Studies on mineral nutrition of passion-fruit: VII - effects of micronutrients on growth and mineral composition of the plants

Abstract

The present research had the following goals: (1) to assess the effect of mineral deficiences on early growth and mineral composition of the several plant organs; (2) to obtain analytical data which would permit to distinguish between healthy and deficient plants. The conclusions obtained are as follows: 1. growth was affect primarily by the deficiency of Cu. The lack of B, Fe, Mo, Mn and Zn had less effects. 2. the following leaf values for healthy plants were obtained: B - 112,5 ppm; Cu - 13,0 ppm; Fe - 597,3 ppm; Mn - 31,0 ppm; Mo - 1,04 ppm; Zn - 28,3 ppm. 3. The nutritional status of the plants seems to be revealed better in the following organs: leaves of mature stem: Cu, Mn; leaves of the developing stem: B, Mo; new vines: Cu, Fe and Zn.