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Journal of Agronomy
Year: 2002  |  Volume: 1  |  Issue: 1  |  Page No.: 49 - 50

Phosphorus Use Efficiency of Soybean as Affected by Phosphorus Application and Inoculation

Khair Mohammad Kakar, Muhammad Tariq, Fazal Hayat Taj and Khalid Nawab    

Abstract: To study the effect of inoculation and phosphorus application on soybean nutrition, an experiment was conducted at two locations in the North West Frontier Province (NWFP) of Pakistan. Four levels of P viz., 0, 40, 60, and 80 kg ha-1 of P2O5, and two levels of inoculation, no inoculation and inoculation with Bradyrhizobium japonicum were studied. Data were recorded on biological yield, seed yield, and P concentration in biological yield, and P uptake efficiency (PUPE), P utilization efficiency (PUTE), P use efficiency (PUE), fertilizer P uptake efficiency (FPUPE), fertilizer P utilization efficiency (FPUTE), fertilizer P use efficiency (FPUE) were calculated. Phosphosrus application slightly increased PUPE but decreased PUTE and PUE. Increase in P application increased FPUPE, FPUTE and FPUE. Inoculation increased PUPE, PUE and FPUPE at both locations but increased PUTE, FPUTE and FPUE at NWFP-AU only. Due to increase in yield and improvement in nutritive quality of the soybean seed and shoot, inoculation and P application is necessary for higher protein and oil yields from soybean seeds as well as for higher forage protein yields from soybean planted for forage.

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