Meta-analysis of soil nitrate nitrogen and nitrogen leaching under conventional agricultural management in Hetao Irrigation District,Inner Mongolia
In order to controll nitrogen fertilizer amount,save water,and improve soil fertility,soil nitrate nitrogen and nitrogen leach-ing and their related factors were systematically explored using meta-analysis methods in terms of the data collected from the published results in the Hetao Irrigation District,Inner Mongolia.The results showed that the means of nitrate nitrogen at the 0～20 cm depth in the corn,sunflower,and spring wheat fields under conventional management were 22.78,9.92,and 17.80 mg/kg,the means of soil nitrogen leaching were 49.82,45.11,and 93.73 kg/(hm2·a),and the means of conventional nitrogen(N)application rate were 357.7,233.2,and 320.0 kg/hm2,respectively.The soil nitrogen leaching resulting from the conventional nitrogen application rate was 6.76 times that from the no nitrogen fertilizer application,and the main influencing factors were soil texture,soil surface organic mat-ter,soil surface pH,crop tape,and irrigation rate.These findings indicated that the nitrogen application rate under the conventional management in the Hetao Irrigation District was high,the soil fertility tended to decrease over time,and the nitrogen leaching was seri-ous.
万方数据
维普
