水稻缺锌症状:水稻缺锌与铁毒症状有相似之处,但不同地区和不同生育期的症状有差异。缺锌水稻植株一般表现为:移栽后2～3周,植株矮小发黄,抽出的叶片基部变白,有些是新叶小,中脉变白;老叶片上形成铁锈状的褐色斑点,有的全叶呈褐色,有些叶片上还长出疙瘩;分蘖数減少,根系细弱,白根少,产量降低。菲律宾的试验结果,在缺锌的水稻上,未施锌肥的处理与施锌肥的相比,株高显著下降,分蘖数约为施锌处理的一半,稻谷产量也只有施锌水稻的三分之一左右。 Zinc deficiency symptoms in rice: Zinc deficiency and iron toxicity in rice are similar, but different regions and different growth stages of the symptoms are different. Zinc deficient rice plants generally show: 2 to 3 weeks after transplanting, plant dwarf yellow, the base of the leaves out of white, some new leaves small, midrib white; rust-like brown spots formed on the old leaves, and some The whole leaf is brown, and some also grow lumps on the leaves; the number of tillers is reduced, the root system is weak, the white roots are few and the yield is reduced. In the Philippines, on the zinc-deficient rice, the treatment with no zinc fertilizer significantly decreased the plant height and the number of tillers was about half that of the zinc treatment, and the rice yield was only three One-third or so.