Efeito de fontes e doses de nitrogênio sobre o crescimento inicial e qualidade de mudas de jacarandá-da-bahia (Dalbergia nigra (Vell.) Fr. All. ex Benth.)

摘要

The objective of this work was to evaluate the effect of sources and doses of nitrogen on the initial growth and quality of jacarandá-da-Bahia (Dalbergia nigra (Vell.) Fr. All. ex Benth.) seedlings produced in three types of soils (RED YELLOW ARGISOL, CAMBISOL and RED YELLOW LATOSOL). The nitrogen sources were: ammonium nitrate, calcium nitrate and ammonium sulfate, in five doses (0, 50, 100, 150 and 200 mg/dm3 of N) equally parceled out and applied on the 25 th, 50 th, 75 th and 100 days after sowing. The experiment was arranged in a complete randomized blocks, in (3 x 5 x 3) factorial design, with four repetitions. At 125 days after sowing, the best quality standard was found in seedlings produced in the RED YELLOW ARGISOL, having ammonium sulfate as nitrogen source, with the dose of 180 mg/dm3 of N.