Study On Dynamic Characteristics Of Ammonia Volatilization In SSP Impact Of Nitrogenous Fertilizer

Ammonia volatilization is a important way of nitrogenous fertilizer loss.It is not only can reduce the use efficiency of nitrogenous fertilizer and increase the production cost,but also can lend to nitrogen deposition, acid rain,soil acidification,vegetation subrogation,forest decline,water eutrophication and other severe ecological problems.So study on the ammonia volatilization of nitrogen fertilizer is value to increase the use efficiency of nitrogenous fertilizer,reduce nitrogenous fertilizer loss and production cost,guide agricultural production,protect environment and so on.This article uses the closed room method and by controlling the phosphorus application amount and temperature to study the relationship between them and nitrogen fertilizer.Moreover,base on the results get the dynamic equation.Main results were as follows:SSP was applicated to soil can lend to the pH value of soil change.When phosphorus fertilizer application amount increased,the pH value reduced.The pH of no application was 5.89,but if the amount of phosphorus fertilizer application was 100kg/hm~2,the soil pH was low to 4.74.And it also lent to the peak time of ammonia volatilization of urea changed.At every temperature,the peak time was NP0＜NP25＜NP50＜NP75＜NP100,the meaning was the peak time of ammonia volatilization had relationship with phosphorus fertilizer application amount.Phosphorus fertilizer application amount was more big,the peak time of ammonia volatilization was more late.In addition,when the phosphorus fertilizer application amount was different,the peak of ammonia volatilization was also different,which was NP0＞NP25＞NP50＞NP75＞NP100.The meaning was that with the phosphorus fertilizer application amount being increased,the peak value of ammonia volatilization was deduced.And phosphorus fertilizer application amount impacted the accumulated ammonia volatilization amount of urea,too.The accumulated ammonia volatilization amount was reduced when phosphorus fertilizer application amount was increased.When ammonium bicarbonate was used,ammonia volatilization was reduced with time.When urea and phosphorus fertilizer was used at the same time,the phosphorus fertilizer application amount and temperature was same,the loss rate of accumulated ammonia volatilization of urea was higher than the rate of ammonium bicarbonate.Temperature had effect on the ammonia volatilization of urea.When phosphorus fertilize was no used,the ammonia volatilization amount of urea was increased with temperature rose.However,was changed with temperature when phosphorus fertilizer was applied.The ammonia volatilization amount was larger in 30℃than in 35℃.This phenomenon may be because of the compound effect between temperature and fertilizer. Temperature had effect on the ammonia volatilization of ammonium bicarbonate,too.At every level of phosphorus fertilizer application amount,the ammonia volatilization amount of ammonium bicarbonate was increased when temperature was risen.Under the condition of urea and phosphorus fertilizer was used at the same time,we could utilize mathematical model "Y=a+bt+c/t" to expressed the relationship between ammonia volatilization amount of urea and time.And the relationship of accumulated ammonia volatilization amount of ammonium bicarbonate and time could use Elovich dynamic equation "Y=a+blnt" analysis.