Sixty to seventy percent of the average annual rainfall in North China is concentrated in August and September, and frequent rainstorms can easily cause damage to the cotton fields. After the cotton was devastated, the humidity in the field was too large, the ventilation was poor, and the pests and diseases often aggravated. If you do not keep up with scientific management, light growth growth is retarded, and death of cotton plants will result in serious deaths, resulting in a significant decrease in yield and quality. Therefore, flood prevention is the focus of cotton field management during the rainy season. In particular, the insect-resistant cotton planted at the present time has poor anti-mite ability, and the rainy season needs more management.
1. Clean up the cotton field drainage system as soon as possible
Before heavy rain comes, do a good job of dredging the drainage system of the cotton field to ensure smooth drainage. After the heavy rain, the accumulated water will be drained on the same day and no guilt will be formed. According to investigations, the stagnant water in cotton fields for 1-2 days caused the rate of absent buds to be as high as 45.7% to 78%. After 3-4 days of water accumulation, 46%-82% of the plants could not recover and died.
2, timely righting lodging cotton plants
Loosen the fallen cotton plants in time, flush the mud on the stems and leaves with water, and timely root the roots to ensure the normal photosynthesis. The cotton plants should be timely and carefully handled to avoid artificially damaging the roots and leaves, so as to avoid causing the plants to suffer losses and reduce production.
3, timely cultivation of soil
Due to heavy soil compaction in cotton fields, poor ventilation, and low ground temperature, serious impact on root activity, timely cultivation of cultivating soil and promoting root activity to recover as soon as possible. The cultivator should be carried out when the soil is left to dry. Premature cultivator will increase soil consolidation. Due to the decreased ability of the cotton roots to reproduce after being planted, in order to avoid root damage, the cultivator should be shallow and should not be deep, and 3 to 4 cm is appropriate. In combination with cultivating the soil twice, the soil will not only facilitate the growth of the roots, but also prevent the occurrence of lodging again when encountering wind and rain in the future.
4, timely application of quick-effect fertilizer
In order to promote the recovery of the cotton plant as soon as possible, the foliar fertilizer is applied one to two times and the interval between the two is 5-7 days after the cotton plant is righting and till the cultivator. Can be sprayed with 1%-2% urea dilution, or 0.3% potassium dihydrogen phosphate solution to promote the recovery of the plant as soon as possible. When the soil is not sticky and heavy, the ditch is topdressed with urea once at a distance of 10 cm from the cotton plant, and the dosage is 6-10 kg per mu.
5, do a good job of pest control
After the cotton grows and grows again, new branches and leaves become more and more tender, resulting in serious damage to pests such as cotton aphid, cotton bollworm, blind stink bug, bridge-building insect, and weevils. In particular, they must be alert to the explosion hazards of Fuxi. At the same time, due to the high soil moisture, the cotton fields are susceptible to rotten bells. Therefore, we must strengthen pest and disease investigations and do a good job of comprehensive prevention and control. If there are many natural enemies of pests that can control the damage, no pesticide control is needed to minimize the number of chemical defenses. The discovery of rotten bells should be picked up promptly, which can reduce losses and effectively control the spread of diseases.
6, scientific pruning, timely watering
By the cotton plant generally than the normal cotton plant growth period delayed about a week, Fushi peach rarely, Piao greatly reduced. After the growth is resumed, a large number of shoots are easily sprouted, which consumes water and fertilizer and must keep up with the pruning. In order to make up for the lack of early-stage ringing, it may be possible to compensate for the early losses by applying early night-time 3-5 days, timely watering in case of drought, spraying the top dressing on leaves, etc. According to experiments, cotton that has been poured into dry and dry water and drought in early autumn has 2.26 more bells than the average single plant without watering, and the weight of single boll increases by 0.25 g and increases by 31.3%.
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