Pedosphere 22(6): 842--847, 2012
ISSN 1002-0160/CN 32-1315/P
©2012 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Potato-cabbage double cropping effect on nitrate leaching and resource-use efficiencies in an irrigated area |
HU Bo1, FAN Ming-Shou1 , HAO Yun-Feng2 and ZHANG Jian-Hua3 |
1 College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010019 (China);
2 Bayannur City Agriculture Science Institute, Bayannur 015400 (China);
3 School of Life Sciences and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong (China) |
| ABSTRACT |
| To reduce the nitrate leaching risk after potato (Solanum tuberosum L.) harvest and improve nitrogen fertilizer-use efficiency, a potato-cabbage double cropping system (DCS) was established at Hetao, North China, an arid area with irrigated land. A two-year field experiment demonstrated that planting early-maturing potato cultivar under plastic mulch shortened its growth period by 14 d and allowed a second crop of cabbage to scavenge the soil residual NO3--N to a depth of 160 cm, substantially reducing the risk of nitrate leaching into groundwater. The yearly total N uptake in DCS was about 110 kg ha-1 more than that in the conventional cropping system (CCS), i.e., mono potato planting. This accounted for apparent nitrogen recovery (ANR) improvement of 16.90%-26.57% in the DCS as compared to that in the CCS for both years. As a result, the soil residual NO3--N in the 0-160 cm soil profile in the DCS was lower than that in the CCS. The solar energy-use efficiency and soil-use efficiency were also substantially increased with DCS. |
| Key Words: apparent nitrogen recovery, nitrogen uptake, soil resources, solar energy, yield |
| Citation: Hu, B., Fan, M. S., Hao, Y. F. and Zhang, J. H. 2012. Potato-cabbage double cropping effect on nitrate leaching and resource-use efficiencies in an irrigated area. Pedosphere. 22(6): 842-847. |
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