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It remains unclear if crops can change their preference for NH4+ or NO3− during their growth stages in alpine habits. Here, we conducted a field experiment using 15N-labelled NH4+ and NO3− to examine the preference for mineral N forms by four crop species (highland barley, forage oat, alfalfa and common vetch) at three growth stages in a Tibetan cropland. Twenty-four hours after 15N labeling, plant...