I. Technical points for cotton sowing:
1, to achieve a fine level of earth, Panasonic, warming and protecting.
2, apply enough base fertilizer. Pay attention to three points: Reapplying organic fertilizer, applying 2-3 tons of farmyard fertilizer per acre; to use chemical fertilizers in a balanced manner, nitrogen fertilizer should account for 10%-30% of the growth period, phosphate fertilizer 40-50 kg per acre, and potassium fertilizer 10-mu per acre. 15 kg, copper deficiency or lack of zinc to increase the application of 1-2 kg of copper fertilizer or zinc fertilizer.
3, irrigation water, ensure the water holding capacity of cotton fields to 78% -80%.
4. Good quality seeds and high-quality seeds in the constituencies.
5, appropriate sowing (5 cm above the surface temperature can be more than 14 degrees sowing). According to the actual situation, the selection of seedlings for transplanting or mulching film, seeding depth of 1.2-2cm.
Second, cotton seedling management:
In the general seedling stage, water consumption is less than 15%, and nitrogen uptake is 5% or less. The seedling management of high-yielding cotton fields is mainly to strengthen the middle cultivator, and the cultivator should go from shallow to deep. For a small number of weak seedlings, the first application of 20% urea drenching measures to promote the weak seedlings rush.
Prevention and treatment of seedling disease: seedling disease is mainly blight and anthrax. Pre-planting treatment and post-emergence strengthening of cultivator can prevent disease. The main pests at the seedling stage are aphids, which can be sprayed with a 1000-fold solution of dimethoate, monocrotophos, or ammonia-phosphorus, in addition to the fernandanine soil.
III. Comprehensive prevention and control of cotton seedling pests and diseases
1, to carry out cultivator loose soil, destroy the hardened layer, can increase the temperature, reduce pests and diseases.
2. The use of intercropping of cotton and mung bean crops to breed natural enemies can reduce the hazards of seedling mites, and waste seedlings during thinning should be handled outside the field.
3, seedling pest control indicators:
Aphid three true leaves before the leaf strain 10%
Four true leaf curls 20%
Scoop ratio 1:120
10% of the damaged plant before corn borer
50% of damaged plants
Tigers killed 30%
Suitable agents are: 40% omethoate 100 times; 40% monocrotophos 200 times; 20% methomyl 250 times;
5-7 times of cotton insects, omethoate control cotton aphids; 100 ml of 50% 1605 plus 1 kg of water sprayed 10 kg of fine sand, Mushi 5 kg prevention and control of tigers.
IV. Management of Cotton Flowering and Bolling Period
1. The goal of flowering and bolling period management is: do not spitting, not prematurely aging, more bells, less fall off, less rotten bells.
2. The increase in plant height from the early flowering stage to the flowering stage is 2cm-2.2cm. When the first flower is open, the plant height is about 55cm, about 75cm after the topping, and the final plant height is 90cm and no more than 1 meter.
3, management measures: top dressing, irrigation, drainage, pruning, pest management. The flowering and boll season is the peak period of fertilizer demand, and the nitrogen fertilizer should be re-applied. The urea can be topdressed at flowering stage and it is 7.5-10 kilograms per mu. The water consumption of the irrigation and flowering bolls is large, and the relative water content of 1-20cm is kept at 70. About %; timely drainage during the rainy season; topping period from July 15th to July 20th;
4, from the beginning of boll opening to the frost to go through 50-60 days, then to maintain the function of the leaves, keep the water, to prevent the late spraying of erythrocyte green eczema, premature aging in the blade fertilizer 2% urea water or 500 times potassium dihydrogen phosphate .
V. The management of cotton in the middle and later stages includes three stages: the bud period, the flowering period and the boll opening period. 1. During the budding period, it is necessary to hold steady and make the cotton grow steadily. Measures: Weeding, weeding, leaf removal, irrigation and irrigation, and prevention of pests and diseases. 2, flower and bell period to grasp more, more flowers and more bells bell knot knot, to make cotton not crazy. 3, Botany period to prevent late-maturing lust and premature aging. Measures: Top-dressing, fertilizer application, drainage in areas with high rainfall, and chemical-controlled pruning.
Sixth, cotton mulching film covering cultivation techniques
1, fine soil preparation. 2. Apply enough base fertilizer before planting. 3, select the species to stop the two kinds of suitable (proper, timely) broadcast. 4, strict coverage. 5, timely cutting membrane seedlings. 6, scientific fertilization. 7, guard against defeat. 8, disease prevention and pest control.
Seven, insect-resistant cotton cultivation techniques
1. Apply base fertilizer: 2000-4000 kilograms/mu of mixed fertilizer.
2, timely sowing, nursery period in late March - early April, early May transplanting.
3, remove mixed seedlings, 2500 per mu.
4, removal of early buds.
5, science pest control.
6, re-introduction of bud fertilizer. Organic manure combined with chemical fertilizer, cake fat 25 kg, urea 10 kg/mu.
7. Remove ineffective buds.
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