2002•Unpublished venueRequires access
THE FATE OF FERTILIZER NITROGEN IN WINTER WHEAT UNDER DIFFERENT WATER AND NITROGEN LEVELS
Li Shi
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Abstract
N uptake and the fate of fertilizer N were studied in the field under different water and nitrogen levels with 15 N technique.Results showed that (1)the total N uptake of economical N treatment under saving irrigation was higher than that under conventional irrigation.Under saving irrigation the total N uptake of conventional N was higher than that of economical N treatment,yet the NHI decreased;(2)compared with saving irrigation,the N loss of conventional irrigation increased and NUE and soil residue decreased.On the same water condition the NUE and soil residue of conventional N treatment was lower than that of economical treatment,and N loss increased;(3)for the same fertilizer amount,the loss of N applied all as basal fertilizer is lower than that of part as basal and part as top dressing treatment.