Evaluarea stării de fertilitate a solului la viţa de vie, sub influenţa fertilizării chimice, în contextul agro- eco-pedologic al podgoriei Huşi, România

The fertilization of vine plantations aims at amplifying and intensifying the productive capacity of fruitful vineyards, in close correlation with the effect-efficiency- effort triad. A system of balanced fertilization, which can ensure efficiency and economy, and also keep the environment free of pollutants, requires knowledge of interrelations between soil, plant and fertilizer material. Obtaining some higher and stable grape crops can be achieved by knowing all the factors involved in growth and vine development, starting with genetic, biological, agro-phyto-technical factors and continuing with the eco-pedologic ones that may be considered restrictive. The paper shows the evolution of some forms of accessible nutrients and of some agrochemical soil indices under the influence of additional fertilization in a vineyard from a relatively homogeneous area in terms of pedologic factors, respectively Husi Vineyard. The fertilizers used were Cx 15-15-15 and Cx 5-15-25, use fractionally in two phenophases, bursting of buds and intense growth of the shoots, in doses of 100 150 and 200 kg/ha a.s. At the end of vegetation, in 2014, there were determined and analyzed the content of soil with phosphorus and potassium, accessible forms, humus content, degree of saturation in bases, carbon content, micro-elements content - B, Zn, Cu, Mn. The use of phasal fertilizer led to the improvement of phosphorus and potassium content, up to values of 57 and 420 ppm respectively (200kg/ha a.s.), comparable to the optimum values. The other agrochemical indicators varied in relation to dose and NPK ratio, confirming the effect of basic fertilization in completion to the additional fertilization