Phosphorus uptake and phosphorus use efficiency of high zinc rice genotypes of clay soil under different levels of fertility

Abstract

Phosphorus (P) is necessary by crop plants for many physiological and biochemical functions. Consciousness of phosphorus uptake and its use by crop plants is essential for management of this essential nutrient. A field experiment was conducted during Kharif season, 2013 at the Research cum Instructional Farm, Indira Gandhi Krishi Vishwavidhyalaya, Raipur (C.G), to determine P uptake and use efficiency of high zinc containing rice genotypes in lowland clay soil order belongs to the Vertisols. Plant samples were collected at maturity stage. Rice (Oryza sativa L.) is one of the most important staple food crops for approximately half of the global world. The experiment was carried out in split-plot design with three replications having four fertility levels in main plots and twelve varieties in sub plots. The highest total phosphorus uptake was recorded by R-1033-968-1(ABL) (G2), followed by the genotype R-RF-31(ABL) (G1) that was statistically at par with Chandrahasini (G12) and significantly the lowest phosphorus uptake was obtained by SWARNA×MOROBRAKEN-23 (G3). Phosphorus uptake increased with increasing fertilizer application from low to high fertility level. Application of high fertility level produced higher phosphorus uptake (18.645kg ha-1) followed by medium fertility level (17.249kg ha-1) low in lower fertility level (15.110kg ha-1) and lowest (11.081 ha-1) in control. Phosphorus use efficiency ranged from 17.80 to 36.70 90 per cent with overall mean value of 27.00 per cent. The genotype R-1033-968-1(ABL) was recorded maximum PUE and the lowest by Improve Chitimutalya. The doses of phosphorus application affected P use efficiency. It was higher in case of low fertility level than that of medium and high fertility level.