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选择黄棕壤、红壤、灰潮土和水稻土等湖北省四种主要土壤类型,对油菜和水稻分别进行盆栽和田间硫肥试验。试验结果表明:黄棕壤、红壤和灰潮土三种土壤盆栽油菜施用硫肥后,均能促进油菜的生长发育并增加油菜的干物重,但总体上施石膏的效应比施硫磺要好。水稻土田间水稻硫肥试验后,明显提高了水稻产量,但施硫磺粉的效果要比施石膏好,前者的增产率达到27.44%,后者是14.88%。试验前后土壤有效硫的变化进一步说明施用硫肥可以维持土壤硫素平衡,满足作物营养需求。使用澳大利亚KC l—40方法测定土壤有效硫含量,能反映土壤供硫水平与作物产量的相关性,这对于指导我国农业生产具有重要的意义。
Four main soil types in Hubei Province, such as yellow brown soil, red soil, gray tide soil and paddy soil, were selected. The pot and field sulfur fertilizer experiment of rapeseed and rice were conducted respectively. The results showed that the application of sulfur fertilizers in pots of yellow brown soil, red soil and gray tide soil could promote the growth and development of rape and increase the dry weight of rapeseed. However, the effect of gypsum was better than that of sulfur. Rice paddy field rice fertilizer test significantly improved the yield of rice, but the application of sulfur powder better than the cast paste, the former yield of 27.44%, the latter is 14.88%. The changes of soil available sulfur before and after the experiment further indicated that sulfur fertilizer could be used to maintain the balance of sulfur in the soil to meet the crop nutrient requirements. The determination of available sulfur in soil by KC-40 method in Australia can reflect the correlation between soil sulfur supply and crop yield, which is of great significance for guiding agricultural production in China.