Estimation of soil microbiological properties in relation to soil acidity and fertilization
2005
Lapinskas, E., Lithuanian Inst. of Agriculture, Klaipeda reg. (Lithuania). Vezaiciai Branch | Ambrazaitiene, D., Lithuanian Inst. of Agriculture, Klaipeda reg. (Lithuania). Vezaiciai Branch | Piaulokaite-Motuziene, L., Lithuanian Inst. of Agriculture, Klaipeda reg. (Lithuania). Vezaiciai Branch
The study was carried out to investigate the spread and efficiency of Rhizobium and other soil microorganisms physiological groups depending on soil acidity and fertilization. It was established that Rhizobium leguminosarum bv. trifolii and Rhizobium leguminosarum bv. viciae were most spread at soil pHKCL 5.6-6.0. In acid soils (pHKCL 4.1-5.0) Rhizobium galegae wasn't found and Sinorhizobium meliloti was hardly detected. Activity of nitrogenase by Rhizobium leguminosarum bv. trifolii in acid soil was 12.3 times lower than in neutral (pHKCl 6.2-6.7) soil. Rhizobium, depending on species and strains, fixed symbiotic nitrogen from 142 to 289 kg N haE-1. Liming increased the nitrogen fixation at 40-88 kg N haE-1. Ammonifying and mineral N assimilating microorganisms were spread most at the soil pHKCl 5.2-5.7 and in crop rotation fertilized with N45P30K45. The increase of fertilizer rates in acid soil inhibited amounts of microorganisms. The highest activity of organic matter mineralization was identified in neutral soil (pHKCL is greater than 6.7). However, favourable conditions for micromycetes occurrence were observed in acidic soils (pHKCL is less than 4.7).
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