V. Koteva Abstract. The investigation was carried out in a field certified for organic agriculture, on soil type Pellic vertisol (FAO) during 2004 – 2012. The changes in soil acidity, total humus content and reserves of mineral nitrogen, mobile phosphorus and available potassium in so

Z. Zlatev, V. Popov Abstract. The aim of this study was to investigate the effect of organic fertilization on photosynthesis of young tomato plants (Lycopersicon esculentum Mill.) – cv. Trapezica and cv. Yana. The field experiments were carried out at the experimental field of the Agr

I. Răducuţă, A.T. Bogdan, I. Van, D. Rebega, C. Fabian, I. Grosulescu Abstract. Organic agriculture can successfully contribute to a sustainable development of the Romania’s rural areas because in our country there are extremely favorable conditions for practicing of large-scale