| Effects of partial root\|zone irrigation and fertilization on spatial distribution of available nitrogen in soil |
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| DOI：10.7606/j.issn.1000-7601.2020.06.16 |
| Key Words: partial root\|zone irrigation fertigation hole\|applying urea available nitrogen transport transformation |
| Author Name | Affiliation | | HAN Guojun | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Nianlai | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHU Run | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SUN Xiaomei | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | REN Jianxin | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Li | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to study the effects of irrigation and fertilization in root zone on the transformation of soil nitrogen (N), two fertilization methods including hole applying urea and fertigation were used with fertilization rates of 240 kg·hm-2 and 180 kg·hm-2. During the experimental time, two irrigation methods including full irrigation and partial root zone irrigation were tested separately, with irrigation amounts of 14 L and 7 L. The NH+4-N, NO-3-N, and alkaline N contents in soil were investigated, and the spatial distribution characteristics of different forms of N after fertilization and irrigation were analyzed. The results showed that the NH+4-N content in soil was more easily distributed in the soil, while the NO-3-N content in soil was more likely to migrate horizontally. In terms of spatial distribution, the variation of soil N content was: NO-3-N > NH+4-N > alkaline N. The spatial variation of soil NO-3-N content was 32%~40%, that of NH+4-N content was 26%~37%, and that of alkaline N content was 6%~12%. The spatial variation of NO-3-N content in partial root\|zone irrigated soil was 16%~20% less than that in full irrigated soil. The spatial variation of NH+4-N content in urea hole\|application soil was 12%~28% less than that in drip\|fertilized soil. Therefore, N conversion rate in soil can be regulated to maintain the effect of nutrient stability release. The optimal method of fertilization and irrigation was the combination of hole\|applying urea and partial root\|zone irrigation, which improved the soil N supply capacity in this experiment. |
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