Vol. 10, Issue 12 (2021)

Author(s):
Sajan Singh, Vinay Samadhiya, Mohhammad Shahid, Ipsita Pattanaik, Biplab Choudhari, Chandrabhooshan Singh, Rakesh Paul, Nainsi Naya, Deepika Sahu and Himanshi Verma

Abstract:
Phosphorus being an immobile nutrient element in soil its availability to plants is less despite the total P in soils being in the range 200–3000mg P kg/ha. Further in elevated CO₂ concentration, the soil P concentration is influenced. The present investigation entitled “Effect of Elevated Carbon Dioxide Concentration on Phosphorus fractionation and Phosphorus use efficiency in low land transplanted Rice crop” was conducted in the institute research farm of ICAR-NRRI Cuttack (Odisha) during the Kharif season of 2016. The total experiment was laid out inside open top chambers (OTC) in the field. The chambers were laid in the field with a common room for controlling the amount of CO₂ to be supplied to various OTCs. Inside the OTC the crop were transplanted inside six pots containing various doses of phosphorus. It was seen that phosphorus sorption decreased and desorption increases with increase in CO₂ concentration with minimum and maximum values respectively under treatment T9 (C3P2). The various agronomical parameters including plant height, tiller numbers, biomass, and yield also shows significant results with increased CO₂ concentration. Plant height and tiller numbers were found to be maximum under treatment T9 (C3P2) and so do the yield also increased with increased CO₂ concentration with maximum yield under treatment T9 (C3P2).Available phosphorus and different soil physiochemical parameters and soil phosphorus fraction was analyzed. Available phosphorus was highly correlated with organic carbon followed by AHC, Followed by POSC, followed by alkaline and acid phosphates and organic phosphorus respectively. It can be observed that PUE is increasing with increase in carbon dioxide concentration. This directs the effect of elevated atmospheric CO₂ is typically increases in above-ground and below ground productivity of C3 and sometimes C4 plants. Plant physiological processes like C metabolism, water-use efficiency (WUE) and nutrient-use-efficiency (NUE) are enhanced with elevated CO₂.