of cotton,accelerate the accumulation rate of cotton boll matter,facilitate the concentrated opening of cotton bolls.
cottonchemical toppingphotosynthetic characteristicscotton boll developmentaccumula-tion of matter
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维普
