硫是植物不可缺少的营养元素,它的作用与氮、磷、钾一样重要。近几年来,云南省部分低产冷浸田中的稻田上发生缺硫症,群众称为“黄叶病”。轻微缺硫,一般症状不明显,仅表现出产量减低,严重缺硫时,移栽后幼苗出现明显叶黄,叶尖为茶黄色。返青延迟一星期,返青后幼叶叶尖普遍干枯,枯尖下端的一段叶片呈现不规则的褐斑,分蘖迟缓,少或无分蘗,植株矮而瘦弱,生长发育中期表现为叶片狭窄。根呈木质化,根毛少,扬花期晚十天,成熟期延迟,成穗数和穗粒数明显降低,籽实青瘪,严重影响产量。 Sulfur is an indispensable nutrient element of plants, and its role is as important as nitrogen, phosphorus and potassium. In recent years, some low-yielding paddy fields in Yunnan Province, rice fields on the occurrence of sulfur deficiency syndrome, the masses called “yellow leaf disease.” Slightly lack of sulfur, the general symptoms are not obvious, only showed a decrease in yield, serious sulfur deficiency, the seedlings after transplanting obvious yellow, tip of the tea yellow. Retreated green delay of a week, young leaves after rejuvenation generally dry leaves, the lower tip of a section of leaves showed irregular brown spots, tillering less, or without tillers, plants short and thin, mid-growth performance for the blade stenosis. Roots were lignified, root hair less, flowering late ten days, the maturity of the delay, the number of spikes and grains decreased significantly, the seed shriveled, seriously affecting the yield.