During the period from March to April this year, there are more rainy weather, which is detrimental to the cultivation and management of field crops, and cotton is no exception. In the process of cotton seedlings, cold damage and waterlogging often occur. If management is neglected, there will be fertilizer damage.
Symptoms of frost damage: First, the development of cotton seedlings is retarded, the young stems turn red, the leaves of the true leaves are small, and the cotyledons are apt to fall off prematurely; second, the young leaves are shriveled and resembled as a locust infestation; and thirdly, the stems and leaves become wilting and die. Analyze the reasons for this: First, the sowing stage blindly advances; after the emergence of the crop, it encounters a cold wave, and the temperature has turned sharply; second, the plastic insulation film was prematurely opened, or the film was taken back home prematurely; and the film was not covered immediately after the film was removed during the day.
Symptoms of waterlogging: First, the young roots of cotton seedlings change from white to brown and black, cotton seedlings are long; second, poor development of young stems, poor toughness; third, it is easy to fall into pieces when it is clear and sharp; Diseases and other diseases. Analysis of reasons, one cotton drainage system for many years in disrepair, can not be discharged after the rain; Second, the bed is not open around the seedbed lift; Third, the seedbed soil is more viscous, poor drainage.
Symptoms of fertilizer damage: First, all kinds of cotton seed sowing after rotting, no emergence; Second, radicle, germ burns, germination rate is very low; Third, the root burns, young leaf margin scorch; four cotyledons, leaves off, Only the growing point is green. Analysis of the reasons, first, basal fertilizer only applied urea, urea contained biuret easy to dehydration of cotton seed cells, inhibit seed germination; Second, the base fertilizer is too large, the concentration of soil solution is too high, resulting in reverse osmosis damage seedlings The third is the application of unripe organic fertilizer, easy to produce high-temperature burning seedlings in the fermentation process; Fourth, when top dressing, the application of liquid fertilizer concentration is large, cotyledons, young leaves quickly dehydration.
To address the “three harms†problem that tends to appear in the above cotton nursery, the following measures should be taken:
First, we must prevent blind sowing. The first is to understand the temperature requirements of cotton emergence. The minimum temperature of cotton sprouts is 10.5°C, the emergence temperature is above 12°C, and the accumulated temperature of the emergence is 80°C-100°C. It can meet the temperature requirements before it can emerge normally. Second, to understand the local climatic conditions, take the middle reaches of the Yangtze River as an example. The average temperature in late March is above 9°C. The average temperature in early April is above 13°C, and the average temperature in mid-April is above 16°C. Therefore, it is advisable to focus on the pilot broadcast in early April and focus on large-scale broadcasting in mid-term; the third is cotton. After the emergence of the seedlings, attention should be paid to the early release of the cover film so that the seedlings can not be transplanted and the film cannot leave the seedbed.
Second, we must finely organize cotton seedbeds. Firstly, the site of the seedbed cannot be re-planted to prevent the infection of residual pathogens. Second, the cotton field water system must be able to discharge energy and irrigation, and the bed of the seedbed should be raised in bed; the third is to increase the quality of organic fertilizer, improve the soil structure, and the spring rain can reduce the energy filter. Stay in bed to rain.
Third, we must increase the level of fertilization. First, the organic fertilizer in the seedbed basal fertilizer must be fully decomposed, which can prevent high-temperature burning seedlings, and can also prevent seedbed weeds and cotton seedlings from competing for fertilizer, contending for water, and contending for light. Each 10 square meters of seedbed can be applied to maturity of commercial organic fertilizer 5-8 kilograms; second is to avoid using urea as seedbed base fertilizer, anti-cotton seed dehydration asphyxia. Select nitrogen, phosphorus, potassium compound fertilizer, every 10 square meters of seedbed, the amount of 0.75 kg is appropriate; Third, the top dressing with rotten dilute human urine as well, with caution flushing fertilizer material; four is regardless of base fertilizer, top dressing, Application can not be excessive.
Green & White Onion,Dehydrated onion ring,Dehydrated scallion,Condiment dehydrated green onion,Dehydrated edible leek
Jiangsu Tiankang Food Co., Ltd. , https://www.tiankangfood.com