Measures for the Management of Cotton flowering and Boll stage
The main goal of cotton flowering and boll stage management is to protect peach, gain weight and prevent premature senility.
1. Re-application of flower and boll fertilizer: the flower and boll stage is the period when cotton needs the most fertilizer in the whole growth period. For the cotton field with high soil fertility, good rain and soil moisture and prosperous cotton plant growth, topdressing can be applied at the full flowering stage; for the cotton field with general soil fertility, poor soil moisture in drought and weak cotton plant growth, it should be applied early and re-applied, and fertilizer can be applied at the early flowering stage. Generally, 15 kilograms of nitrogen and potassium compound fertilizer per mu. And continue to do a good job in ploughing and loosening the soil, and master the principle that it should be shallow rather than deep.
2. watering in case of drought and drainage in case of waterlogging: if the cotton plant grows slowly, the leaves are dark green, and the top leaves wilt and droop at noon on a sunny day, they should be watered immediately; also pay attention to the timely elimination of stagnant water after heavy rain.
3. Fine pruning: including hitting the top, hitting the group tip and removing superfluous buds. In general, the peak time for cotton fields should be in mid-July. Cotton fields with high water and fertilizer, low density and strong cotton plants can leave 12 fruit branches in late July. Hit the top of the group in the first ten days of August, smearing superfluous buds at any time. For the gloomy cotton field, the old leaves of the main stem can be knocked off by stages from the bottom up to improve the ventilation and light transmission condition of the cotton field.
For the cotton field using non-pruning technology, 3 leaf branches (oil strips) have been left in the lower part of the main stem of the cotton plant, and the leaf branch should be topped timely, and the topping method should be as follows: when the fruit branch of the first leaf branch grows 4 times, the tip of the leaf branch left on the whole cotton plant should be knocked off, and the top of the leaf branch should be fertilized 5 times earlier at the flower and boll stage.
4. Using cotton chemical control technology: chemical control plays an important role in regulating cotton growth, controlling cotton growth and promoting root development. Chemical control can be carried out in cotton fields where there is a trend of overgrowth or overgrowth. In the early flowering stage and full flowering stage, the dosage of Suijiaan is 2ml / mu, spraying cotton plants with water. At the same time, it can be sprayed with mixed insecticide and fertilizer (potassium dihydrogen phosphate).
5. Prevention and control of diseases and insect pests: there are mainly aphids, cotton bollworm and other pests in the flower and boll stage, and diseases such as rotten bolls should be controlled in time.
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Technical Suggestions on Cotton Flowering and Boll Stage Management
Cotton flowering and boll stage is the key period for both vegetative growth and reproductive growth. During this period, the vegetative growth is gradually transformed into reproductive growth. The plant grows vigorously and the daily growth is large. It is the peak period for fertilizer and water demand in the whole life. It is also the key period for forming economic yield. It must be carefully controlled in time to adjust measures to local conditions and seedlings. It is necessary to do a good job in pest control, chemical control, pruning, intertillage and loosening soil. At the same time, it is reasonable and scientific to apply fertilizer and timely appropriate irrigation to make the plant grow steadily and steadily. Plant type and field population structure reasonable, ventilation,
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The effect of spraying fertilizer on cotton is great in the later stage.
In the later stage of cotton growth, the nutrient absorption function of root system decreased obviously, when foliar fertilizer was sprayed to supplement nutrition, it could prevent premature senescence, disease, attack big peach, promote early maturity and strive for high quality, and the effect of increasing yield and income was remarkable. 1. Spraying nitrogen fertilizer to prevent premature senescence: in the later stage of cotton, spraying nitrogen nutrition on cotton leaves can keep cotton leaves green, enhance photosynthesis, prevent denitrification and premature senescence. Mixed spraying of nitrogen fertilizer and "regulator 802" can enhance cotton growth stamina more obviously and increase yield better. From late August to September
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