论文部分内容阅读
用吸附法测定贵州省９种土壤磷的吸附能力。结果表明，对水溶性磷的固定率在５０％以下和８５％以上；以０．２５ｍｏｌＬ－１ ＮａＨＣＯ３－０．０１ｍｏｌＬ－１ＬＥＤＴＡ－０．０１ｍｏｌＬ－１ＮＨ４Ｆ（ｐＨ８．４）混合液浸提的速效磷（Ｐ）１４ｕｇｇ－１为临界值，其三倍量为最佳施磷量进行高粱幼苗试验，相对产量在１９．３～５８．１％之间，施用磷肥的效应十分明显。磷肥效应田间试验结果表明，黔中地区汕菜、水稻和玉米的最佳施磷量在４．６～９．４ｋｇ／亩之间，磷肥产投比为２．０９～８．５６。
Determination of Phosphate Adsorption Capacity of Nine Kinds of Soils in Guizhou Province by Adsorption. The results showed that the immobilization rate of water-soluble phosphorus was less than 50% and more than 85%. The contents of available phosphorus in the mixture of 0.25molL-1 NaHCO3-0.01molL-1LEDTA-0.01molL-1NH4F (pH8.4) (P) 14ugg-1 as the critical value, the three times the best amount of phosphorus for sorghum seedling test, the relative yield of 19.3 ~ 58.1%, the effect of phosphate fertilizer is very obvious. The results of field experiments showed that the best phosphorous content of Shantou, rice and maize was 4.6 ~ 9.4kg / mu in Qianzhong area, and the ratio of phosphate fertilizer production was 2.09 ~ 8.56.