Peanut production is very sensitive to the response of phosphorus, and the effect of increasing the application of phosphate fertilizer is significant. The soil phosphorus content is an important factor in determining peanut yield. Pay attention to the effect of fertilizer effect, pay attention to the application of fertilizer, re-apply organic fertilizer, pay attention to the application of nitrogen, phosphorus and potassium formula fertilization, foliar fertilizer and micro-fertilizer.
Foliar fertilization. Leaf color change: dark green - yellow green - dark green - yellow. In the fruit period, the soil fertility is insufficient, and the nitrogen and phosphorus in the stems and leaves are excessively transported to the nuts, causing premature senescence in the shoots, exacerbation of leaf spot disease, early defoliation, and poor fruit filling.
Application of trace element fertilizers. Promotion work: scientific application of NPK, attaching importance to the addition of trace elements such as boron and zinc. Specific measures should: stabilize nitrogen, reduce phosphorus, increase potassium, and supplement micro (boron, zinc).
Boron deficiency symptoms. The growth of the shoot tip growth point was inhibited, and it was withered in severe cases, and the plant shape was short and "cluster". The leaves of the old leaves become thick and brittle, deformed, and the branches are short, and the cork is formed. The stems and roots have obvious cracks.
Molybdenum deficiency often shows symptoms of nitrogen deficiency. Poor growth, short plants, chlorosis between veins, malformation of leaves, whole leaves covered with spots, old leaves thickened, scorched, resulting in death. Soak seeds or seed dressings with ammonium molybdate or sodium molybdate 0.1%-0.2% solution.
Iron deficiency. Symptoms: Peanut iron deficiency begins to lose green and yellow from the young leaves, and the leaves are yellow and green. It occurs mostly in alkaline soil or after heavy rain, and the plant develops faster. Generally, 7.5-15 kg of ferrous sulfate per hectare can be used as base fertilizer, 0.1% ferrous sulfate solution is soaked for 12 hours, and 1%-3% ferrous sulfate or bismuth iron solution is sprayed on the leaves when the new leaves are yellow. Spray once every 1-2 weeks and spray 2-3 times continuously.
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