Crescimento, teores foliares e taxa relativa de absorção de N, P e K em Moringa oleifera Lam. Com adubação orgânica em Neossolo Flúvico

Abstract

The objective of this study was to evaluate the growth, mass production, foliar contents and relative absorption rate of N, P and K in Moringa oleifera Lam. Fertilized with four doses of chicken bed (0.0, 40.0, 80.0 and 120.0 g dm-3) and two particle sizes (1 and 4 mm). The experiment was conducted in a randomized complete block design with four replicates. The experimental unit consisted of four seedlings, produced in polystyrene bags with a capacity of 5 dm-3. For growth analysis, height, leaf number, stem and root diameter, and fresh and dry matter mass and Dickson quality index were evaluated every 30 days, up to 120 days, with a total of four evaluations. The contents and rate of nitrogen, phosphorus and potassium absorption were evaluated at 60 and 120 days of experiment. Root diameter decreases with increasing doses of chicken litter; the aerial and root dry matter masses increased with increasing doses of chicken litter. There was a linear increase in the Dickson quality index as a function of days after emergence and of chicken bed doses, reaching a maximum value of 3.0, with 120 g dm-3 of chicken litter. The 1 mm granulometry provided higher decreases in the relative rate of nitrogen absorption. The relative rate of potassium uptake increased by 50.6% with the increase in chicken litter doses, while there was a decrease in phosphorus levels due to the increase of chicken bed doses with a diameter of 1 and 4 mm. There was an increase in nitrogen and potassium leaf contents due to the increase of chicken bed doses. It is recommended the dose of 120 g dm-3 to obtain the highest contents and rate of absorption.