Nutrição da palma forrageira em resposta a adubação nitrogenada e potássica

Abstract

The research was carried out at the experimental station of the Instituto Nacional do Semiarid, Campina Grande – PB, aiming to evaluate the effects of nitrogen and potassium fertilizers doses on the production and mineral composition of the Forage Palm Opunti Stricta Haw. The combination of five doses of nitrogen (7.8; 46.8; 78; 109 and 148 kg ha -1 ), and five doses of potassium (30; 180; 300; 420 and 570 kg ha -1 ) was studied. Using urea and potassium chloride (KCL) as sources, respectively, plus three additional treatments (148kg ha -1 of N + 30 kg ha -1 of K2O; 7.8 kg ha -1 of N + 570 kg há-1 of K2O; and a control without fertilization). Phosphorus was applied in a single dose to all plots, of 100 kg of P2O5 ha - 1 , in the form of triple superphosphate. The treatments were divided into plots with and without limestone. The production of fresh matter and dry matter was influenced by nitrogen and potassium doses. The application of limestone provided an increase in the production of fresh palm mater by 12,55%. Nitrogen, phosphorus and potassium contents were influenced by fertilizer doses.