One, nitrogen deficiency
1, symptoms
When rice lacks nitrogen, its leaf volume decreases, the plant leaves turn yellow from bottom to top, the rice plant is short, the tillers are few, and the leaves are upright.
2. Remedial measures
Immediately apply topdressing nitrogen fertilizers, apply appropriate amount of phosphorus and potassium fertilizers, and apply post-cultivation paddy fields to integrate fertilizers into the soil.
Second, phosphorus deficiency
1, symptoms
In the case of phosphorus deficiency in rice plants, the height of the plants was normal, but the leaves were dark green or purple green, and the plant type was erect and there were few tillers.
2. Remedial measures
Shallow water dressing, 30 kg of superphosphate per acre 25-30 kg of mixed ammonium bicarbonate 25-30 kilograms with mixing, applied after cultivation cultivars; shallow irrigation ground irrigation, repeated exposure to field, in order to increase ground temperature and enhance rice plants for phosphorus Absorption metabolism. After the new roots are issued, 3-4 kg of urea per mu will be used to promote the restoration of growth.
Third, potassium deficiency
1, symptoms
The leaves of potassium-deficient plants grew from bottom to top, with reddish-brown spots on the leaf veins, yellowish leaves on the lower leaves, fewer tillers from the rice plants, and short plants with dark green leaves and reddish-brown spots on the top.
2. Remedial measures
Drain immediately and apply 150 kg of wood ash per acre. After the application, immediately plough the field, or catch 7.5 kg of potassium chloride per acre. At the same time with a suitable amount of nitrogen fertilizer, and interstitial irrigation, promote root growth, improve suction fertility.
Fourth, the lack of silicon
1, symptoms
In the absence of silicon, the soluble nitrogen and sugar in the rice increased, the disease resistance decreased, and the seed setting rate decreased.
2. Remedial measures
The amount of silicon applied per mu is 100-150 kg.
V. Zinc deficiency
1, symptoms
The most obvious symptoms of zinc deficiency are the shortness of the plant, the white veins in the leaves, the obstruction of the tillers, and the slow speed of the leaves, which seriously affects the yield. Therefore, some people have included zinc as the fourth element of rice after nitrogen, phosphorus and potassium.
2. Remedial measures
Putian period before transplanting 2-3 days, 30 kg of 1.5% zinc sulfate solution per acre, foliar spray. During the heading period and heading stage, 100 grams of zinc sulfate is applied to 50 kg of water per acre.
Sixth, sulfur deficiency
1, symptoms
During the tillering stage, the rice was the most sensitive to sulfur deficiency, and the sulfur-deficient plants became significantly shorter. Simultaneously, sulfur deficiency affected rice phosphorus uptake and phosphorus conversion.
2. Remedial measures
Pay attention to the application of sulfur-containing fertilizers. Such as ammonium sulfate, potassium sulfate, sulfur and gypsum, in addition to the need for sulfur to be applied after the accumulation of fertilizer and soil is converted into sulphate, the other several kinds of 5-10 kilograms per acre can be.
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