Urochloa decumbens e Stylosanthes capitata em cultivo simultâneo sob níveis de adubação nitrogenada e fosfatada e inoculadas com fungos micorrízicos arbusculares

Abstract

Efficient animal husbandry is linked to the production of high quality and low cost forage, an alternative to reduce commercial inputs or a potentialization of their use in livestock can be the intercropping between brachiaria and styling as a use of biological inputs. The objective of this study was to evaluate the effect of the inoculation of arbuscular mycorrhizal fungi (AMF) and nitrogen and phosphate fertilization levels without growth and nutrients in Urochloa decumbens and Stylosanthes capitata plants under a NEOSSOLO QUARTZARÊNICO (RQ) substrate. The study consisted of two experiments: i) U. decumbens and Stylosanthes capitata plants intercropping and inoculated with FMA under nitrogen levels and ii) U. decumbens and Stylosanthes capitata plants intercropped and inoculated with FMA under phosphorus levels. Both treatments were in a factorial (2x4) scheme, with four replications, with two treatments: FMA in natural substrate (inoculated with mixture of isolates and substrate without inoculation) and four levels of N (0, 75, 150 e 300 mg dm-3), without experiment I, as well as four levels of P (0, 120, 240 and 480 mg .dm-3) non-experiment II. At 60 days after sowing as plants were harvested and rivers were harvested: i) plant height, ii) leaf number, iii) leaf area, iv) N, P, K, Ca and Mg contents, v) density of glomerospores , vi) root mycorrhizal colonization rate and vii) number of nodules in roots of Stylosanthes capitata. An inoculation with the mix of FMA (Gigaspora margarita and Acaulospora mellea) favored growth and N and P contents in plants of Urochloa decumbens consortium with Stylosanthes capitata. An inoculation with the FMA mix (Gigaspora margarita and Acaulospora mellea) favored plant growth and P content in Stylosanthes capitata plants consortium with Urochloa decumbens under phosphate fertilization. Phosphate fertilization increased the growth and P content in Stylosanthes capitata plants intercropped with Urochloa decumbens. An inoculation with the mix of FMA (Gigaspora margarita and Acaulospora mellea) on RQ substrate favors the growth of plants and P plants in Stylosanthes capitata plants consortium with Urochloa decumbens under phosphate fertilization. An inoculation with the mix of FMA (Gigaspora margarita and Acaulospora mellea) on RQ substrate favors the growth and N and P contents in plants of Urochloa decumbens consortium with Stylosanthes capitata.