Abstract
Long-term experiences with mineral fertilizers, have the role to evaluate and to study what happens to the soil from different areas of one country. Soybean long term experiences have the purpose to create an optimal system of fertilization and amendation by establishing optimal economic dosage of fertilizers and energy, taking into account all crop and soil-climatic conditions Along with genetic factors, technological factors mainly mineral fertilization and climatic conditions have a great influence on soybean production. The present study aims to evaluate the influence of phosphorus and nitrogen doses upon soybean yield obtained on cernoziom soil, in condition specific to Turda city, Romania. The long-term experiences were installed on Agricultural Research-Development Station Turda after the randomized blocks method, with 25 variants in 6 repetitions. The experimental factors and their graduations are: A: doses of phosphorous with 5 graduations: A1: P0, A2: P40, A3: P80, A4:P120, A5: P160; B: doses of nitrogen with 5 graduations: B1: N0, B2: N25, B3: N50, B4: N75, B5: B100; C: experimental years with 5 graduations: C1:2009, C2: 2010, C3: 2011, C4:2012, C5:2013, from these, 2 years are dry (2009 and 2011), 2 years are normally (2012 and 2013) , and 1 year very wet. We observed that P80, P120, P160 dosages have significant, distinct significance and very significant influence on soybean production; the yields registered are higher having values between 100 and 350 kg\/ha. In which concerns the influence of nitrogen doses we observed that on N75 and N100, yields are distinct and very significant, ranging between 100 and 250 kg/ha. Studying the interaction between the doses of nitrogen and those of phosphorus, we can observe that for the conditions specific to the experimental years taken in study the doses on which we obtained the greatest production are N100 P120, N100P80 and N75P80.
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