[Adam, G., Duncan, H. (2001). Development of a sensitive and rapid method for the measurement of total microbial activity using fluorescein diacetate (FDA) in a range of soils. Soil Biol. Biochem., 33, 943-951.10.1016/S0038-0717(00)00244-3]Search in Google Scholar
[Archer, F., Manu, A., Laymon, C. A., Senwo, Z. N., Coleman, T. L. (1999). Soil moisture variability on the landscape as a function of land use: Implication for remote sensing of surface soil moisture. In: IGARSS '99 Proceedings. IEEE 1999 International, Geoscience and Remote Sensing Symposium, Hamburg, 28 June - 2 July. Vol. 2, pp. 1102-1004.10.1109/IGARSS.1999.774546]Search in Google Scholar
[Bolton, H., Elliott, L. F., Papendick, R. I., Bezdicek, D. F. (1985). Soil microbial biomass and selected soil enzyme activities: Effect of fertilization and cropping practices. Soil Biol. Biochem., 17 (3), 29 -302.]Search in Google Scholar
[Brooke, P. (2001). The soil microbial biomass: Concept, measurement and applications in soil ecosystem research. Microb. Environ., 16, 131-140.10.1264/jsme2.2001.131]Search in Google Scholar
[Carter, M. R., Noronha, C., Peters, R. D., Kimpinski, J. (2009). Influence of conservation tillage and crop rotation on the resilience of an intensive long-term potato cropping system: Restoration of soil biological properties after the potato phase. Agric. Ecosyst. Environ., 133, 32-39.10.1016/j.agee.2009.04.017]Search in Google Scholar
[Chen, W., Hoitink, H. A. J., Schmitthenner, A. F., Tuovinen, O. H. (1988). The role of microbial activity in suppression of damping-off caused by Pythium ultimum. Phytopathology, 78 (3), 314-322.10.1094/Phyto-78-314]Search in Google Scholar
[Franchini, J. C., Crispino, C. C., Souza, R. A., Torres E., Hungria, M. (2007). Microbiological parameters as indicators of soil quality under various soil management and crop rotation systems in southern Brazil. Soil. Till. Res., 92, 18-29.10.1016/j.still.2005.12.010]Search in Google Scholar
[Grandy, A. S., Robertson, G. P., Thelen, K. D. (2006). Do productivity and environmental trade-offs justify periodically cultivating no-till cropping systems? Agron. J., 98, 1377-1383.]Search in Google Scholar
[Govaerts, B., Mezzalama, M., Sayre, K. D., Crossa, J., Lichter, K., Troch, V., Vanherck, K., De Corte, P., Deckers, J. (2008). Long-term consequences of tillage, residue management, and crop rotation on selected soil micro-flora groups in the subtropical highlands. Appl. Soil. Ecol., 38, 197-210.10.1016/j.apsoil.2007.10.009]Search in Google Scholar
[Hayano, K. (1997). Measurement of soil enzyme activity. In:Experimental Methods in Soil Microbiology (pp. 365-367). Hattori, T., Nishino, T., Miyashita, K. (eds.). New Edition, Youken-dou, Tokyo (in Japanese).]Search in Google Scholar
[Hungria, M., Franchini, J. C., Brandao-Junior, O., Kaschuk, G., Souza, R. A. (2009). Soil microbial activity and crop sustainability in a long-term experiment with three soil-tillage and two crop-rotation systems. Appl. Soil Ecol, 42, 288-296.10.1016/j.apsoil.2009.05.005]Search in Google Scholar
[Kandeler, E., Gerber, H. (1988). Short-term assay of soil urease activity using colorimetric determination of ammonium. Biol. Fertility Soils, 6, 68-72.10.1007/BF00257924]Search in Google Scholar
[Lagomarsino, A., Moscatelli, M. C., Di Tizio, A., Mancinelli, R., Grego, S., Marinari, S. (2009). Soil biochemical indicators as a tool to assess the short-term impact of agricultural management on changes in organic C in a Mediterranean environment. Ecol. Ind., 9, 518-527.10.1016/j.ecolind.2008.07.003]Search in Google Scholar
[Lejins, A., Lejina, B. (2008). The influence of crop rotation and plant-protection-complex on buckwheat and potato yield. Agron. Vestis, 11, 235-239.]Search in Google Scholar
