Emergency measures for Cotton Bud and Boll shedding

When cotton grows in high temperature and rainy climate, a large number of buds and bolls will fall off, resulting in plant height, size and emptiness, resulting in a large reduction in yield. According to the causes of different shedding, corresponding emergency remedial measures can be taken.

For cotton fields that have been dry for a long time without rain and can not be watered, the leaves of cotton plants are thin and small, the leaves are light green and yellow, the chaff of buds is small, heavy rain falls heavily, light rain falls less, and no rain falls gradually.

Remedial measures: use 200 grams of multi-element boron fertilizer per mu plus 20 ml of Fengchengning, spray evenly with 50 to 60 kilograms of water, spray again at intervals of 7 days, and spray twice in a row.

Due to the excessive water content in the shedding cotton field, some low-lying vesicle roots, soil hardening, loss of permeability, nutrient stagnation, green and thin cotton leaves, yellow and thin leaves, buds and bolls gradually fall off.

Remedial measures: clean up the three ditches, dig the Hengtou ditch deeply, lower the groundwater level, drain the low-lying water, and then plough and loosen the soil. At the same time, each mu of cotton was sprayed with 30 grams of cotton overnight, or 5 grams of green fertilizer, or about 100 milliliters of green wind, 50 kilograms of water and 60 kilograms of water after 4 p.m. and sprayed once more every 7 days for a total of 2 times.

Because the cotton field is too dark and lack of light and ventilation, the lower cotton leaves are gray and then yellow and then fall off. At the same time, the big buds and small bolls also fall off.

Remedial measures: first get rid of some of the old leaves in the lower part of the main stem and cut off the empty branches and leaves without buds. For seriously clouded cotton fields, the plants can be pushed together to increase the light, or the upper half of the line can be cut off every two rows to achieve ventilation and light transmission. Conditional per mu can use 20% triadimefon (triadimefon) emulsion 30ml, add spray Shibao 10ml, water 50kg uniform spray, not only prevent boll disease, but also prevent shedding.

The symptoms of shedding due to boron deficiency are as follows: some buds dry on cotton plants, some "buds do not flower", or the shedding rate increases gradually.

Remedial measures: the cotton field with serious boron deficiency should be sprayed with 50 grams of boron fertilizer per mu every time, once every 7 to 10 days, 4 times in a row. In the fields with mild boron deficiency, boron fertilizer can be sprayed once at the early flowering stage, the full flowering stage and the middle boll setting stage, with 50 grams of multi-element boron fertilizer per mu and 50 kg of water after 4: 00 p. M.

The symptoms of shedding due to potassium deficiency were as follows: thin cotton stalk, askew upper main stem, drooping fruit branches, faded leaves, and gradually falling buds and bolls.

Remedial measures: from budding to flowering and boll blooming, 0.2% to 0.5% potassium dihydrogen phosphate solution can be sprayed per mu, every 7 days, 3 times for 4 times, or 50 kg of plant ash per mu.

Due to crazy growth and loss of water and fertilizer, the branches are loose, the leaves are thick and thick, and the tender tips run sharply. The field is clouded and poorly ventilated, and the buds gradually fall off from the inside to the outside, until there are only one or two buds at the top.

Remedial measures: according to the crazy growth rate, the vigorous growth can be alleviated by spraying 2g / mu of promethamine powder.

Due to the shedding of insect pests, the pests that harm bud and boll shedding are: Toona sinensis, Helicoverpa armigera, corn borer and so on. These pests are not controlled in time, causing larvae to eat bud bolls and lead to shedding.

Remedial measures: do not wait for the larvae to hatch out of the shell, master part of the eggs turn black, two to three days after the use of drug control. If the larvae are not allowed to drill the buds, they will no longer fall off.

Due to lodging and shedding cotton growing to the middle and later stage, there are more buds and bolls, and the load in the middle and upper part of the plant is too high. in case of strong wind and heavy rain, the cotton plant is bound to lodge, causing rotten bolls or bud bolls in the lower middle.

Remedial measures: timely pick up the lodging cotton plant, step on the roots, prevent lodging again, and spray to protect the peach. 50 grams of gold potassium per mu plus 50% carbendazim wettable powder 100 grams, or 30 milliliters of 20% triadimefon emulsion, 100 grams of active paclobutin, 50 kg of water evenly sprayed.