Seasonal changes in biochemical and microbiological activity of soil against the background of differentiated irrigation in an apple tree orchard after replantation
¹Research Center for Agricultural and Forest Environment, Polish Academy of Science,
60-809 Pozna�, Poland; e-mail: email@example.com
²Department of Agricultural Microbiology, University of Life Science, Pozna�, 60-656,
The objective of the studies included seasonal changes in the activity of enzymes, emission CO2 and microbiological activity of soil against the background of differentiated irrigation in an apple tree (Malus domestica) orchard after replantation. The most important activity of enzymes and the number of microorganisms were confirmed in the seasons of spring and autumn, while the lowest activity was observed in summer. The highest dehydrogenase activity was found in the last year (from 0.43 to 2.42 cm3 kg-1) and the lowest the in second year (from 0.19 to 0.58 cm3 kg-1). A high protease activity was recorded in the last year (from 1.25 to 12.08 mg kg-1) and low in the second year (from 1.65 to 3.47 mg kg-1). The highest urease activity was observed in the first year (from 1.17 to 6.42 �mol g-1) and the lowest in the second year (from 0.74 to 2.82 �mol g-1). High intensity of emission CO2 was noted in summer. The highest CO2 emission was found in the last year (from 29.32 to 46.86 mg kg-1) and the lowest in the second year (from 15.35 to 27.95 mg kg-1). The highest number of fungi was found in the soil of the combination without irrigation – W0. A high number of Azotobacter, actinomycetes, proteolytic bacteria, phosphate solubilizing bacteria, enzymes activity and CO2 emission almost always were observed in the soil in the irrigation combination – W1 or W2.