INSTALLMENT OF POTASSIUM FERTILIZATION IN THE GROWTH OF Myracrodruon urundeuva seedlings

Abstract

The species Myracrodruon urundeuva, popularly known as aroeira, is a native tree considered to be versatile due to its diversity of uses, indicated in construction, medicinal treatments and for recovering degraded areas. The nutritional requirements and the effects of each element on the growth and nutrition of the majority of native forest species are still unknown, and so this study looked at the effect of potassium dose and parceling on the growth of M. urundeuva seedlings using morphological characteristics. The experimental design was randomized blocks with 7 treatments and 4 replications of 5 plants. These were: (T1) Commercial substrate; (T2) 100 g of K.t-1 of substrate at sowing; (T3) 100 g of K. t-1 of substrate - ½ at sowing and ½ at 30DAS; (T4) 100 g of K. t-1 of substrate - ⅓ at sowing, ⅓ at 30DAS and ⅓ at 45 DAS; (T5) 300 g of K. t-1 of substrate at sowing. t-1 of substrate at sowing; (T6) 300 g of K. t-1 of substrate - ½ at sowing and ½ at 30DAS and (T7) 300 g of K. t-1 of substrate - ⅓ at sowing; ⅓ at 30DAS and ⅓ at 45 DAS. The observed results indicate that potassium fertilization was promising for the growth of M. urundeuva seedlings at 60 DAS only for the variable number of leaves, where it is suggested to use 300g of K.t-1 of substrate and the installment of ⅓ at sowing; ⅓ at 30DAS and ⅓ at 45 DAS.