In the process of watermelon growth, yellow leaves often appear. To analyze the reasons, there are mainly the following points. Collagen is the most abundant protein in mammals, accounting for 25% to 30% of the total protein. It is widely present in all tissues from the body surface of lower vertebrates to mammalian bodies. Collagen monomers are long cylindrical proteins with a length of about 280 nm and a diameter of 1.4–1.5 nm. It consists of 3 polypeptide chains that are supercoiled around each other. Collagen,Collagen Peptides,Collagen costco,Collagen Peptide Products YT(Xi'an) Biochem Co., Ltd. , https://www.ytlinkherb.com
One is the yellow leaves caused by herbicides. Watermelon is an annual herb, generally after the emergence of seedlings using selective herbicides, should be strictly controlled when transplanting the order of operation, ridging ridiculous spraying herbicide, and then digging hole planting, so that when planting can open the soil table with herbicides Soil layer to avoid damage to the watermelon root system. In the northern protected area, small sheds are planted with watermelons. When using herbicides, double membranes should be used, that is, a layer of plastic film on the ground. This mulch can effectively press the transpiration of the herbicide under the membrane without affecting the growth of the watermelon. For the use of herbicides for the purpose of a membrane that is dual-use, that is, the early stage of the local membrane in the arch shed. In a confined environment, water vapor transpiration and herbicide fumigation, harmful gases will inhibit growth of watermelon seedlings and make the leaves yellow. Prevention and control methods, first, timely release, breathable; Second, every 667 square meters with "golden micro" microbial agents 5 kg, irrigation watering roots.
The second is the improper use of fertilizer to cause yellow leaves. In order to obtain high yields of watermelons, melon farmers tend to use chemical fertilizers in excess, and use chicken manure in excess, especially watermelons in sheds. The use of manure is even greater. Due to the use of unfamed human and animal manure, or long-term large-scale application of chemical fertilizers, fertilizers cause excessive root damage. Some of them also use too much foliar fertilizer, because many foliar fertilizers contain hormone substances, causing watermelon hormones and micro-fertilizer poisoning, making the leaves rigid, green, brittle, deformed, yellow leaves and sheaths. Prevention methods: First, it is forbidden to use unfamiliar human and animal feces, and must be fully fermented before use. Second, when applying chemical fertilizers, it is best to adopt formula fertilization, and appropriate increase of phosphorus and potassium fertilizers. When using base fertilizer, nitrogen fertilizer should not be too much to prevent Burning roots; Third, the discovery of fertilizer burning root, should be timely irrigation of microbial agents, with 5-10 kg per 667 square meters, with water flushing can be. For the rot yellow leaves caused by the application of raw manure, membrane-break ventilation measures should also be adopted to reduce gas damage.
The third is the lack of yellow leaves. In recent years, the continuous cropping of watermelons has become more serious, and it is easy to cause lack of supply. The common nutrient deficiency of watermelon is potassium deficiency, calcium deficiency, boron deficiency, and iron deficiency, which will cause yellow leaves of different degrees. Prevention and control methods, first, try not to continue cropping; Second, for the continuous crop of watermelon, in the use of NPK fertilizer, every 667 square meters as much as possible to apply "God 6 54" mineral fertilizer 50 kg, to supplement the deficiency of trace elements; Watermelon seedlings that have already experienced symptoms of nutrient deficiency can be sprayed with “Golden Micro†composite microbial fertilizer 300 times, or “Golden Micro†multi-purpose 350 times liquid plus Indian calcium 500 times, which is obviously to prevent the symptoms of watermelon deficiency. effect.
Fourth, yellow salt is caused by soil salt damage. Salt damage in the soil occurs in greenhouse watermelon sheds, and exposed watermelons occur in continuous plots. Long-term application of chemical fertilizers or excessive application of chicken, cattle, and duck manure, salt damage will often be more serious. Salinized land is generally white and red. Watermelon growth in salinized land will show slow growth, dwarfing, dark green leaves, and leaf margins. Dry symptoms. One of the methods of prevention and control is rotation. It is best to rotate with non-guay crops, especially for paddy crops. Appropriate application of chicken manure and cow dung; second, use of microbial agents to improve the soil, it is recommended that no 667 square meters with "micro-micro" microbial agents or "De Yimin" soil conditioner 20-30 kg, ditch application or acupuncture Watermelon roots can effectively reduce salt alkali and promote watermelon root growth.
The fifth is the red spider's damage caused by yellow leaves. Scarlet spider mites and larvae concentrate on the back of young leaves to suck the juice of watermelon leaves, especially buds, young leaves, and flower buds that have not yet been unfolded. The leaves that are sucked by red spiders lose their green and yellow, and they can make the leaves dry when severe. The prevention and cure methods are: first, eradicate the weeds around the watermelon field and cut off the source of insects; second, the life cycle of red spiders is short, and the fertility is strong; pay attention to early prevention and control; 1.8% of Insecticides can be used for 2000-3000 times, or 2% Vermicularin 1500-200 times foliar spray.