Cotton Growth Regulation and Boll Retention: Application of Regulators to Prevent Boll Shedding

Choline chloride

The application of 40-50 mg/L choline chloride in the early flowering and boll-setting stages of cotton has a significant increase in yield. The boll weight, number of bolls per plant and lint yield per plant are increased by 8.9% to 9.4% and 12.1% to 12.7%, respectively, compared with the control. %

and 24%.

Chlorhexidine

From the initial flowering stage to the full flowering stage, spray 3 times with 50-60 mg/L liquid medicine, with an interval of 10 days each time, which can prevent the plants from becoming leggy, promote chemical pruning, and make the plants compact, which has the effect of dwarfing, topping and increasing yield.According to the test, the plant height of cotton treated with chlorophyll was 20-30 cm lower than that of the control, and the upper fruit branches were 1-7 cm shorter than that of the control.

Methylpiperium

The use of methylphenidate on cotton should be determined according to the growth status of cotton, and the dosage should be adjusted in combination with water and fertilizer management and cotton growth.

①1 to 2 true leaves, two leaves are flat, the dosage of methylphenidate should not be too large, the general dosage is 0.15 ~ 0.3g of active ingredients per mu, and the weak seedlings can be adjusted.

②In the 4-8 leaf stage, the general dosage is 0.5-1 g of active ingredients per mu, the lower limit for strong seedlings and the upper limit for vigorous seedlings.

③ In order to shape the ideal plant type of cotton from the budding period to the head water, in addition to appropriately delaying the head water in the vigorous and strong seedling cotton fields, the application of methylphenidate can also be carried out according to the situation of the seedlings. The general dosage in northern my country is the use of active ingredients per mu. 1 ~ 1.5g, southern Xinjiang is 1.2 ~ 1.5g.

④From the head water to the flowering stage, the cotton plant enters the bud stage, and the vegetative growth rate is obviously accelerated. Chemical control is mainly based on water and fertilizer regulation. It is only necessary to carry out chemical adjustment on cotton fields that are growing too vigorously, usually 2 to 3 days after drip irrigation. The dosage of cotton fields in northern Xinjiang is generally 1.5 to 2 g per mu of active ingredients, and 1.5 to 2.5 g in southern Xinjiang.

⑤In the flowering period, cotton enters the period of vegetative growth and reproductive growth, and chemical adjustment is carried out for the cotton fields that are growing too vigorously. Cotton fields in northern Xinjiang use 2 to 2.5 g of active ingredients per mu, and 2 to 3 g in southern Xinjiang.

⑥7～10d after topping, the dosage of methylpiperpin in northern Xinjiang is generally 6～10g per mu of active ingredient; in southern Xinjiang, the adjustment is carried out in 2 times: when the first fruit branch stretches to 8～10cm, the active ingredient per mu is used. 6～8g.For the second time, when the second fruit node of the top fruit branch extends to 5-8cm, use 8-10g of active ingredients per acre, and the interval between the two sprays is about 7d.

Paclobutrazol

Spraying the whole plant with 150mg/L paclobutrazol liquid at the bud stage can dwarf the plant, promote the boll to sit on the peach, and increase the yield.Paclobutrazol can also be applied by drip irrigation cotton under the film with water.The effect of increasing yield is remarkable, which is 10%-20% higher than that of the control. The population structure is reasonable and the plant height is suitable. The average is 5-7.5cm lower than the control, and the reduction is 10%-15%. The leaf area is reduced, the leaf inclination angle is increased, the transmittance of scattered light is enhanced, and the ventilation is good.

Adjust the security

Adjusting the time and dosage of the application on cotton should be determined according to the condition of the seedlings and soil strength and the weather conditions at that time.

①Cotton fields with moderate fertility, lack of stamina, or slow growth in case of drought, should be treated with 66.6mg/L foliar spraying liquid in full bloom.

②The cotton field has moderate fertility, sufficient stamina and stable appearance. It is treated by foliar spraying of 66.6-100 mg/L liquid medicine in the early flowering stage (10%-20% flowering).

③The cotton field has sufficient fertilizer and water, good stamina or more precipitation in the middle of cotton growth, and the appearance of prosperous growth. The first adjustment is to use 116.6-166.6 mg/L of foliar spray in the bud stage, and the second adjustment is at the beginning. From flowering to full bloom, foliar spray with 50-83.3mg/L liquid medicine.

④The cotton field has sufficient fertilizer and water, good stamina, high precipitation, high planting density in the field, and crazy-growing appearance. The first regulation is to spray with 150-183.3 mg/L of liquid medicine in the bud stage, and the second time is to use 50-183.3 mg/L in the early flowering stage. 100mg/L liquid medicine was sprayed, and the third time in full bloom period, depending on the growth of the field, supplementary spraying with 33.3-66.6mg/L liquid medicine.

27.5% amine fresh and mepinium

Spraying with 140mg/L liquid medicine in the early flowering period can inhibit the vigorous growth of cotton plants, shape the ideal plant type, delay the closure of rows, increase the number of high-quality bolls, and simplify the mid-term pruning. Promote early bell formation and multiple bell formation, and prevent bells from falling off. Spraying with 140mg/L liquid medicine in the full bloom period can inhibit the growth of ineffective branch buds and superfluous buds in the later stage, prevent greed and late maturity, increase early autumn peach, increase boll weight, and promote early maturity.