Greenhouse melon magnesium deficiency
The lack of magnesium in soil is the main reason for the lack of magnesium in melons. The lack of magnesium in soil is related to the soil texture. The second is related to the acidity and alkalinity of the soil. Low temperatures can also cause magnesium deficiency. When the local temperature is below 15°C, root growth of melons is hindered. At this time, although there is no shortage of magnesium in the soil, root growth and development of melon is not good, and it will also inhibit the root system of magnesium. absorb. In addition, when potassium and ammonium fertilizers are applied excessively to melon, the absorption of magnesium ions by melons is inhibited, thereby inducing magnesium deficiency in plants. There are three methods for prevention and control:
1. Supplemental application of magnesium fertilizer on the field of insufficient supply of magnesium in the soil, can be transplanted before the melon seedlings colonization, with the basal magnesium fertilizer supplemented with 2-4 kg of magnesium sulfate, or in the base fertilizer increased calcium magnesium phosphate fertilizer. The combination of phosphate fertilizer and magnesium fertilizer is helpful for the absorption of magnesium.
2. Control of nitrogen and potassium fertilizers For soils with low magnesium content, excessive application of nitrogen and potassium fertilizers should be avoided. During the growth of melon, a small number of multiple application methods for nitrogen and potassium fertilizers are preferred.
3. Raise the temperature of greenhouses Increase the temperature of greenhouses through measures such as late-exposure curtains and early-release curtains. In particular, after melons and melons are inflated, they must keep the temperature above 15°C. To improve the absorption of magnesium.
4. The foliar spray fertilizer can be used to spray the 0.5-1% magnesium sulphate solution in the greenhouse where the symptoms of magnesium deficiency in melons have already appeared. It can be applied once every 5-7 days for 3-4 times.
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