Researches Regarding the Relationships between Different Parameters of the Soil-Water-Plants-Atmosphere System and Yield in Soybean from Crişurilor Plain

Abstract

The soil-water-plant-atmosphere system is characterized by the following indicators: number of days with pedological drought; de Martonne aridity index and plants water consumption.

The researches carried out during 2007-2009 in an experiment with 6 variants with different water provisionment placed on the preluvosoil from Agricultural Research and Development Station Oradea.

Pedological drought was considered the period when on the watering depth (0-75 cm) the soil water reserve decreased below easily available water content; ten to ten determination of the soil moisture and the graphs of the soil water reserve dynamics permitted to quantify these periods. An inverse links, very significant statistically were determined between pedological drought and water consumption respectively quantity and quality (protein content) of the yields and a direct link very significant statistically was quantified between this indicator and yield gains determined by irrigation. The increase of the de Martonne aridity index values determined the increase of the plants water consumption, the yield gains and the increase of the grain protein content; the correlations are very significant statistically. Direct link very significant statistically, was registered between plants water consumption and soybean yields. All these correlations sustain the irrigation opportunity in soybean from Crisurilor Plain.

Keywords: pedological drought, de Martonne aridity index, plant water consumption, irrigation, yield, soybean

JEL Classification: A10