Published in AgroLife Scientific Journal, Volume 11, Number 1
Written by Radu BERTICI, Daniel DICU, Mihai HERBEI, Florin SALA
The study evaluated the interdependence relationship between certain agrochemical indices of soil fertility. Soil reaction (pH), organic matter (H), nitrogen index (NI), base saturation degree (V), phosphorus (P) and potassium content (K) were analyzed. The variation of NI in relation to H was described by a polynomial equation of degree 2, inconditions of R2 = 0.876, p = 0.0151. Mobile phosphorus soil content (P) in relation to soil pH was described by a polynomial equation of degree 2, and from the derivation of the equation was obtained the value of pH = 6.77 at which P had high mobility in soil, and high accessibility for plants. The P variation was analyzed by regression analysis in relation to pH and V, under conditions of R2 = 0.817. The distribution in 3D form and in the form of isoquants of the P values in relation to soil pH and V was obtained. The variation of K was analyzed by regression analysis in relation to pH and P (R2 = 0.776), and in relation to pH and NI (R2 = 0.949) respectively. The graphical distribution in 3D and isoquants form of the K values in relation to pH and P, respectively in relation to pH and NI was obtained.
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