Nutrients absorption by Passiflora edulis, Sims, and Passiflora edulis F flavicarpa, Deneger, plants

Abstract

In order to evaluate the absorption of the macro and micronutrients by two varieties (amarelo and roxo) of the genus Passiflora, plants were cultivated under field conditions. Every thirty days from the 75th day, until 370 days plants were harvested and divided into: root, stem, leaf and fruit. All the parts were run through chemical analysis for N, P, K, Ca, Mg, S, B, Cu, Fe, Mn and Zn. The data obtained allowed for the following main conclusions: 1) The initial rate of growth of the Passiflora plant, judged by the determanations of the dry weigth matter is rather slow until the age of 190 days. 2) The uptake of the nutrients is small until the first flowers (190 days). From there on the absorption is intensified (The results are at hand on tables (Quadros, in Portuguese text) III, IV and V. 3) The following maximum amounts of nutrients were absorbed by a population of 1,500 plants: N-205 kg.; P-18 kg.; K-184 kg.; Mg-16 kg.; S-25 kg.; B-295 kg.; Cu-198 g.; Fe-779 g.; Mn-2,810 g.; Zn-316 g..