Activity of symbiotic nitrogen fixation and common vetch productivity depending on soil pH, amount of phosphorus, potassium, boron and molybdenum
Khramoi, V.K.; Posypanov, G.S.; Rakhimova, O.V.
Izvestiya Timiryazevskoi Sel'skokhozyaistvennoi Akademii 1996(2): 56-71
Greenhouse experiments with common vetch Nemchinovskaja 84 were conducted in Kaluzhsky branch of Moscow Agricultural Academy in 1989-1990 and in 1993. In the experiment with different levels of soil acidity the highest possible values of nodules weight and of nitrogenase activity have been obtained over the range of pH 6.0-7.1, and the highest possible yield of seed - with pH 6.6. In the experiment with different P-2O-5 content the highest possible values for indicators of vetch symbiotic activity and productivity were found at P-2O-5 levels equalling 165 mg per 1 kg of soil. In the experiment with different levels of K-2O its optimum content was within 60-120 mg per 1 kg of soil, and in the experiment with boron and molybdenum the best variant proved to be that of combined application of these microelements.