Effect of Sulfur and Nod Factors (LCOs) on Some Physiological Features and Yield of Pea (Pisum sativum L.)

The response of pea var. Medal to treatment with Nod factors (LCOs) and mineral sulfur was estimated in a pot experiment with a completely randomized design. Foliar spraying of plants was performed at the 5-6 leaf stage (BBCH 15) at concentrations of 10(-12) M dm(-3) and 12 g S dm(-3) for LCOs and sulfur, respectively. The use of these factors, both individually and in combination, caused an increase in leaf area and "greenness" (SPAD), gas exchange parameters, straw and seed yields and in the root system. The number of nodules and respective nodule dry weight also increased with these treatments. A significant increase in seed yield resulted from the beneficial effects of LCOs and sulfur with an increase in the number of pods and seeds per plant compared to control plants, is clearly significant from the agricultural point of view. Although each factor improved the traits studied, the best results were achieved in the case of plants treated with both LCOs and sulfur.