Effects Of Several Mineral Conditioners On Soil Nutrition, Enzyme Activity And Microbe Characteristics

Four kinds of representative mineral source soil conditioners currently produced commercially inChina were chosen in this paper, for which a laboratory incubation experiment was conducted to studythe effects on soil nutrition, enzyme activity, microbial properties and plant, aimed at the evaluation andmanagement of the industry to provide technical support. Research shows the tested soil content ofavailable phosphorus content, exchangeable calcium content, soil enzyme activity（urease, alkalinephosphatase and catalase）were all increased significantly with application of oyster shell conditioner.The main results are as follows:1、The condition of constant incubation experiment showed, the soil pH value was significantlyincreased for use of medical stone, calcium silicate mineral and oyster shell conditioners, remainedrelatively stable level in90days. Compared to the control, the soil pH value was increased by anaverage of0.87,1.47and1.50respectively under2%amount of those conditioners. If the amount was4%, the value was increased by an average of1.19,1.44and1.44respectively. However, the soil pHvalue declined significantly by an average of0.76,1.20under2%,4%amount of montmorilloniteconditioner respectively.2、The condition of constant incubation experiment showed, the soil available phosphorus,exchangeable calcium, magnesium and trace element contents were influenced by the conditioners.Application of medical stone, calcium silicate mineral and oyster shell conditioners can significantlyincrease the content of soil available phosphorus, the oyster shell conditioner showed the best effect.The average relative increasing rate was36.1%,42.3%under2%,4%amount of oyster shellconditioner compared to the control. On the contrary, the soil available phosphorus content significantlydeclined with using montmorillonite conditioner, the greater decline reached15.6%. For theexchangeable calcium, the contents were improved significantly, the value was between19.1%~112.3%,the oyster shell conditioner showed the best effect. On the contrary, exchangeable magnesium contentswere reduced with those conditioners; the average relative increasing rate was between-1.4%~-8.9%.For the trace elements, the contents were improved only by montmorillonite conditioner, the averagerelative increasing rate was7.4%,15.5%,49.6%and41.7%respectively（available copper, availableiron, available manganese, available zinc）under2%amount. If the amount was4%, the value was20.0%,29.5%,66.7%and57.0%respectively.3、The soil urease, alkaline phosphatase and catalase activity were significantly increased for use ofoyster shell conditioner. The enzyme activity of soil urease, alkaline phosphatase and catalase wasincreased by81.9%,4.7%and5.1%under2%amount of oyster shell conditioner compared to thecontrol respectively. If the amount was4%, the value was119.8%,12.3%and5.1%respectively. Themicroorganism amount was increased by64.1%for use of4%amount of calcium silicate mineralconditioner.4、The montmorillonite conditioner showed the best performance in the pot experiment. The smallrape plant height, dry weight, chlorophyl（lSPAD）, plant total nitrogen content and plant total potassium content was increased significantly by10.4%,23%,10%,7.1%and10.7%under2%amountconditioner respectively, the4%amount treatment was increased by11.7%,23.9%,11%,9.4%and11%respectively.