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Effects of Nitrogen Forms on Content and Distribution of Nitrate and Oxalate Forms in Spinach Plants Influence of Cytokinin and Ammonium Nitrate on Elongation of Adventitious Buds in Norway Spruce(Picea abies) Effects of biochar and biochar-based ammonium nitrate fertilizers on soil microbial biomass carbon and nitrogen and enzyme activities Effects of nitrogen fertilization on leaching characteristics of NO3--N and base cations in latosol Effects of Nitrogen Forms on Content and Distribution of Nitrate and Oxalate Forms in Spinach Plants