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| Effects of Potash Fertilizer on Yields, Contents of Heavy Metal and Nitrate in Chinese Cabbage and Lettuce |
| WANG Xiao-jing1, WANG Zheng-yin1*, ZHAO Huan1, LIU Fang1, CHEN Yan-xia1, XIANG Hua-hui2, LI Rong2 |
| １College of Resources and Environmental Science, Southwest University, Chongqing 400716, China; ２Agricultural Bureau of Jiulongpo District in Chongqing, Chongqing 400700, China |
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Abstract Field experiments were carried out to study the effects of two kinds potash fertilizer with different dosages on yield, contents of heavy metal and nitrate in Chinese cabbage（Brassica campestris L. spp. pekinensis）and lettuce（Lactuca sativa L.）under acidic soil cultivation. Results indicated that two kinds potash fertilizers could significantly increase the yields of Chinese cabbage and lettuce, which reach 9.0 %-20.0 % and 8.7 %-52.0 %. And the maximum yield was at the high potassium level（450 kg?hm-2）for Chinese cabbage and lettuce. Combination of medium potassium sulfate and peat（K2S+M）could markedly increase yields of two vegetables as compared with potassium sulfate which reach 14.6 % and 12.1 %. Potash fertilizers could significantly decrease nitrate content of Chinese cabbage as well improve the content of lettuce. Potash fertilizers could greatly decrease arsenic and lead content of Chinese cabbage as well chromium and lead of lettuce. The effects of potash fertilizers on other heavy metals in two vegetables were discrepancy. Combination of potassium sulfate and peat could significantly decrease the heavy metals content（except mercury in Chinese cabbage and cadmium in lettuce）in two vegetables and improve their food safety.
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Received: 04 January 2011
Published: 11 April 2011
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