| Effect of basal application of urea on the growth of millet and spatial-temporal distribution of nitrate nitrogen |
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| DOI：10.7606/j.issn.1000-7601.2012.05.24 |
| Key Words: Urea gneiss nitrate leaching millet |
| Author Name | Affiliation | | LI Xiangwen | College of Resources and Environmental Sciences, Agricultural University of Hebei, Baoding, Hebei 071001, China
Mountainous Areas Research Institute, Hebei Agricultural University
National Engineering Research Center for Agriculture in Northern Mountainous Areas, Baoding, Hebei 071001, China | | WANG Hong | Mountainous Areas Research Institute, Hebei Agricultural University
National Engineering Research Center for Agriculture in Northern Mountainous Areas, Baoding, Hebei 071001, China | | ZHANG Aijun | Mountainous Areas Research Institute, Hebei Agricultural University
National Engineering Research Center for Agriculture in Northern Mountainous Areas, Baoding, Hebei 071001, China | | ZHANG Ruifang | Mountainous Areas Research Institute, Hebei Agricultural University
National Engineering Research Center for Agriculture in Northern Mountainous Areas, Baoding, Hebei 071001, China | | ZHOU Damai | Mountainous Areas Research Institute, Hebei Agricultural University
National Engineering Research Center for Agriculture in Northern Mountainous Areas, Baoding, Hebei 071001, China |
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| Abstract: |
| A field experiment was conducted in the gneiss Entisols to study the effect of different application of urea on the growth of millet and spatial-temporal distribution of nitrate nitrogen. A field micro-plot of 10 m2 experiment with four levels of nitrogen fertilizer treatments: 0(CK), 120 kg/hm2(N120), 225 kg/hm2(N225), 300 kg/hm2(N300), was conducted. The results on a 2-year-term location experiment showed that under this experiment condition, the yield of N120 treatment reached the highest of 4.76 kg/10m2, while the high rates of N application from N225 to N300 did not significantly increase millet yield. Based on the difference of nitrate nitrogen distribution in 0～60 cm soil profile, the content of NO3--N increased significantly by N120, N225 and N300 fertilizer treatment in 0～40 cm layer, especially the NO3--N of N225 and N300 was moved down to 40～60 cm layer after fertilization for 20 days. The NO3--N had exceeded below 60 cm layer in each fertilizer treatment after fertilization for 80 days. The NO3--N content by N120, N225 and N300 increased more significantly than CK after fertilization for 96 days (millet harvest), and the accumulation of NO3--N in soil increased with the increase of fertilizer. |
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