摘要:
为研究硫对水稻产量的影响,确定缺硫诊断指标,进行了水培和大田试验。结果:①施硫可提高水稻有效穗、结实率和千粒重,产量较缺硫处理有极显着的增加;有效硫含量中等的沙质田,硫肥(石膏)用量以含纯S15kg/hm2为宜。②不同生育期缺硫对水稻产量的影响不同,分蘖期缺硫对产量影响最大,其次是苗期和抽穗期,生产上硫肥宜作基肥施用。③水稻缺硫诊断的适宜部位是叶片,分蘖期水稻硫素营养诊断的临界值是:硫酸盐硫(S)190μg/g,全硫(S)0.11%;N/S比值31。
Abstract:
The field and hydroponic experiments were conducted to confirm the effect of sulfur on rice grain yield and diagnostic index of sulfur deficiency,the results showed as follows: ①Fertilization of sulfur enhanced the number of effective panicles,percentage of filled grain and 1000 grain weight,significantly increased the grain yield.In sandy soils,which contained medium available sulfur,the proper doses of sulfur fertilizer was 15 kg per hectare. ②The effect of sulfur deficiency on rice grain yield was more serious at tillering stage than that at seedling and ear developing stage.Sulfur fertilizer should be applied as basic fertilizer. ③The proper organ for sulfur diagnosis was rice leaves.Total sulfur,sulfate sulfur and N/S ratio could be used for sulfur diagnosis and the critical levels were 0.11%,190 μg/g and 31 respectively at tillering stage.
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