Cultivation techniques of cotton K7

Shaping the ideal plant type is the guarantee to realize high-yield and high-quality cotton cultivation. According to the co-extension relationship between cotton leaf age and various organs, the whole process regulation of cotton vegetative growth and the formation of buds and bolls is the key to high-yield cultivation.

First, to improve the soil fertility

Increase the intensity of intensive cultivation, increase the application of potash fertilizer, and improve the utilization rate of fertilizer. 60% nitrogen fertilizer, more than 90% phosphate fertilizer, 100% potassium fertilizer and cottonseed cake were used in the ploughing and ploughing layer before sowing, and the rest was used as topdressing.

Second, treating alkali and protecting seedlings

Early in autumn, winter irrigation pressure alkali, 667 square meters of irrigation water 80,100 cubic meters. Irrigate according to soil moisture in spring. Soil preparation should be carried out according to irrigation order or soil texture, with "soil moisture" as the center, reaching the seven standards of edge, level, broken soil, clean grass, sufficient soil moisture, light saline and alkali, upper deficiency and lower reality.

III. Early sowing at the right time

1. Suitable time for sowing

The sowing began when the ground temperature of 5 cm passed steadily through 12 ℃. More than 90% of the seeds are 2-3 per hole, the hole rate is less than 2%, the sowing depth is 2-3 cm, and the soil covered with film is 0.5-1 cm. It is required that the broadcasting end is straight, the receiving amplitude is accurate and the depth is the same.

two。 Check seedlings and replant

Quality inspection and replanting should be carried out in time after sowing. It is required that the seedlings should be finished with one leaf and one heart, and one seedling at one hole should be put an end to double plants, and deep ploughing should be done twice before and after this.

IV. Management of bud period

Main goal: to coordinate the growth and development of cotton plants, to achieve steady growth, strong but not prosperous, early buds, reduce shedding, achieve June flowers, and build a high-yield shelf.

1. Chemical adjustment

For 667 square meters in 3-leaf stage, 0.2-0.3 g in 3-leaf stage and 0.5-0.8 g in 6-leaf stage, 0.5-0.8 g in 667 square meter. At this time, look at the sky, seedlings and ground, and grasp the dosage at the right time. If the cotton seedling reaches less than 18 cm 20 cm or the red stem ratio reaches 60%, the dosage can be appropriately increased when the plant height exceeds 25 cm. General head water before 667 square meters with 0.8-1.5 grams of thalidomide, at the same time with foliar topdressing.

two。 Fertilizer and water

According to the local management experience to determine the head water time of different irrigation methods, adjust fertilizer with water, promote early seedling development, early budding, flowering, and now big buds.

V. Management of flowering and boll period

Main target: increase flowers and protect bolls, take peaches full waist, cover autumn peaches, prevent hollow, less shedding, more bolls, increase boll weight, achieve boll catkins in July and August, promote prematurity and prevent premature senility.

1. Chemical adjustment

The second water pre-adjustment of 667 square meters with 2.5 grams of acetylamine, while foliar spraying 250 grams of potassium dihydrogen phosphate + 200 grams of urea. The amount of water in one week after topping is 5-8 grams, and it is better to enter water 3-5 days after adjustment.

two。 Pruning

Normal cotton fields top around July 10, while Wangchang cotton fields can be advanced to July 5 and end before July 20. To achieve "branch to unequal time, time to unequal branch". Pruning was carried out in the first and middle of August to remove the invalid flower buds and empty fruit branches in the middle and upper part of the cotton plant, so as to reduce nutritional consumption, increase the ventilation and light transmission ability of the population and the weight of single boll, and prevent greedy green and late ripening.

VI. Disease and Cordyceps Control

1. The control of weeds should pay attention to the chemical control before sowing and in the middle and later stage.

two。 Aphid control is mainly focused on the investigation and control of cotton plants in the center of the cotton field, and the aphids are controlled or eliminated by means of stem coating, heart dripping, yellow board and so on. For the spread of cotton aphid, the combination of urine washing mixture and biological preparation can be used to control cotton aphid.

3. Red spider found to treat one plant, do not use medicine in a large area.

4. Three treatments should be carried out for the cotton bollworm, that is, the first generation, the second generation and the third generation. Adhere to the "first-and second-generation biological control, third-generation chemical control". It can be controlled by placing sex attractant, trapping moth by high pressure mercury lamp, digging pupae artificially, catching insects by breaking ridges and irrigation in autumn and winter.