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2 , ABSTRACT: Phosphorus, besides its adsorption, is deficient in the soils of the Brazilian semiarid region, which makes the use of fertilizer at appropriate levels a necessary practice to maintain and/or increase agricultural production, particularly of forages, taking full advantage of rainwater regarding conservation through the appropriate use of land under the high temperatures in this region. An experiment was conducted in Chromic Luvisol in the state of Pernambuco in order to evaluate the production factors of three cultivars of sorghum (IPA 4-6-7/42, IPA 2-3-1 and IPA SF-25), in rainfed systems, through the application of phosphorus at rates of 0, 40 , 80, 120 and 160 kg ha -1 P 2 O 5 in the form of triple superphosphate. We used statistical design of randomized blocks in (3 × 5) factorial with four replications. The effects of P rates were independent of the crops. The cultivar IPA 4-6-7/42 showed better performance than the other two cultivars studied in all parameters.

Níveis de fósforo via adubação em três variedades de sorgo forrageiro: Características agronômicas