Release characteristics of activated calcium-magnesium phosphates and its effects on growth of potted corn | 活化钙镁磷肥的养分释放特点及其对玉米生长的影响

chinois. 摘　　要：通过4种活化剂（WZ、SMS、MSN、FM）对钙镁磷肥进行促释处理,采用连续浸提、盆栽试验分别对活化钙镁磷肥的水溶性磷释放量、肥效及磷效率进行了研究。连续浸提结果表明：活化钙镁磷肥处理每次的水溶性磷释放量总体上高于钙镁磷肥,且释放均衡稳定;4种活化钙镁磷肥的累积磷释放量增幅达22.5%-51.8%。2茬盆栽试验表明：与钙镁磷肥相比,4种活化钙镁磷肥的玉米生物量均提高;植株吸磷量均高于过磷酸钙和钙镁磷肥处理,植株的叶绿素和镁含量也均比钙镁磷肥提高,同时活化钙镁磷肥处理的后效明显;与钙镁磷肥处理相比,活化钙镁磷肥的水溶性磷含量、生物量、吸磷量、土壤有效磷均有不同程度的提高,可提高磷肥利用率,第2茬效果优于第1茬,其中SMS促释钙镁磷肥的效果最好。

anglais. Four kinds of activating agents（WZ,SMS,MSN,FM） were used to promote the release of calcium-magnesium phosphate（PRCMPs）.Continuous water extraction and potted corn were used to study the contents of water-soluble P,fertilizer effect and phosphorus efficiency of PRCMPs.The result of continuous water extraction indicated that the content of water-soluble P of PRCMPs was higher and more stable each time compared to calcium-magnesium phosphate.The accumulative rate of release increased from 22.5% to 51.8%.The result of potted experiments showed that the biomass of potted corn from four PRCMPs were much higher than that of calcium-magnesium phosphate.Compared to calcium-magnesium phosphate,the uptaking of P of PRCMPs was improved.The contents of Mg and chlorophyll of PRCMPs were high as well.Furthermore,the residual effects of PRCMPs increased.Compared to calcium-magnesium phosphate,the contents of water-souble P,biomass of sweet corns,phosphorus uptake and soil available phosphorus were higher.The use effeciency of phosphorus also increased.The effect of the second pot experiment was better than that of the first.Among the PRCMPs,the effect of PRCMP of SMS is the best.