Potential of Legumes Species Submitted to Phosphate Fertilization Levels: Morphological, Productive and Chemical Characteristics

Abstract

ABSTRACT The objective was to evaluate the morphological, productive and chemical characteristics of Crotalarias juncea, spectabilis and ochroleuca, and pigeon pea (Cajanus cajan) submitted to phosphate fertilization levels. The experimental design used was completely randomized in a 4 × 4 factorial scheme, with four doses of phosphorus (0, 100, 200, 300 kg ha−1 of P2O5) and four legume cultivars (Crotalaria juncea, Crotalaria spectabilis, Crotalaria ochroleucaanda and Cajanus cajan), with four repetitions. There was no interaction between the levels of phosphate fertilizer and the legume species for the productive characteristics studied. There was a positive linear effect for leaf dry matter production, stem dry matter production and total dry matter production as a function of phosphate fertilization. There was a positive linear effect for the levels of leaf crude protein, with enhanced levels of phosphorus. There was greater fertilizer efficiency in legumes, at a dose of 100 kg ha−1, with a response of 11.46 kg ha−1 for leaf dry matter production and 33.40 kg ha−1 for total dry matter production. Among legumes, Crotalaria spectabilis is recommended due to the higher total dry matter and leaf productivity, greater number of nodules, and better chemical composition and digestibility.