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据湖北钟祥县双桥原种场于1975年试验,用塘泥(pH值6.5)加入不同量的硫酸或氢氧化钠,调制成pH3～8的几种床土,匀铺在黄土旱地上,培育稻秧。前期气温平稳,除酸性过高的pH3～4的处理生育有所抑制外,其余均生长正常。播种后第16天开始,秧苗进入三叶期,气温上升,部分出现卷叶青枯死苗。播种后第20天调查,pH7、pH8两处理死苗率达41.3％和77.1％,pH5～5.6的基本没有死苗。幼苗根系生长发育的土壤环境以pH5～6.5为好,其根群分布是:在塘泥层中多数根横向生长呈“鸡爪型”,一部分向下透过塘泥层扎入底土黄土层,生长粗壮,根毛多,新根呈鲜白色。pH7～8的单株根少而长,说
According to the trial of Shuangqiao original seedling farm in Zhongxiang County, Hubei Province in 1975, different amounts of sulfuric acid or sodium hydroxide were added to the pond mud (pH value of 6.5) to prepare several bed soil of pH 3-8 and spread evenly over the loess dry land. Cultivate rice seedlings. Pre-temperature stable, in addition to high acidity pH3 ~ 4 treatment of reproduction has been suppressed, the rest were normal growth. On the 16th day after sowing, the seedlings entered the trefoil period, the temperature rose, and some of the leaves appeared. On the 20th day after sowing, the rate of dead seedlings reached 41.3% and 77.1% at pH7 and pH8, respectively. There was no dead seedlings at pH5 ~ 5.6. The root environment of the seedling root growth and development of the soil environment at pH5 ~ 6.5 as well, the root distribution is: most of the ponds in the horizontal growth of the root was “chicken-type”, part of the downward through the pond mud layer into the subsoil loess, Growing stout, root hair and more, the new root was fresh white. Plant roots with a pH of 7-8 are few and long, saying