Phosphorus Produced With Different Processing Technology

Phosphorus is one of the three nutrient elements necessary to crop plant development and growth normally. Generally speaking, Phosphorus mobility in soil and its use eificiency are lower than that of the other two necessary elements such as nitrogen and potassium. How to improve the phosphorus use efficiency is the main research project in past time and mostly focused on applying methods improvement. In this research, two kinds of phosphate fertilizer were employed, one is ammonium phosphate which is produced by humidity processing technology, another is trickle irrigation specific fertilizer which is produced by heat processing technology. Mobility and distribution of phosphorus in soil originated from the two fertilizers and their cotton plant use efficiency were studied by using Isotope ³²P tracing and autoradiographic technique and field difference displaying method. The results showed that both of the distribution area and mobility of phosphorus from the trickle irrigation specific fertilizer are significantly lager than that of ammonium phosphate. Isotope ³²P tracing showed that the maximum vertical distance of phosphorus from the trickle irrigation specific fertilizer in soil reached 7.5cm, and ammonium phosphate is 6.2cm and the distribution area increased 19.1% over that of the later. Field difference displaying method showed that the phosphorus contents of the trickle irrigation specific fertilizer in the soil were higher than that of ammonium phosphate wherever near dripping pipe area or sowing line along area. The horizontal and vertical mobile distance of phosphorus originated from the trickle irrigation specific fertilizer longer than that of ammonium phosphate. Isotope ³²P tracing showed that cotton plant phosphorus use efficiency of the trickle irrigation specific fertilizer reached 21.05%, which increased 4.17% over that of ammonium phosphate (16.88%). Field difference displaying method showed that phosphorus use efficiency of the trickle irrigation specific fertilizer reached 24.95%, which increased 2.86% over that of ammonium phosphate (22.09%). A primary conclusion could be made is that phosphorus mobility and distribution in soil and cotton plant phosphorus use efficiency is affected by phosphate processing technology.