Title: Phosphorus removal and available P balance in a Typic Ustochrept under intensive cropping and long-term fertilizer use
Abstract: Removal of P by crops was studied for three years under long-term fertilizer experiment on wheat, cowpea and maize crops with ten fertilizer treatments since 1971 on a Typic Ustochrept of Delhi. Total P removal by wheat grain was significantly increased by the different fertilizer treatments. Superoptimal dose of NPK and the use of FYM or Zn or sulphur along with NPK did not show consistently higher P uptake by wheat grain. In cowpea (fodder) also the various fertilizer treatments caused higher P uptake. Although maize crop exhibited significant positive effect of different fertilizer treatments with respect to the total P uptake, higher NPK and NPK + FYM treatments proved to be more effective. The 50% NPK or NP or N alone caused quite low P uptake by maize stover. While a total of 70 kg P ha−1 was added annually through fertilizers under NPK treatment, there was a theoretical surplus of 38 kg P ha−1 and this P build up was more pronounced when higher NPK dose was applied. The soil test values also indicated build up of available P in P-receiving plots and a depletion in control and N-treated plots. The results suggested that the rates of phosphate application being adopted in these experiments are very high and may be lowered in case of long-term P use.
Publication Year: 1998
Publication Date: 1998-01-01
Language: en
Type: article
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Cited By Count: 9
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