Determination of the interrelations between the apple root system and the physico-chemical soil properties

Abstract

The research objective was to determine the interrelationship between the root system of the eight year old apple trees (Malus domestica Borkh.) and the physical and chemical properties of the soil. Research was performed at the Moara Domneasca Research Station, located in the Romanian Plain, with the annual mean temperature of 10.5˚C and annual mean rainfall of 548 mm. The soil is Chromic Luvisol with (clayey) argicBt horizon. To determine the root system distribution and the root section area in July 2015 we sampled two soil profiles from the apple plantation and performed comparative measurements with a 10/10 cm biometrical frame. Measurements were performed on the root system of Florina and Topaz (Vf) varieties, both grafted on M9 rootstock. Although the two varieties had different growth vigour and were grafted on the same low-vigour M9 rootstock, rooting was normal. Nevertheless, root system distribution was different, depending on the specific vigour of the variety: higher (1363.83 mm 2) in the Florina variety and lower and more superficial (451.6 mm 2) in Topaz (Vf). Comparing soil permeability to water (K sat.-mm/h) with the models for the root system distribution in the two varieties we noticed a relatively stable correlation.

Test de Germination des Graines de Ricin (Ricinus communis L.) Sous Différentes Contrainte Abiotiques

“…La capacité de germination (CpG) a également été calculée. Elle correspond au pourcentage de graines qui germent dans des conditions données (Tudor et al, 2017). L'expression mathématique de la capacité de germination est la suivante :…”