Phosphorus Use Efficiency in Upland Rice Genotypes Under Field Conditions

Fageria, N.K. and de Morais, O.P. and dos Santos, A.B. and Vasconcelos, M.J. (2013) Phosphorus Use Efficiency in Upland Rice Genotypes Under Field Conditions. Journal of Plant Nutrition. pp. 1-18.

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Phosphorus (P) deficiency is one of the most yield limiting factors for crop production in South American soils. Upland rice (Oryza sativa L.) is an important crop in South American cropping systems, including Brazil. A field experiment was conducted with the objective to evaluate 20 upland rice genotypes for phosphorus (P) use efficiency. The P rate used was low (0 kg P ha−1) and high [87 kg P ha−1 or 200 kg phosphorus pentoxide (P2O5) ha−1]. Plant height, shoot dry weight, grain yield, panicle number, 1000 grain weight, spikelet sterility, and grain harvest index were significantly influenced by P and genotype treatments. The P X genotype interaction was significant for grain yield, indicating that genotypes responded differently under two P rates. Overall, grain yield increased by 12% with the addition of P fertilization. Based on grain yield efficiency index, genotypes were classified into efficient, moderately efficient, and inefficient group. The genotypes that were classified as efficient in P use were BRA032048, BRA042094, BRA02601, BRA032051, BRA032033, BRA052015, BRA042156, BRA01600, BRA01506, BRA052023 and BRA042160. The inefficient genotypes in P us efficiency were BRS Primavera, BRA052045, BRA01596, and BRS Sertaneja. Grain harvest index had a significant positive association with grain yield and spikelet sterility had a significant negative association with grain yield, as expected. Average, P-use efficiency of five genotypes was about 17 kg kg−1 (kg grain yield per kg P applied).

Item Type: Article
Uncontrolled Keywords: Grain yield, grain harvest index, Oxisol, Oryza sativa L
Author Affiliation: National Rice and Bean Research Center of EMBRAPA , Caixa Postal 179, CEP. 75375-000, Santo Antônio de Goiás , GO , Brazil
Subjects: Plant Production
Divisions: Other Crops
Depositing User: Mr Siva Shankar
Date Deposited: 10 Jan 2014 10:09
Last Modified: 10 Jan 2014 10:09
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