Due to the frequent occurrence of cold air this spring, the temperature is lower than normal and less rainfall causes cotton sowing and emergence. Most of the cotton fields in the Huanghuai area are compared with those of the conventional year: 8 to 10 days after the open-field spring cotton, 9 to 12 days after the emergence, and 6 to 8 days after the sowing of the mulch, and 6 to 9 days after the emergence. In addition, insecticide-resistant cotton, which grows weakly during the seedling stage, is commonly planted, and seedling growth is very slow. It is expected that the budding date of this year's cotton will be delayed by 7 to 10 days from the normal year, which is extremely unfavorable to the harvest of cotton this year. In order to promote the growth and development of cotton seedlings and lay a solid foundation for harvesting, field management should focus on the following points:
Pay close attention to inspections and compensations for seedlings should seize the golden opportunity of the recent rains and pay close attention to inspections and supplements. Lack of seedlings about 10% of the plots, can be used to transplant seedlings; seedlings 2 to 30%, can be primed seeding; when the temperature is higher, cotton seedlings have emerged real leaves, the use of bandits transplanting.
Immediately after the seedlings between the basic seedlings immediately after the seedlings, each hole selected to retain 2 seedlings, 1 to 2 true leaves when the Dingmiao. The time for seedling sowing in saline-alkali field should be postponed properly, and it is appropriate to use 2 to 3 fixed leaves per plant. In order to make up for the loss caused by lack of seedlings, two seedlings can be left at both ends of the broken ridge.
Strengthen the cultivator loose soil immediately after checking the fill seedlings cultivating loose soil, early and medium tillage, more cultivator, root root bar, strong seedlings early hair. According to Changle, Anqiu and other 6 counties and cities for three consecutive years from May 30 to June 10, the average of the survey: 6 to 8 times of cultivating in the seedling stage, 3 times more than the cultivator, more than 0.6 to 1.4 leaves per plant. The rate of diseased plants was reduced by 24.1%. Early budding occurred for 2 to 4 days. The depth of the cultivator between the three true leaves is 3 to 4 cm and gradually deepened to 6 to 9 cm; after 4 true leaves, the depth is increased to 12 to 15 cm. Interplanting cultivars should be shallow, preferably 3 to 4 cm. The cultivator must be able to see the cotton seedlings on all sides, after the rain they must bow and there must be grass.
Comprehensive Prevention and Control of Diseases and Insect Pests According to forecasts, the disease and insect pests in the cotton seedling stage in most cotton regions will be emphasized this year. Comprehensive prevention and control measures shall be applied to ensure timely prevention and control. The main pests at the seedling stage include cotton aphids, horses, and ground tigers. To make full use of the control effects of natural enemies such as ladybugs, the ratio of scoop to tick is within the range of 1:120, and pesticide spraying is not required. In combination with the stable seedlings, the waste seedlings are taken out of the field and buried deep or accumulated, which can eliminate a large number of pests and prevent the transfer of pests from the waste seedlings to the remaining seedlings. Blight, anthracnose, and keratoses can be sprayed with 1:1:200 Bordeaux mixture, or 65% dexamethasone 600-800 times, or 50% carbendazim 800-1000 times, or 50%. Topbuzone 800 times liquid prevention.
Shihmiao Miao Fei for the foot of the foot, seedlings growing rapidly in the plot, before the budding cotton can not be fertilizer; the lack of base fertilizer, poor fertility, seedling growth is weak, Dingmiao immediately after the top dressing. The amount of seedling fertilizer used is 4-6 kg per acre of standard nitrogen fertilizer. It is advisable to chase the seedlings at a distance of 10 cm and apply 9-10 cm deep. If the weather is dry and the soil moisture is poor, a top-dressing method such as “a seedling, a hole, a bowl of water, and a pinch fertilizer†can be implemented.
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