Effect of N fertilization on the mineral nitrogen in soil in wind-water erosion crisscross region on the Loess Plateau | 施氮对黄土高原水蚀风蚀交错区土壤矿质氮的影响
2009
Tao Wuhui, Northernwest Agriculture and Forestry University, Yangling (China), Institute of Soil and Water Conservation | Shen Yufang, Northernwest Agriculture and Forestry University, Yangling (China), Institute of Soil and Water Conservation | Li Shiqing, Northernwest Agriculture and Forestry University, Yangling (China), Institute of Soil and Water Conservation
Field trials were carried out to study the effect of fertilizer on the content and accumulation of mineral nitrogen in soil in wind-water erosion crisscross region on the loess plateau. Two factors, crop plant and N fertilizer, were selected for, under different N fertilizer and crop, analyzing mineral nitrogen in 0C100 cm soil layer in wind-water erosion crisscross region on the loess plateau. The content and accumulation of the mineral nitrogen varied with layer and fertilization treatments. And the same to NO－3-N, but NH+4-N had no significant change. The content and accumulation of the mineral nitrogen was the highest in 0C20 cm layer under different fertilization treatments, and the content and accumulation of NO－3-N in different layers had a similar variation as it improved with the increase of nitrogen level. Different fertilization treatments affected insignificantly the content of NO－3-N and mineral nitrogen in soil except the content of NO－3-N in 0C20 cm layer in the 90 kg/hm2 P + 45 kg/hm2 N treatment. In the same fertilization treatments, the content of mineral nitrogen in alfalfa soil and ryegrass soil had no significant change. The content and accumulation of the mineral nitrogen varied with layer and fertilization treatments. There was a close relation between the content and accumulation of the mineral nitrogen in soil and N fertilizer.
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