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Characterization of Soil Available Nitrogen in the Major Vegetable Production Areas of Pearl River Delta,China 总被引:2,自引:0,他引:2
CHEN Qiong-xian ZHANG Bai-ge CAO Jian HE Xin-zhou FAN Mei-hong GAO Hui-nan YAGN Qiu LI Qiang CHEN Han-cai CHEN Qiong-xian ZHANG Bai-ge CAO Jian HE Xin-zhou FAN Mei-hong GAO Hui-nan YAGN Qiu LI Qiang CHEN Han-cai 《农业科学与技术》2010,11(7):99-102
A macro scale survey was performed to investigate the content of soil available nitrogen (N) and its spatial distribution in the main vegetable production areas of the Pearl River Delta.Preliminary enrichment-deficient index of available N was then developed,which was a base for increasing fertilizer application efficiency and vegetable yield as well as for constructing soil testing and fertilizing formula.In general,most of the vegetable growth areas in Pearl River Delta were N-deficient or medium-N-deficient.There was 30%-62% increase in yield of Chinese cabbage on the N-deficient soil after application of N; when soil available N content was less than 145 mg/kg,the yield increased with application of N fertilizer at a rate of 60-70 kg/hm^2. 相似文献
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