Changes in soil phosphorus fractions in a calcareous paddy soil under intensive rice cropping

@article{Zhang2006ChangesIS,
  title={Changes in soil phosphorus fractions in a calcareous paddy soil under intensive rice cropping},
  author={Qichun Zhang and G. H. Wang and Ying Feng and Qiang Sun and Christian Witt and Achim R. Dobermann},
  journal={Plant and Soil},
  year={2006},
  volume={288},
  pages={141-154}
}
We conducted a 4-year field experiment on a calcareous paddy soil in Zhejiang province of China to measure the changes in chemically extracted soil P fractions in an irrigated double-cropping rice system. Treatments included four fertilizer combinations (unfertilized control, NK, NP, and NPK) as main-plots and two rice cultivar types (inbred vs. hybrid rice) as sub-plots. Total plant P uptake and grain yield of rice declined in all treatments over time. Severe P-deficiency and significant rice… CONTINUE READING
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