Five measures for regrasping cotton at seedling stage

Cotton takes about one month from emergence to budding, which is a single vegetative growth stage, and it is an important growth period to promote root rooting, prevent seedling disease, promote early development, and then reach early budding. The field management of plastic film cotton mainly includes releasing seedlings in time, ploughing and loosening the soil, checking seedlings and replenishing seedlings, preventing diseases and pests, fixing seedlings, and so on. Cotton farmers everywhere have a lot of experience in the seedling management of cotton, which is worth popularizing, which is summarized as follows:

Release seedlings early and block holes late. When 50% of the cotton seedlings are unearthed, the cotyledons can be released in batches when the cotyledons are flat and turn green. The principle of seedling release is: release it sooner or later on a sunny day and surprise release on a cloudy day. Some cotton farmers dare not put it early, enlarge it too late, and the cotton seedlings stay under the film for too long, so it is easy to form tall seedlings and diseased seedlings, or even die from sunburn at noon, which is not advisable. Late plugging of seedling holes is mainly aimed at preventing seedling disease. Although Qixingduo cotton has the ability of disease resistance, it is also susceptible to disease under long-term low temperature, rainy and cold environment. Therefore, when the soil moisture is high, late blocking of seedling holes for ventilation and drying is an effective measure to prevent cotton seedling disease.

Transplanting and replenishing seedlings: the whole seedling is the basis of a bumper harvest. We should seize the good opportunity of rain after the seedlings, and pay close attention to checking and replenishing the seedlings. If the plastic film cotton lacks 20% of the seedlings, we can transplant the large seedlings with soil. Choose the cotton seedlings with the same size and 2 true leaves and use the transplanting device to transplant, and the 13 cm transplanter should be used to ensure the depth of the soil platform. In this way, the survival rate of transplanted cotton seedlings can reach 100%.

Interspersed seedlings, fixed seedlings. After the basic whole seedling, two healthy seedlings can be left in the hole sowing, and the leaves of the interseeding seedlings should not touch the leaves. If the seedling disease is serious, the seedling setting time should be postponed appropriately, and it is appropriate to set the seedling when 3 or 4 true leaves appear, and one true leaf and 3 true leaves should be used for Qixing multi-cotton resistant seedlings.

Middle ploughing and soil cultivation: after the emergence of cotton seedlings, it is necessary to keep up with the middle ploughing in time to achieve early ploughing, diligent ploughing, deep ploughing, shallow first and then deep, and it should be deepened when it is rainy and cold. The depth of intertillage in front of 3 true leaves gradually deepens from 3 cm to 6 cm 9 cm, and after 4 leaves until budding, it deepens to 12 cm 15 cm.

Topdressing at seedling stage. We generally do not advocate topdressing at the seedling stage because the base fertilizer has been fully applied, and if the base fertilizer is not applied, the topdressing needs to be applied at a depth of 10 cm between plants and buried deeply after application. Before sowing, the soil preparation must apply sufficient base fertilizer, achieve balanced fertilization, increase organic fertilizer and potassium fertilizer, adjust nitrogen fertilizer, steadily apply phosphorus fertilizer and supplement micro-fertilizer. The effect of ecological source foliar fertilizer with 600 times liquid before and after seedling setting is very good.