Abstract:

In order to know China's agricultural non-point source pollution in the soil of the residual migration into law and special, as field trials in Qianguo Irrigation Area, and through the 10 groups of testing processing and district field experiment, extracted water samples at different depths, doing water quality observation and data processing, mainly ammonium, nitrate and phosphate in the soil profile to start on the migration and transformation of analysis. The results showed that, there was a peak which the experimental plot of ammonia concentration in surface water for some time after fertilization, and then appeared attenuation trend. The greater the amount of irrigation and fertilization in the greater volume of cases, the greater the amount of nitrogen with the downward migration of water, (in the irrigation water NI treatment than dealing with many SI 2.2 kg/hm2, fertilizer treatment processing more than SF NF 1.5 kg/hm2). In the case of fertilizer evenly, the water down the nitrogen migration ammonium was smaller (which F1 deal with less than F2 deal with 0.7 kg/hm2). The test area of surface water and ammonium nitrate nitrogen concentration had nitrogen similar change trend, the greater the irrigation water and fertilizer in the greater the fertilizer and condition of uneven, the bigger into the groundwater nitrate nitrogen (irrigation water which NI treatment more than SI 1.12 kg/hm2, fertilizer treatment processing more than SF NF 0.55 kg/hm2, fertilizing, F1 processing proportion than F2 dealing with many 0.4 kg/hm2), so as to the groundwater. The test area of surface water in the first fertilization phosphate concentration (e-jing-za no.3) presented a huge spike, then fell back quickly and stable in a smaller level (no more than 2.5 mg/L).