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
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.
王小晶,王正银,赵欢,刘芳,陈燕霞,向华辉,李戎. 钾肥对大白菜和莴苣产量、重金属和硝酸盐含量的影响[J]. 中国蔬菜, 2011, 1(10): 64-68.
WANG Xiao-jing1, WANG Zheng-yin1*, ZHAO Huan1, LIU Fang1, CHEN Yan-xia1, XIANG Hua-hui2, LI Rong2. Effects of Potash Fertilizer on Yields, Contents of Heavy Metal and Nitrate in Chinese Cabbage and Lettuce. , 2011, 1(10): 64-68.
