Efectos de los macronutrimentos en el crecimiento y acumulación de materia seca en marañón (Anacardium occidentale L.)

Abstract

In a sand culture experiment the effects of varying concentrations of N, P, K, Ca, Mg and S on the growth of cashew were investigated. Both deficiencies and excesses of the nutrients depressed the rate of growth and dry matter accumulaion. Only in the case of nitrogen was any visual deficiency symptoms observed. This was characterised by general yellowing of the leaves particulary the old ones as described in the literature for many crops. Cashew seems to be less demanding than many plants in its nutritional requiriments. The concentrations of the ions in 4 months old leaves below which deficiencies may likely occur are K - 0.342; Ca - 0176; Mg - 0.088; N - 1.24; P- 0.118 and S - 0.070 per cent of the dry matter.