Zinc deficiency in rice, first appeared in the middle part of the lower leaves, chlorotic yellow spots, reddish-brown spots and irregular plaques, then gradually expanded into reddish-brown streaks, reddish brown from the tip of the leaves, dry, and from the bottom Leaves up the leaves in turn. The leaf speed of the diseased plant is slow, the new leaves are short and narrow, and the leaves are light, especially the yellow veins near the base vein. The leaf occipital distance of seriously ill plants is shortened or dislocated, and it is obviously dwarfed, rarely distributed, and the field often shows unevenness. The zinc fertilizer application in rice fields must master the following technical requirements:
1. Apply only in zinc-deficient rice fields. Generally speaking, calcareous soil is rich in calcium and has a high pH value, while effective zinc easily combines with carbonate or hydroxide to form zinc carbonate or zinc hydroxide, which becomes ineffective, so zinc is often deficient; The paddy fields are prone to zinc deficiency; in the long-term application of nitrogen and phosphate fertilizers, the effective zinc is also reduced. The above types of paddy fields should be supplemented with zinc fertilizer.
2. Apply in moderation. Zinc sulphate should be used for the application of zinc fertilizer in rice fields, generally 1 to 1.5 kg per acre. Since zinc fertilizer has obvious aftereffect, zinc fertilizer can be applied once every 2 to 3 years.
3. Zinc fertilizer should be applied early. The application of zinc fertilizer in Daejeon is best carried out in the field of Putian, and the application of zinc fertilizer in Putian is high in utilization rate and good in effect.
4. The application should be uniform. Zinc fertilizer can be mixed with physiological acid fertilizer, but it should not be mixed with phosphate fertilizer to avoid the formation of zinc phosphate which is difficult to absorb and utilize in rice to reduce fertilizer efficiency.
5. Foliar spray concentration should be appropriate. Spraying zinc fertilizer as foliar fertilizer is the main method of topdressing. The suitable concentration of zinc sulfate is 0.1% to 0.2%.
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