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| Establishment of Recommended Potassium Fertilization Technical System for
Vegetables in South China |
| LI Shu-yi1，ZHANG Qiao2，LIAO Xin-rong1，WANG Rong-ping1，DING Xiao-dong1，ZHANG Yu-can2 |
1 Guangdong Institute of Eco-environmental and Soil Science， Guangzhou 510650， Guangdong， China； 2 Guangdong
General Agency for Soil and Fertilizer， Guangzhou 510500， Guangdong， China |
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Abstract Fertilizer K experiments of 138 field trials on leaf vegetable，gourd vegetable and
legume vegetable in different locations with different fertility levels were investigated，and the statistical
analysis on the relative yield and potassium fertilization and soil available potassium were carried out．
The regression equations were also established．They were to determine the soil Rich-Lack index on
available potassium and the recommended fertilization of potassium for different fertility levels of soil．
Results showed that when the relative yield of vegetable were <75%，75%-95%，>95%，the soil
Rich-Lack index on the available potassium were <50 mg·kg-1，50-240 mg·kg-1，>240 mg·kg-1，
respectively for gourd-vegetable like balsam pear，that was <45 mg·kg-1，45-195 mg·kg-1，>195
mg·kg-1 respectively for legume vegetable like cowpea，that was <20 mg·kg-1，20-140 mg·kg-1，
>140 mg·kg-1 respectively for leaf vegetable．The recommended fertilization of potassium for different
fertility levels of soil were that the gourd vegetables were 225.0 kg·hm-2，112.5-225.0 kg·hm-2，
<112.5 kg·hm-2 respectively，the legume vegetables were 187.5 kg·hm-2，105.0-187.5 kg·hm-2，<105.0 kg ·hm-2，respectively，the leaf vegetables were 142.5 kg·hm-2，82.5-142.5 kg·hm-2，
<82.5 kg·hm 2，respectively.
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Received: 30 May 2012
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