Defoliation & Ripping Agent: Effect on Cotton Yield and Application Analysis

doi:10.11923/j.issn.2095-4050.cjas2022-0005

Abstract

Abstract:

In order to study the effect of defoliation & ripping agent (Xinsaili) on cotton yield and its application, two cotton planting densities and two dosages were set up, and the yield, defoliating rate, boll opening rate and fiber quality were compared and analyzed. The results showed that the total yield of lint and seed cotton before frost was the highest when the density was 112500 plants/hm² and the dosage was 2700 mL/hm². The lint percentage was the highest when the density was 82500 plants/hm² and the dosage was 1800 mL/hm². Xinsaili had no obvious effect on the seed index, plant height, the height of the first fruit branch and the number of fruit branches in each treatment. For defoliation rate, the effect was better at the density of 82500 plants/hm², the defoliation rate could reach 100% at the upper and middle positions of the plant, while the defoliation rate was over 92% at the density of 112500 plants/hm². In terms of ripening, boll opening rate at the density of 82500 plants/hm² was higher than that of 112500 plants/hm². Xinsaili had a certain influence on the fiber quality, which was mainly shown as slight decrease of upper half length and breaking tenacity. Taken together, the application effect of Xinsaili is good, and it can be applied with suitable dosage in time before mechanical harvesting or when cotton flourishes in autumn but does not mature properly.

Key words: cotton, defoliant &, ripping agent, defoliation rate, boll opening rate, yield, fiber quality

JIN Lulu, XU Min, WANG Zisheng. Defoliation & Ripping Agent: Effect on Cotton Yield and Application Analysis[J]. Journal of Agriculture, 2023, 13(3): 35-39.

Figures/Tables 8

References 17

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处理	82500/（株/hm²）				112500/（株/hm²）
用量/(mL/hm²)	0	1800	2700		0	1800	2700
编号	CK1	A	B		CK2	C	D

处理	82500/（株/hm²）				112500/（株/hm²）
用量/(mL/hm²)	0	1800	2700		0	1800	2700
编号	CK1	A	B		CK2	C	D

处理	霜前皮棉/ (kg/hm²)	籽棉总产/ (kg/hm²)	霜前花率/ %	衣分/ %	子指/ g
CK1	918.18e	2527.27e	81.29c	41.69	10.9
A	1231.82c	2968.18c	92.19b	42.02	11.1
B	1150.00d	2836.36d	93.11ab	40.55	10.7
CK2	1131.82d	3147.73b	78.12d	41.03	11.3
C	1631.82b	3820.45a	92.80ab	40.85	11.0
D	1684.09a	3888.64a	94.45a	40.03	11.1

处理	霜前皮棉/ (kg/hm²)	籽棉总产/ (kg/hm²)	霜前花率/ %	衣分/ %	子指/ g
CK1	918.18e	2527.27e	81.29c	41.69	10.9
A	1231.82c	2968.18c	92.19b	42.02	11.1
B	1150.00d	2836.36d	93.11ab	40.55	10.7
CK2	1131.82d	3147.73b	78.12d	41.03	11.3
C	1631.82b	3820.45a	92.80ab	40.85	11.0
D	1684.09a	3888.64a	94.45a	40.03	11.1

处理	株高/cm	第一果枝高度/cm	果枝数/个	开絮铃数/个
CK1	73.5	25.2	8.6	6.2d
A	74.4	27.3	8.5	9.4ab
B	71.0	26.5	8.3	9.6a
CK2	70.2	31.2	7.8	5.8e
C	68.2	30.6	7.5	9.0c
D	69.6	29.8	7.9	9.2bc