INTERACTIVE EFFECT OF SULFUR AND PHOSPHORUS ON NODULATION,NITROGEN FIXATION,AND NUTRIENT UPTAKE BY CHICKPEA GROWN ON CALCAREOUS SOILS IN PAKISTAN |
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| Authors: | Muhammad Islam Saleem Mohsan Safdar Ali |
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| Institution: | 1. National Fertilizer Development Centre , Islamabad , Pakistan;2. Department of Soil Science &3. SWC , PMAS - Arid Agriculture University , Rawalpindi , Pakistan |
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| Abstract: | Field experiments were conducted at two different locations under rainfed conditions of Punjab, Pakistan to assess nodulation, nitrogen fixation and nutrient uptake by chickpea (Cicer arietinum L.) in response to application of three rates 0, 40, and 80 kg phosphorus pentoxide (P2O5 ha?1)] of phosphorus and three rates (0, 15 and 30 kg S ha?1) of sulfur in different combinations. Effect of phosphorus application was nonsignificant while that of sulfur was significant on percent nitrogen derived from atmosphere. Both phosphorus and sulfur application resulted in increase in nitrogen fixation up to 38% and 33% over control, respectively. Nutrient uptake nitrogen (N), phosphorus (P), and sulfur (S)] increased significantly with the application of phosphorus and sulfur and correlated positively with nitrogen fixation. There is direct involvement of sulfur in the process of nitrogen fixation whereas effect of phosphorus on nitrogen fixation is indirect mainly through enhanced growth and dry matter production. |
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| Keywords: | natural abundance technique legumes nitrogen derived from atmosphere plant analysis |
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