Published in Scientific Papers. Series B, Horticulture, Vol. LXVIII, Issue 1
Written by Viorel STOICA, Dorel HOZA
The aim of this study was to evaluate the influence of organic fertilizers on some soil agrochemical indicators, such as: soil reaction (pH), content of soil in organic carbon, humus, total nitrogen, total phosphorus and total potassium. Research was carried out in an apple demonstrative plot established in 2010 at Maracineni, in a private farm from Arges County. In 2022 the following fertilization variants were applied: V1 - Unfertilized; V2 - Biohumus – 0.5 l/tree, soil application + Macys BC 28 – 2 l/ha, foliar application + Cifamin BK – 1 l/ha, foliar application; V3 - Biohumus – 0.7 l/tree, soil application + Macys BC 28 – 2 l/ha, foliar application + Cifamin BK – 1 l/ha, foliar application; V4 – Biohumus – 0.9 l/tree, soil application + Macys BC 28 – 2 l/ha, foliar application + Cifamin BK –1 l/ha, foliar application; V5 – manure – 20 t/ha. The following determinations were carried out: pH in aqueous solution mix soil:water = 1:2.5 (potentiometric method); organic carbon according to the Walkley Black method, respectively the humus by calculation; the total nitrogen was determined by the Kjeldahl method; the total phosphorus was determined spectrophotocolorimetric, the Egner-Riehm-Domingo method; the total potassium was determined flamphotometrically from the same extract obtained when determining the phosphorus. Fertilization with manure in a dose of 20 t/ha (V4), has led to an improvement of soil acidity, increased soil content in humus, nitrogen, phosphorus and potassium compared to the unfertilized variant and with the other fertilization variants.
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