Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 13 ISSUE 1
Written by Mihai BERCA, Roxana HOROIAŞ

The Pedoclimatic Index (PCI) calculated by us is the product between the Aridity Index (AR) and the soil fertility status expressed through number of creditworthiness points (CWS – Creditworthiness of Soil): PCI = AR x CWS . Was used AR calculated after UNEP (United Nations Environment Programme) instead of the older De Martonne index. Determinations were performed in 6 different pedoclimatic areas, in which PCI has varied from 12 to 47. Taking into account that AR varies between 0,20 and 1,00 in Romania, while CWS is between 0 and 100, theoretically PCI can range in the interval 0-100 and practically from 10 to 50. For each PCI was calculated the wheat production according to the Technological Processes Intensity (TPI), Creditworthiness (CWS), them also with marks from 1 to 10, and the wheat production pattern was made based on the two parameters. It appears that at a very reduced and reduced index of the technological processes (TPI between 1-4) the wheat yields level is very slightly influenced by the pedoclimatic quality of the culture area. In the areals of culture with PCI below 15 the production can’t reach 30 q/ha, irrespective of the quality of technological processes. At PCI of over 40 the production achieves 60 q/ha if there are applied superior technologies and if the working capital is optimum used. At PCI between 30 and 40 the maximum yield that can be reached in conditions of highest technical and qualitative value of production slightly exceeds 50 q/ha. All these models and nomograms are useful to agricultural management in order to estimate the production, but also for her optimization.

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