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对桃源县几种母质发育的低产和正常稻田土壤磷素状况的调查表明:低产田土壤速效磷平均为6.2ppm,只有正常田的46.6％;Al—P和Fe—P分别平均为10.7ppm和38.0ppm,只相当于正常田的45.5％和28.8％,而O一P含量则高于正常田;低产田土壤有机磷占全磷的比例为53.4％,亦高于正常田。正常田中各种形态的磷,除O—P和Ca—P外,都与早稻分蘖期的植株含磷量呈显著相关,低产田的相关性不明显。低产田早稻分蘖期吸收的磷量只有正常植株的26.3％,占氮磷钾吸收总量的比率也低于正常植株。
The investigation on the status of phosphorus in low and normal paddy soils in Taoyuan County showed that the available phosphorus content in low-yielding soils was 6.2ppm on average, only 46.6% of that in normal soils. The average contents of Al-P and Fe-P were 10.7ppm and 38.0ppm, which is only equivalent to 45.5% and 28.8% of normal fields, while the content of O-P is higher than that of normal fields. The proportion of organic phosphorus to total phosphorus in low-yield fields is also 53.4%, which is also higher than that of normal fields. All kinds of phosphorus in normal Tanaka, except O-P and Ca-P, were significantly correlated with phosphorus content in early-tillering rice plants, while the correlation was not significant in low-yielding fields. The amount of phosphorus absorbed by tillering stage of low-yielding early rice was only 26.3% of the normal plants, which was lower than that of the normal plants.