GROWTH AND QUALITY OF SEEDLINGS OF VINH\uc1TICO ( Platymenia foliolosa Benth.) IN RESPONSE TO THE MANURING WITH POTASSIUM AND SULFUR

O objetivo deste trabalho foi avaliar o efeito de doses de pot\ue1ssio e enxofre sobre o crescimento e a qualidade de mudas de Platymenia foliolosa Benth. (vinh\ue1tico), determinando a melhor dose desses nutrientes. Foi conduzido um experimento utilizando-se vasos de polietileno r\uedgido com 1,5 dm3 de capacidade e como substrato um Latossolo Vermelho-Amarelo. Utilizou-se como tratamentos sete doses de pot\ue1ssio (0; 50; 100; 150; 200; 250 e 300 mg/dm3) combinadas com cinco doses de enxofre (0, 20, 40, 60 e 80 mg/dm3), as quais foram parceladas em quatro aplica\ue7\uf5es: 0, 30, 60 e 90 dias ap\uf3s o primeiro desbaste. Ap\uf3s 150 dias da semeadura foram colhidos dados de altura, di\ue2metro do coleto, mat\ue9ria seca da parte a\ue9rea e de raiz, al\ue9m das rela\ue7\uf5es altura/di\ue2metro do coleto, altura/massa seca parte a\ue9rea, massa seca parte a\ue9rea/massa seca de raiz e o \uedndice de qualidade de Dickson (IQD). A adi\ue7\ue3o de doses crescentes de pot\ue1ssio ao substrato apresentou resposta significativa (quadr\ue1tica) para todas as vari\ue1veis avaliadas, exceto para a rela\ue7\ue3o altura da parte a\ue9rea/di\ue2metro de coleto, j\ue1 as doses de enxofre n\ue3o apresentaram resposta significativa para nenhuma das caracter\uedsticas avaliadas nesse experimento, sendo observada intera\ue7\ue3o entre K e S para altura da parte a\ue9rea, nas mudas de vinh\ue1tico aos 150 dias ap\uf3s a semeadura. Diante dos resultados obtidos recomenda-se para produ\ue7\ue3o de mudas de vinh\ue1tico (Platymenia foliolosa) a aplica\ue7\ue3o de 175 mg/dm3 de K e 45 mg/dm3 de S parceladas equitativamente em quatro aplica\ue7\uf5es aos 0, 30, 60 e 90 dias ap\uf3s o primeiro desbaste.The aim of this study was to evaluate the effect of potassium and sulfur on growth and quality of seedlings of Platymenia foliolosa Benth. (vinh\ue1tico), determining the best dose of these nutrients. An experiment was conducted using pots made of rigid polyethylene with a capacity of 1,5 dm3 and a red and yellow Latosol as the substrate. Seven doses of potassium were used as substrates (0, 50, 100, 150, 200, 250 and 300 mg/dm3) combined with five levels of sulfur (0, 20, 40, 60 and 80 mg/dm3), which were applied in four applications: 0, 30, 60 and 90 days after the first thinning. After 150 days of sowing collected data of height, collar diameter, aerial part dry weight and root, and the relationships height/collar diameter, height/ aerial part dry weight, aerial part dry weight/root dry weight and Dickson quality index (IQD). The addition of increasing doses of potassium to the substrate show significant (quadratic) for all variables, except for the ratio of aerial part height/collar diameter, the levels of sulfur showed no significant response to any of the characteristics evaluated in this experiment. There was an interaction between K and S to height of the aerial part in \u2018vinh\ue1tico\u2019 seedlings at 150 days after sowing. Based on these results, we recommend for seedlings of \u2018vinh\ue1tico\u2019 (Platymenia foliolosa) application of 175 mg / dm3 K and 45 mg/dm\ub3 S parceled out evenly in four times at 0, 30th, 60th and 90 days after first thinning