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Iron fertilizer: When iron is deficient, the plant is short, with few branches, late flowering, less flowering, less nodules, poor root development, and 1 to 3 leafy mesophyll parts below the heart leaf are obviously chlorotic, but the veins are still green. In severe cases, the veins are chlorotic and yellow, and the upper leaves are yellowish white. The leaves appear brown necrotic spots for a long time until the leaves die. The application of iron fertilizer on iron-deficient soil can generally increase peanut yield by more than 10%.
Application method:
1 for base fertilizer. When preparing the soil, apply 200-400 grams of ferrous sulfate per mu (mixed with organic fertilizer or superphosphate);
2 for seed fertilizer. Before sowing, soak seeds with 0.1% ferrous sulfate solution for 24 hours, remove and dry the seed coat after sowing;
3 external sprays. When the symptoms of yellowing occur in the peanut flowering period, the pod-forming stage or the new leaves, the 0.2% ferrous sulfate solution is sprayed on the foliar surface, usually every 5 to 6 days, and sprayed continuously for 2 to 3 times.
Boron fertilizer: When boron is deficient, the plant is short, with many branches and clusters. The heart veins are light in color, the rest are dark, light green, the leaves are small and shrink, the leaves are yellow and gradually expand outward. The leaves are dry and the leaf pillows have brown marks, so that the petioles can not stand upright or even droop, the old leaves are gray, the plants are less flowering or even without flowers, the roots are easy to age, the ability to expand is weak, the roots are few, and the root tips have black spots. It is easy to be necrotic, and the nuts are bad; it is easy to form hollow fruit with shell and no kernel. Application of boron fertilizer on boron-deficient soil can increase peanut yield by 7.8-22.5%.
Application method:
1 for base fertilizer. Apply boric acid or borax 0.2 to 1 kg (mixed with organic fertilizer or nitrogen or phosphate fertilizer);
2 for seed fertilizer. Before sowing, soak seeds with 0.02~0.05% boric acid or borax solution for 4-6 hours, or mix 0.4 kg of boric acid or borax per kg of peanuts;
3 for topdressing. 50-100 grams of boric acid or borax per acre, mixed in a small amount of decomposed organic fertilizer, applied before flowering; 4 external spraying. Foliar application of 0.2% boric acid or borax solution in peanut seedling, initial flowering and full bloom.
Manganese fertilizer: When manganese is deficient, the veins of the leaves are partially yellowed, while the veins tend to remain green. Applying manganese fertilizer to manganese-deficient soil can increase peanut yield by 8-11%.
Application method:
1 for base fertilizer. When the soil is prepared, 1.5 to 3.0 kg of manganese sulfate is applied per mu;
2 for seed fertilizer. Soaking seeds with 0.05-0.1% manganese sulfate solution for 12-24 hours before sowing;
3 external sprays. From 30 to 50 days after sowing of peanuts, 15 to 20 days before harvest, spray with 0.1% manganese sulfate solution every 10 to 14 days; if necessary, mix with fungicides for controlling peanut leaf spot.
Zinc fertilizer: When zinc is deficient, the leaves are stripped chlorotic, and the strip is usually on the leaf closest to the petiole. In severe cases, the whole leaflet is chlorotic. Applying zinc fertilizer to zinc-deficient soil can increase peanut yield by 12.5 to 13.2%.
Application method:
1 for base fertilizer. When preparing the soil, apply 1 kg of zinc sulfate per mu;
2 for seed fertilizer. Before sowing, soak seeds with 0.1-0.5% zinc sulphate solution for 12 hours, remove and dry the seed coat for sowing.
Trace elements play an important role in the growth and development of peanuts (such as nitrogen, phosphorus, potassium, etc.). The scientific application of trace element fertilizers is an important measure for high quality and high yield of peanuts.
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