EFFECT OF BIO-ORGANIC FERTILIZERS ON SEASONAL CHANGES OF INORGANIC NITROGEN FORMS IN THE SOIL UNDER WINTER WHEAT

摘要

The experiment was conducted during the growing season 2007/8 and 2008/2009 in an experimental field. The effect of bio-organ fertilizers Condit Mineral and Condit Eco on the dynamics of inorganic nitrogen in the soil under winter wheat was investigated. The soil we sampled monthly from two sampling depths (0.0 - 0.3 m and 0.3 - 0.6 m). In these samples, we determined the contents of inorgan nitrogen forms in 1 % solution of K_2SO_4, by using the colour method. Changes in inorganic nitrogen forms were observed in connection wr several variables as the sampling depth, sampling date content and others. The higher contents of N-NH_4~+ were determined in the first ye; (2007/2008), the average content of N-NH_4~+ in this year was 6.657 mg kg~(-1) and thehigher contents of nitrate nitrogen were determinate the second year (2008/2009), the average content of N-NO_3~- in this year was 6.681 mg kg~(-1), the average content of N-NO_3~- was 5.78 mg kg The results of experiment confirmed that the greater dependence on the dynamics of inorganic nitrogen in the soil had climate conditior during the growing season than the applied fertilizers. Differences between fertilized treatments were statistically no-significant. The highi content of inorganic nitrogen was in the autumn underCondit Mineral fertilizer application.