RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (10): 1611-1617.doi: 10.11870/cjlyzyyhj201610016

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EFFECT OF SITE-SPECIFIC FERTILIZATION ON THE STATUS OF SOIL POTASSIUM IN PURPLE VEGETABLE SOIL

GU Shou-kuan1, QIN Yu-sheng2, SUN Qian-qian1, WANG Zheng-yin1, TU Shi-hua2   

  1. 1. College of Resources and Environment, Southwest University, Chongqing 400716, China;
    2. Soil and Fertilizer Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China
  • Received:2016-01-21 Revised:2016-03-04 Online:2016-10-20
  • Supported by:
    Special Fund for Agro-scientific Research in the Public Interest(201203013);International Plant Nutrition(IPNI) Program(Chongqin200808)

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Abstract: A three-year (12 seasons) field experiment was conducted on a purple vegetable soil under a lettuce-cabbage rotation to investigate the effects of site-specific fertilization on forms and supply capacity of soil potassium. Field experiment and chemical analyses were used to determinate the change of soil potassium form and its relation with vegetable yields. The results showed that the main forms of potassium in the purple vegetable soil was structural potassium which accounted for 95.11%~97.33% of the total potassium, slow-release potassium and available potassium accounted for 2.22%~3.38% and 0.44%~1.52% of the total potassium, respectively. Long-term application of potash significantly improved the contents of soil available potassium and slow-release potassium, the addition of potassium fertilizers achieved the highest increasing rate. Located fertilization significantly improved the contents of water soluble potassium, non-specifically absorbed potassium and specifically absorbed potassium, and the increasing rate in organic fertilizers treatments was better than in only inorganic fertilizer treatments. Water soluble K and non-exchangeable K had positive significant correlations with available P. Available K and slowly available K also had the positive significant correlations with lettuce and cabbage yields. Site-specific fertilization coordinated potassium forms of purple vegetable soil improved the supply capacity of soil potassium and the best was in combined application of organic and inorganic fertilizers.

Key words: site-specific fertilization, purple vegetable soil, potassium forms

CLC Number: 

  • 158.5
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