摘要
以沙土盆栽试验研究了微细磷矿粉提高土壤速效磷含量及其生物有效性。结果表明:磷矿粉有效磷含量、水溶性磷含量及土壤速效磷和水溶性磷含量随颗粒细度提高而提高,特别是大部分颗粒细度在20μm以下时,有效磷和水溶性磷含量增幅较大,越是难溶的磷矿粉提高幅度越大。当磷矿粉粒度达到大部分在20μm以下时,与0.100～0.075 mm粒度所含有效磷相比,绵竹和昆阳的磷矿粉分别提高6.97和6.09倍,怀化和晋宁的磷矿粉分别提高5.96和2.64倍,安宁和开阳的磷矿粉分别提高2.59和0.84倍;6个产地的磷矿粉的水溶性磷含量提高1.20～8.56倍;晋宁和开阳的磷矿粉对产量贡献率分别提高24%和10%左右,而且分别提高土壤速效磷含量130%和53%。
In a sandy soil pot experiment a study is made of the increase by very fine ground phosphate rock in quick-acting phosphorus content of the soil and biological effectiveness. The results show that the available and water-soluble phosphorus content of ground phosphate rock and the quickacting and water-soluble phosphorus content of the soil increase with the fineness of the particles, especially when the majority of the particle fineness is below 20 μm, the available and water-soluble phosphorus content rises by a big margin, and the lower the solubility of the rock, the bigger the margin. when the majority of the particle size of the rock is below 20 ixm, as compared with the available phos-phorus content of 0. 100 - 0. 075 mm particle size, that of Mianzhu and Kunyang rocks increases respectively by 6.97 and 6.09 times, that of Huaihua and Jinning rocks by 5.96 and 2.64 times, that of Anning and Kaiyang rocks by 2.59 and 0.84 times ; the water-soluble phosphorus content of rocks from these six laces increases by 1.20 - 8.56 times ; the contribution rate of output from Jinning and Kaiyang rocks increases by about 24% and 10% respectively, and the quick-acting phosphorus content of soil by 130% and 53%.
出处
《化肥工业》
CAS
2010年第6期18-22,25,共6页
Chemical Fertilizer Industry
基金
国家"973"(2005CB121102)
"支撑计划项目"(2006BAD25B07)
"863"计划(2006AA10Z417)
关键词
微细磷矿粉
沙土
磷有效性
very fine ground phosphate rock sandy soil phosphorus availability
