Nutrient content in jambu plants cultivated in a protected environment in the municipality of Paragominas (PA)

Abstract

The importance of quantifying the nutrients accumulated in plants is to assess the real need of the plant by carrying out the fertilization recommendations properly. With the objective of evaluating the levels of macro and micronutrients in the jambu culture cultivated in a protected environment, as well as quantifying their need in relation to the elements throughout its cycle. The experiments were carried out in a protected environment in the horticulture experimental area of the Universidade Federal Rural da Amazônia, Paragominas/PA campus, from February to March 2016. A completely randomized design was used. To obtain the samples, the sowing was initially carried out in a tray of expanded polyethylene with 128 cells containing the commercial substrate Peat fertile, then the trays were taken to the nursery, after 24 days the manual transplant of the jambu seedlings was carried out to which 25 polyethylene pots were used, which were completely filled with substrate obtained from a mixture of Yellow Latosol (50%) and black sand (50%), both were sieved and incorporated together with 50g NPK (10-28-20). Jambu grown in a protected environment responds like other vegetables in relation to levels of nutritional requirement in leaves, showing the contents in decreasing order of concentration: K > N > Ca > Mg > P > S, unlike the root where they were found in the following order: K > Mg > N > Ca > P > S. The nutrient found in significantly higher concentrations was K, reaching a peak at 24 DAT with concentrations of 90 g/kg. On the other hand, the micronutrients presented themselves differently in relation to the levels of nutritional requirement, presenting in the leaf: Fe > Na > B > Mn > Zn > Cu, and in the root Fe > Na > Mn > B > Zn > Cu. Fe fluctuated the values of accumulation levels, but in general it maintains results greater than 600 mg/kg.