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Anonymous users2024-02-12It will lead to the growth of watermelon, encounter some problems, and will lead to a decrease in the yield of watermelon, and will also lead to some diseases, which will lead to the growth of watermelon in a bad state, and will also cause watermelon to grow small. Fertilization can be carried out, watering can be carried out, and it is necessary to pay attention to the control and the process of fertilization.
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Anonymous users2024-02-11This may lead to overall stunting, which can lead to low yields; The cause of yellowing of the leaves may be potassium deficiency, malnutrition, improper fertilization, lack of water, and lack of access to adequate light conditions; If you want to effectively control it, you should supplement some potassium, calcium, and boron as much as possible, and there should be regular fertilization and watering to effectively control pests and diseases.
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Anonymous users2024-02-101. The yellowing of watermelon leaves is generally caused by improper fertilization, lack of nutrients, pests and diseases, etc.
2. Improper fertilization: the use of unrotted farmhouse fertilizer or long-term use of a large number of chemical fertilizers, resulting in more fertilizer and root burning; Or excessive use of inferior foliar fertilizer, resulting in hormone poisoning of the plant, so the leaves will be green, yellowing and other phenomena.
3. Lack of nutrients: due to the lack of potassium, calcium, boron and other elements in the soil due to continuous cropping, the plants will have yellow leaves.
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Anonymous users2024-02-09If there is a lack of nutrients, it is enough to spray foliar fertilizer, and a large area is characterized by the same surname. The yellowing virus is spread rapidly from an individual and uses this.
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Anonymous users2024-02-085 Causes of Watermelon Yellow Leaves:
Timely ventilation, ventilation, foliar spraying of alginic acid and foliar fertilizer;
Select appropriate compound beneficial microbial agents, alginic acid, melt dimel (monosilicic acid), etc., and water them after irrigating the roots or rinse them with water.
The second is to burn the roots with improper fertilizer, resulting in yellow leaves. Prevention and control methods: it is strictly forbidden to apply unrotted manure, it must be fully fermented in advance, and then applied, it can be used to stimulate antibacterial 968 fertility and so on, spray a starter agent every 20-20 cm of manure, mix with an appropriate amount of crushed straw, ferment after irrigation and wetting, turn over the pile in time when the temperature is high, and ferment can be completed in 15-20 days.
or directly sprinkle into the soil and then apply the fermentation agent, and treat it at high temperature for more than 15 days; When applying chemical fertilizers, it is best to take formula fertilization, appropriately increase calcium and magnesium fertilizers, and when using base fertilizers, nitrogen fertilizers should not be too much to prevent root burning; If it is found that the fertilizer burns the roots, it should be irrigated with microbial agents in time, and 5-10 kg of manure starter per mu should be used with water. For the rotten roots and yellow leaves caused by the application of raw manure, the method of breaking the membrane and ventilation should also be adopted to reduce the air damage.
The third is the lack of nutrients that causes yellow leaves. Prevention and control methods:
rational crop rotation; For continuous cropping plots, appropriate medium and trace element mineral fertilizers are used to supplement the deficiency of medium and trace elements while using nitrogen, phosphorus and potassium fertilizers. For watermelon seedlings that have developed symptoms of nutrient deficiency, foliar fertilizer can be sprayed in time, combined with the application of medium and trace element fertilizers, which has a better effect on preventing nutrient deficiency symptoms.
Fourth, soil salt damage causes yellow leaves. Control method: crop rotation and stubble.
It is best to rotate with non-melon crops, especially water-to-dry rotation. Appropriate application of sheep manure and cow manure to reduce the use of chicken and duck manure; Improving the soil with microbial agents, peat, straw, etc., and applying furrow or hole application to watermelon roots can effectively reduce salinity and alkali and promote the growth of watermelon roots.
Fifth, red spider damage causes yellow leaves. Control methods: eradicate weeds around the watermelon field and cut off the source of insects; Spider mites have a short life cycle and strong fecundity, pay attention to early prevention and control, and can use avermectin, spirodifen, ethoxazole, acetazole and other foliar sprays.
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