In recent years, the phenomenon of premature aging of mulch has increased, becoming a prominent issue affecting the yield and quality of cotton. Analysis of the reasons, in addition to farming, fertilizer and water factors, generally do not remove the film, uncover the film late or improper method has a great relationship.
Correct understanding of the role of plastic film mulching can increase ground temperature, prevent soil moisture from evaporating, make deep soil moisture accumulate, increase plough layer soil moisture, prevent rainwater seepage in case of rain, increase surface runoff, and maintain soil moisture in a relatively stable state. , Suppresses the salt accumulation process of soil evaporation, promotes the activity of microorganisms, accelerates the decomposition and transformation of soil nutrients, and improves soil fertility. Film-covered warming, moisture retention, alkali inhibition, wind protection, and rain protection are the main safeguards for cotton seedlings.
One of the benefits of removing membranes and soils is to remove the active roots of part of the shallow surface soil through uncovering the membrane and combining with loosened soil. Not only does it play a role in controlling Wang, but it can also stimulate the main root to pull down faster and deeper, so that the lateral root extension The longer, more widely distributed, is conducive to achieving deep rooted leaves, more than Leibo does not lead to premature aging; the second is to remove the film, soil is conducive to improving the root growth environment, in July and August, rain, rain, large, not exposed The mulching cotton field is prone to the formation of alum dark stains, poor soil air permeability, resulting in obstructed root respiration and causing abortions to fall off. Uncovering cotton and soil that cultivates soil is conducive to drainage and irrigation, which can improve the microclimate of the cotton field. It is very beneficial to reduce shedding, reduce bad bells, and maintain the normal growth of cotton plants.
How to remove the film on a timely basis, too early, can not make full use of light and heat resources, plastic film does not achieve the maximum value; too late to remove the film, weakened ability to restore the roots, too much rooting, easy to plant hidden dangers of late aging. The film is generally removed at the bud stage. Should be flexible according to the actual situation, the general cotton field should be in the budding period of cotton plant (in mid-June) to remove film; cotton field humidity can be appropriately advanced, in the first half of June to remove the film is appropriate; heavy salt alkali and arid area of ​​the film Cotton can be uncovered and covered in full growth period. Uncovering membranes should be combined with watering, deep cultivating and cultivating rows between rows, and earthing should be carried out in different stages. See the end of the soil when the flower is finished. The height of the soil is 14 to 16 cm in order to facilitate watering and drainage.