Spatio-temporal variability of available N,P and K in Ochric Aquic Cambosols in North China Plain
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DOI:10.7606/j.issn.1000-7601.2005.04.07
Key Words: Ochric Aquic Cambosols  available nutrient  spatio-temporal variability
Author NameAffiliation
ZHU An-ning Institute of Soil ScienceChinese Academy of SciencesNanjing 210008ChinaCollege of Water Resources and EnvironmentHohai UniversityNanjing 210008China 
ZHANG Jia-bao Institute of Soil ScienceChinese Academy of SciencesNanjing 210008ChinaCollege of Water Resources and EnvironmentHohai UniversityNanjing 210008China 
LI Li-ping Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China 
FENG Jie Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China 
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Abstract:
      A 2-year field experiment was conducted in North China Plain to determine the spatio-temporal variability of available N, P and K in ochric aquic cambosols,and to evaluate the effect of available nutrients on crop yield. The results showed that the content of hydrolyzable N tended to increase, the content of available K was relatively high but tended to decrease gradually with time, and the level of available P was very low and showed a high spatial variation. It was suggested that site-specific fertilizer management rather than traditional fertilization be adopted so as to improve the spatio-temporal variability of soil available nutrients.