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通过对在采自浙江省金华市的12种不同性质的水稻土添加江西省吴村磷矿粉(WPR)进行淹水培养试验,研究淹水条件下影响磷矿粉溶解和有效性的土壤因素。结果表明,磷矿粉在土壤中的溶解量与土壤pH(KCl)、交换性钙离子含量以及土壤粉粒含量呈极显著或显著的负相关,而与土壤粘粒含量呈显著的正相关。经逐步回归发现,土壤pH(KCl)是影响磷矿粉溶解的第一因素,土壤pH(KCl)和土壤磷吸附常数K共同解释了78%的磷矿粉溶解。加入磷矿粉后土壤有效磷的增加量与土壤的Olsen-P含量呈极显著的正相关。施用磷矿粉后土壤有效磷增加量占溶解量的百分比与土壤Olsen-P含量呈极显著性正相关,而与土壤粘粒含量、最大吸磷量呈显著负相关。
In this paper, WPR phosphoric acid (WPR) was added to 12 different types of paddy soils collected from Jinhua City, Zhejiang Province for flooding culture to study the soil factors that affect the dissolution and availability of phosphate rock under flooded conditions . The results showed that the dissolved amount of phosphate rock in soil had a significant or significant negative correlation with soil pH (KCl), exchangeable calcium ion content and soil silt content, but had a significant positive correlation with soil clay content. After stepwise regression, it was found that soil pH (KCl) was the first factor affecting the dissolution of phosphate rock. Soil pH (KCl) and soil P adsorption constant K together accounted for 78% of the dissolution of phosphate rock. The addition of phosphate rock soil available phosphorus content and soil Olsen-P content was extremely significant positive correlation. After applying phosphate rock powder, the percentage of soil available P uptake and the content of Olsen-P in soil were extremely significant positive correlation, but negatively correlated with clay content and maximum P uptake.