Potato-Cabbage Double Cropping Effect on Nitrate Leaching and Resource-Use Efficiencies in an Irrigated Area  

作　　者：HU Bo FAN Ming-Shou HAO Yun-Feng ZHANG Jian-Hua 

机构地区：[1]College of Agronomy,Inner Mongolia Agricultural University,Hohhot 010019(China) [2]Bayannur City Agriculture Science Institute,Bayannur 015500(China) [3]School of Life Sciences and State Key Laboratory of Agrobiotechnology,The Chinese University of Hong Kong,Hong Kong(China)

出　　处：《Pedosphere》2012年第6期842-847,共6页土壤圈（英文版）

基　　金：Supported by the Inner Mongolia Agricultural University Innovation Team Foundation for Potato,China (No.NDPYTD2010-5);the Ministry of Agriculture Special Industry Foundation of China (No. 201103003);the Hong Kong Research Grants Council of China (No. HKBU 262809)

摘　　要：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 NO^--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.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 NO 3 -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 NO 3 -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.

关 键 词：apparent nitrogen recovery nitrogen uptake soil resources solar energy yield 

分 类 号：S143.13[农业科学—肥料学] X24[农业科学—农业基础科学]