Chinese Journal of Eco-Agriculture.
2014(12)
Page:1397-1404Core
Effects of nitrogen application and intercropping on spatio-temporal distribution of soil inorganic nitrogen in pea/maize intercropping fieldChinese Full Text
WU Kesheng;SONG Shangyou;LI Long;SUN Jianhao;BAO Xingguo;LI Weiqi;College of Agronomy, Gansu Agricultural University;Wuwei Extend Center of Agricultural Technology;Institute of Soil and Fertilizers, Gansu Academy of Agricultural Sciences;Institute of Dryland Agriculture, Gansu Academy of Agricultural Science;Key Laboratory of Plant and Soil Interactions, Ministry of Education/College of Resources and Environmental Sciences,China Agricultural University;
Abstract：The aim of this study was to determine nitrogen use efficiency and reduce environmental pollution caused by excessive use of nitrogen fertilizer in pea/maize intercropping fields in irrigated areas of Hexi Corridor, Gansu Province. To that end, a field experiment was conducted in 2011 to determine the spatial and temporal distributions of soil inorganic N（Nmin） in orthic anthrosol soils under pea/maize intercropping at different N application rates（N 0 kg·hm-2, 75 kg·hm-2, 150 kg·hm-2, 300 kg·hm-2, 450 kg·hm-2）.Soil samples were collected in the 0-20, 20-40, 40-60, 60-80, 80-100 and100-120 cm soil layers and Nminconcentrations measured by flow analysis of extracted Ca Cl2. The results showed that NO3--N was the major form of Nmin in orthic anthrosol soils with a concentration 7.55 times that of NH4+-N. During maize growth season, NO3--N concentration increased by 29.7%, 67.5%, 88.2% and134.3% respectively under N rates of 75, 150, 300 and 450 kg·hm-2over no N fertilization treatment. Compared with that after pea harvest, NO3--N concentration decreased by 44.2% after maize harvest. Soil NO3--N concentration in the 0-120 cm soil layer under intercropped pea/maize decreased respectively by 6.1%/5.1% over that of each corresponding monocultured crop. The highest soil Nmin accumulation occurred in the 0-20 cm soil layer at different nitrogen application rates and growth stages. After pea harvest, Nmin accumulation in the 0-60 cm soil layer under intercropped pea/maize respectively decreased by 4.9%/1.9%, and in the 60 -120 cm soil layer by 10.8%/9.2% compared with that of each corresponding monocultured crop. After maize harvest, soil Nmin accumulation in the 0-60 and 60-120 cm soil layers under intercropped pea/maize decreased respectively by 28.2%/9.4% and 23.5%/12.5% over each corresponding monocultured crop. Also soil Nmin residue in the 0-60 and 60-120 cm layers under intercropped pea decreased respectively by 4.9% and 10.9% over monocultured pea. The study showed that nitrogen fertilizer application significantly increased soil inorganic nitrogen concentration and accumulation with higher effect on soil NO3--N. Also excessive N application resulted in environmental pollution in the study area. Pea/maize intercropping significantly reduced soil inorganic nitrogen concentration and accumulation. It was obvious that intercropping reduced soil inorganic nitrogen accumulation especially in the later growth stages of the crops.
Keywords：
Nitrogen fertilizer application; Pea/maize intercropping; Soil inorganic nitrogen; NO3--N; Residual amount; Accumulation;
- DOI：
10.13930/j.cnki.cjea.140869
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture; Agronomy
- Classification Code：
S153.6
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