Rice seedling deficiency symptoms and remedies

The abundance of rice fertilizer usually refers to nitrogen, phosphorus, potassium and zinc. The shortage of nitrogen, phosphorus, potassium and zinc will cause different symptoms of rice plants. According to these performances, nutrition diagnosis can be carried out and corresponding remedies can be taken. Measures.

Nitrogen-deficient rice seedlings lack nitrogen, usually start from the tip of the old leaves to yellow, and finally the whole plant leaves fade, the lower leaves are yellow; the leaves are narrow and short, erect, the plant type is short and thin, the leaves are slow, and the leaves are less Late, the roots are slow and the yellow roots are more. Nitrogen deficiency and yellowing occur mostly in yellow mud fields or in shallow mud feet and in areas with insufficient base fertilizer. In the case of the above symptoms, the quick-acting nitrogen fertilizer should be applied in time, and the phosphorus and potassium fertilizer should be applied in combination. The acre is mixed with 25 kg of ammonium bicarbonate or 10 kg of urea, and uniformly applied to the field in the 20-deep pig manure water.

After the transplanting of the phosphorus-deficient seedlings, the yellowing does not turn green, and there are few tillers or greenings, and the leaves are thin. In severe cases, the leaves are curled and folded along the veins, and the leaves are dark and green until the leaves are blue-purple, rice. The seedlings are clustered, short and thin, and the leaves are short and the leaves are short, the roots are short and thin, and the new roots are few. Should be placed in shallow water and top dressing, using calcium phosphate sieving powder per acre 30 kg mixed with ammonium bicarbonate 30 kg with mixing, shallow water drying field to increase surface temperature, accelerate the absorption and metabolism of phosphate fertilizer.

Although the potassium deficiency seedlings lack potassium, the roots can turn back to green, but the leaves are yellow with brown spots. The yellow leaves have small reddish-brown spots at the tip and leaf edge. After each new leaf grows, it will increase the lesion of an old leaf. The plant leaves only a few new leaves to keep green. The main roots and branching roots of the diseased plants are short and weak, and the roots are yellowish brown to dark brown with almost no new roots. Potassium deficiency occurs mainly in cold soaked, sludged and rusted paddy fields. It should be drained immediately, 150 kg of grass wood ash (when there is dew in the morning), or sprayed with potassium dihydrogen phosphate 2 2 / mu, and 60 kg of water spray. At the same time, it can also be combined with nitrogen fertilizer, shallow water to dry the field, increase oxygen and promote roots, and improve the ability to absorb fertilizer.

The seedlings lacking zinc and zinc deficiency first appeared in the middle part of the lower leaves, with chlorotic yellowish whitening, upper yellowish brown spots and irregular plaques, and then gradually expanded into reddish-brown strips, which turned red and brown from the tip of the leaves. And from the lower leaves to the upper leaves in turn; the leaf speed of the diseased plants slowed down, the new leaves were short and narrow, the leaves were chlorotic, especially the basal midvein was yellowish white, and the roots were brown. Remedy: Immediately drain the field, aerate the ventilation, and promote new roots. And spray with a 0.2% zinc sulphate solution foliar spray every other week, twice in a row.

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