[Mäder, P., Fliebach, A., Dubois, D., Gunst, L., Fried, P., Niggli, U. (2002). Soil fertility and biodiversity in organic farming. Science, 296,1694-1697.10.1126/science.1071148]Search in Google Scholar
[Martinez-Salgado M., Gutierrez-Romero, V., Jannsens, M., Ortega-Blu, R. (2010). Biological soil quality indicators: a review. In: Current Research, Technology and Education Topics in Applied Microbiology and Microbial Biotechnology. Mendez-Vilas A. (Ed.), pp. 319-328; <http://www.formatex.info/microbiology2/319-328.pdf>.]Search in Google Scholar
[Natywa, M., Sawicka, A., Wolna-Maruwka, A. (2010). Aktywnosc mikrobiologiczna i enzymatyczna gleby pod uprawq kukurydzy w zaleznosci od zroznicowanego nawozenia azotem. Woda-Srodowisko- Obszary Wiejsie, 10, 2(30), 111-120.]Search in Google Scholar
[Parkinson, D., Coleman, D. (1991). Microbial communities, activity and biomass. Agr. Ecosyst. Environ., 34 (1-4), 3-33.10.1016/0167-8809(91)90090-K]Search in Google Scholar
[Parmar, N., Dardarwal, K. R. (1999). Stimulation of nitrogen fixation induction of flavonoid like compounds by rhizobacteria. J. Appl. Microbiol., 86, 36-44.10.1046/j.1365-2672.1999.00634.x]Search in Google Scholar
[Pell, M., Stenström, J., Granhall, U. (2005). Soil respiration. In: Microbiological Methods for Assessing Soil Quality (pp. 117-126). Bloem, J., Hopkins, W. D, Benedetti, A. (eds.). Wallingford, Oxfordsire: CABI Publishing.]Search in Google Scholar
[Rancāne, S., Jansone, B., Tiltina, L. (2009). Griku audzesanas agrotehnika [Agrotechnics of buckwheat cultivation]. Agrotops, Nr. 6.]Search in Google Scholar
[Shannon D, Sen, A., Johnson, D. (2002). A comparative study of the microbiology of soil structure under organic and conventional regimes. Soil Use Manag., 18, 274-283.10.1079/SUM2002130]Search in Google Scholar
[Silva, A. P., Babujia, L. C., Franchini, J. C., Souza, R. A., Hungria, M. (2010). Microbial biomass under various soil- and crop-management systems in short- and long-term experiments in Brazil. Field Crops Res., 119, 20-26.10.1016/j.fcr.2010.06.012]Search in Google Scholar
[Stark, C., Condron, L. M., Stewart, A., Di, H. J., O'Callaghan, M. (2006). Effects of past and current crop management on soil microbial biomass and activity. Biol. Fert. Soils, 43 (5), 531-540.]Search in Google Scholar
[Sturz, A. V., Christie, B. R. (2003). Beneficial microbial allellopathies in the root zone: The management of soil quality and plant disease with rhizobacteria. Soil Tillage Res., 72, 107-123.10.1016/S0167-1987(03)00082-5]Search in Google Scholar
[Tate, R. L. (1995). Soil Microbiology. New York: John Wiley & Sons Incorporation. 398 pp.]Search in Google Scholar
[Trasar-Cepeda, C., Leiro's, M. C., Seoane, S., Gil-Sotres, F. (2008). Biochemical properties of soils under crop rotation. Appl. Soil Ecol., 39, 133-143.10.1016/j.apsoil.2007.12.003]Search in Google Scholar
[Tu, C., Louws, F. J., Creamer, G. J., Mueller, P. J. Brownie, C., Fager, K., Bell, M., Hu, S. (2006). Responses of soil microbial biomass and N availability to transition strategies from conventional to organic farming systems. Agr. Ecosyst. Environ., 113, 206-215.10.1016/j.agee.2005.09.013]Search in Google Scholar
[Tu, C , Ristaino, B. J, Hu, S. (2006a). Soil microbial biomass and activity in organic tomato farming systems: Effects of organic inputs and straw mulching. Soil Biol. Biochem., 38 (1-2) 247-255.10.1016/j.soilbio.2005.05.002]Search in Google Scholar
[Zagal, E., Munoz, C., Quiroz, M., Cordova, C. (2009). Sensitivity of early indicators for evaluating quality changes in soil organic matter. Geoderma, 151, 191-198.10.1016/j.geoderma.2009.04.004]Search in Google Scholar
[Клинцаре A. (1983). Пестициды и микрофлора растений [Pesticides and Microflora of Plants]. Рига: Зинатне, 165 pp. (in Russian).]Search in Google Scholar
[Павловича Д. (1978). Актиномицеты в Латвии [Actinomyces in Latvia]. Рига: Зинатне. 197 c. (in Russian).]Search in Google Scholar