Abstract
"The degradation of natural soil fertility is caused by practicing the classic tillage system (ploughing with the furrow return) and using high doses of chemical fertilizers. It is necessary to adopt soil tillage techniques that aim to preserve and improve soil fertility without decrease production. In Romania, soybean crop, could be an economic boost for the agriculture sector because it reduces the costs required for the procurement of vegetable protein needed for the livestock and food sector, soybeans being a plant that fixes nitrogen from various sources (precipitation, activity of Bradyrhizobium japonicum bacteria, humus mineralization and residual nitrogen). From the research conducted between 2018-2020 at ARDS Turda, regarding the soybean root nodules cultivated in four tillage systems (CS - plough, MC - chisel, MD - disk and NT- direct sowing) with the technology specific to each system, the results indicate that in a conservative system the soybeans yield correlates positively with the number and weight of nodules formed. Organo-mineral fertilization (green fertilizer - autumn rape + gulle manure + N40P40) contributes significantly positively to the number and the weight of nodules and increases the yield. As an alternative to the CS, soybean can be cultivated in a minimum tillage system (MC), the yield difference compared to the classical system (plough) being insignificant, just 38 kg. The pedo-climatic conditions of the experimental area it is favourable for this crop and for the fixation of atmospheric nitrogen, without requiring high doses of mineral fertilizers."
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