Incidence of the potassium/calcium plus magnesium ratio on the conifer fertigation for peat substrates

Abstract

The methodology given in this paper is designed to improve the cation nutrition of Cupressus glabra (Sudworth Little) growing on peat substrates for ornamental purposes. The methodology consists of studying the potassium/ calcium + magnesium (K/Ca+Mg) ratio first in sand cultures and then using the corresponding nutrient solution in the substrates. The interaction between the substrate and the nutrient solution is studied in the process. The analysis of the saturation extract of the substrate and the controlling the nutritional status of the plant by analysing its leaves and sap allowed for the establishment of the limiting growth factors for each substrate. Consequently, these factors can be corrected by adapting the nutrient solution. The methodology designed can be used with other conifers.