Mineral nutrition of red beet plants and the nitrogen balance at the application of N2-fixing and non-N2-fixing bacteria | Минеральное питание растений столовой свеклы и баланс азота в почве при внесении азотфиксирующей и не фиксирующей азот бактерий
2009
Shabaev, V.P., Russian Academy of Sciences, Pushchino (Russian Federation). Institute of Physicochemical and Biological Problems in Soil Science
The effect of red beet inoculation with non-N2-fixing bacterium Pseudomonas fluorescens 20 and N2-fixing bacterium P. putida 23 on the yield and mineral nutrition of red beet plants was examined in microplot experiments on gray forest and floodplain soils. The inoculation with bacterium P. putida 23 increased the yield of crop and the uptake of soil and fertilizer nitrogen by plants. The uptake of P, K, Ca, Mg, Fe, Na, Zn, Mn, and Cu also increased without significant changes in the content of most elements in the roots and above-ground organs of plants. The inoculation of red beet with P. fluorescens 20 did not reliably increase the crop yield and increased the uptake of nutrients in plants to a lesser extent compared to P. putida 23. The inoculation of red beet with P. putida 23 stimulated the nitrogen-fixing activity in the rhizosphere of red beet. A statistically significant additional input of nitrogen to the soil from the atmosphere was observed at the inoculation with bacterium P. putida 23; the nitrogen balance on the soil-plant system became positive at the end of the experiment. In a balance pot experiment on a floodplain soil, it was found that nitrogen input in above system was associated to the contribution of N2 fixed in the rhizosphere into red beet plants inoculating with this bacterium. The addition of bacterium P. putida 23 allowed decreasing the rates of NPK fertilizers by two times for red beet grown on floodplain soil in a microplot experiment without decrease in root yield
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