Importance of organic matter for soil biota
1998
Stevlikova, T. | Vjatrakova, J. | Javorekova, S. (Slovak Agricultural Univ., Nitra (Slovak Republic). Department of Microbiology)
Changes in some chemical properties of the soil (C sub(ox), pH, N1) and in the numbers of basic microbial associations due to fertilization, irrigation and farming systems were studied for grassland soil and arable land of two types, Chernozem and Orthic Luvisol. Plate dillution method was used for determination of numerous microorganisms. The site with the highest dynamic homeostasis of soil biological component was the grassland soil in Chyzerovce, which has even retained its original state after 15 years of the application of mineral fertilizers (100, 200 or 250 kg N/ha) and multiple grass cutting. As a result of regular cutting and lossless harvest, there was a decrease in contents of C sub(ox) and N sub(t), which had no influence on the number of soil microorganisms. Also, chernozem represented a stable soil system, with no changes in C sub(ox), N sub(t) or pH after 20 years of irrigating. Due to irrigation, an amount of bacteriocenose decreased indirectly through changes in soil texture composition by increasing a proportion of clay particles (44.1%). A long-term application of mineral fertilizers (4, 5 or 18 years) promoted the mineralization of soil organic matter and induced the acidification of soil environment, depending on a rate of fertilizers, effect duration and soil type. The same rate of fertilizer had more agressive effect on arable land than on grassland soil. Four years of ecological farming with regular application of manure had the positive effect on the parameters studied. The percentage of Cox and N1 increased up to 1.29 and 0.230%, respectively. There was also a rise of abundance of bacteriocenose, but a pH value reduced
Mostrar más [+] Menos [-]Palabras clave de AGROVOC
Información bibliográfica
Este registro bibliográfico ha sido proporcionado por Agricultural Knowledge and Innovation Institute