Editor's note: At present, cotton in Hebei Province has gradually entered the seedling stage. In order to properly implement the management of cotton seedlings, the Provincial Department of Agriculture organized the provincial cotton expert advisory group to report on the emergence of cotton in Fujian, Xingtai, Hengshui and Quzhou. Inspected. In view of the adverse effects of the recent rainy and low temperature special weather conditions on the emergence of cotton, after field analysis and consultation, the study put forward the “Technical Opinions on Cotton Seedling Management in Hebei Province in 2008â€, which is now published for publication and dissemination as soon as possible.
At present, Hebei Province has entered the seedling stage from south to north. According to field inspections, the province’s cotton planting base is better this year, and the emergence is better than in previous years. The total seedling area accounts for more than 85% of the cotton field area. However, due to the cotton planting in our province, there were many rainfall and low temperature weather in the cotton area of ​​our province. Photographic deficiencies were insufficient, resulting in poor emergence of some cotton seedlings. The growth and development of cotton seedlings was slow, the seedlings were small, the seedlings were weak and irregular; Blight, anthrax Diseases such as diseases commonly occur at the seedling stage and are heavier than in previous years; some cotton fields have already developed locusts.
In view of the special climate conditions and the current growth of cotton seedlings this spring, it is recommended that the following technical management measures be taken under the premise of local conditions, classification guidance, scientific management, and cultivation of strong seedlings:
First, check the seedlings to make up for the seedlings, to ensure that the whole seedlings are severely deficient in seedlings, do not make up seed points, and it is best to transplant seedlings by transplanting seedlings to ensure the seedlings. If there are no more than three continuous seedlings, two plants may be reserved, or leaf shoots (cramps) may be used to make up for the lack of seedlings.
Second, cultivating loose soil, increase the ground temperature, especially after the rain, timely cultivating loose soil, remove the compaction, raise temperature and suppress the occurrence of seedling disease, the depth of the cultivator does not exceed 5 cm.
Third, timely sparse seedlings, nurturing seedlings For large seeding, emergence, cotton seedlings thick cotton fields, when the general growth of a true leaf, timely sparse seedlings, weak seedlings, so that cotton leaves do not take the leaves, To prevent the emergence of tall seedlings; in view of the low temperature in May, seedling disease is heavier, it is recommended to properly postpone the Dingmiao, when there are three true leaves when the Dingmiao.
Fourth, take multiple measures, early prevention and control of pests and diseases should be a combination of agronomy and chemical treatment, and timely control of pests and diseases. In view of the current crop blight and anthracnose, we must increase the ground temperature by taking measures such as cultivating stalks to promote the recovery of diseased seedlings. In the next stage, we must pay close attention to the occurrence and damage of locusts, thrips, and blind animals. In particular, locusts, when the rolling leaf rate of 5% can be used for chemical control, with 10% adriamycin spray control, 15 to 20 grams per acre medication can be continuous medication twice, spaced 7 days.
Fifth, timely removal of the film, to promote the root of the lower rainfall for more humidity in the land, change the film in mid-June in late film removal method, should be set in May after the definitive film removal, planning, and promote root bar, Cultivate strong seedlings.
Six, scientific control. Regulating growth For weak cotton plots, it is recommended not to carry out chemical control during the seedling stage; For large rainfall, rapid land after rain, in order to prevent tall seedlings, long seedlings, promote root growth, promote Foliage spraying shrinkage security, no more than 0.5 grams per acre, the principle of spraying is not spray large spray.
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