The influence of soil sample processing time on the determined content of N-NH4+, N-NO3- and Nan
2002
Kovacik, P. | Zaujec, A. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic))
The influence of natural drying time on Nan content soil was investigated by N-NH4+ and N-NO3- content determination in three time intervals (3, 24 and 48 hours after sampling, respectively). The relationship among determined Nan values and aboveground and underground biomass of the model crop (radish) was examinated by linear regression analysis. The result indicated that prolonging a drying time increased Nan content in soil. the lowest amounts were determined in fresh soil (3 hours aftere sampling) and the highest ones in dry soil (48 hours after sampling). Average difference in Nan contents between fresh and dry soil was as high as 76.6%. Correlations between an amount of model crop biomass and Nan concentrations in semi-dry and dry soil were closer in comparison with those of Nan determined in fresh soil. A dry or semi-dry sample was found to be more suitable than freshly taken soil sample for the Nan content determination to calculate nitrogenous fertilizer rates for radish (model crop)
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