论文部分内容阅读
潜育性水稻土有效磷含量比非潜育性者低50～90％;有效磷占全磷的比例和植株吸磷量都比非潜育性水稻土低。水稻土中以Fe—P与有效磷的相关系数最大,依次为Al—P、O—P和Ca—P。潜育性水稻土上Fe—P、O—P(酸性土)、Al—P及有机磷量均低于非潜育性水稻土,与有效磷的趋势一致,是其缺磷的主要原因。潜育性水稻土对磷的吸附固定能力强,磷酸吸持容量高,无定形铁含量高。这是潜育性水稻土缺磷的又一重要原因。
The content of available phosphorus in the fertile paddy soil was 50-90% lower than that in the non-poorly fertile paddy soil. The ratio of available phosphorus to total phosphorus and plant P uptake were lower than those in non-soilless paddy soil. The correlation coefficient of Fe-P and available P in paddy soil was the largest, followed by Al-P, O-P and Ca-P. The content of Fe-P, O-P (acid soil), Al-P and organic phosphorus in the glebe in paddy soil were all lower than those in non-gneisonic paddy soil, which was consistent with the trend of available phosphorus. The potential of paddy soil to adsorb and fix phosphorus is high, the capacity of phosphate adsorption is high and the content of amorphous iron is high. This is another important reason for phosphorus deficiency in gneissic paddy soils.