Archive > Volume 36 Issue 4 > 1999,36(4):448-453. DOI:10.11766/trxb199712090403 CSTR:[cstr] Prev Next
FATE OF THREE NITROGEN FERTILIZERS APPLIED TO A BLACK SOIL GROWING SPRING WHEAT
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Abstract:
Fate of urea, ammonium bicarbonate and potassium nitrate applied to a black soil growing spring wheat was investigated by the 15N tracer technique and microplot in the field. The experiment was conducted in suburbs of Hailun city, Heilongjiang Province. Nitrogen fertilizer at a rate of N 75 kg/hm2 was deeply placed in 10 cm soil layer. Results showed that deep placement is an effective measure to decrease nitrogen loss and. increase the efficiency of fertilizers N utilization in spring wheat black soil system. The plant recoveries of potassium nitrate (58.4%) and urea (55.9%) were comparable, and significantly higher than that of ammonium bicarbonate (42.6%). The residual N in soil from applied potassium nitrate (28.7%) was significantly lower than urea (38.2%) and ammonium bicarbonate (38.8%). The total nitrogen losses for the three sources of N fertilizers were in the range of 5.8%-18.6% with the lowest from urea and the highest from ammonium bicarbonate. The priming effect of N fertilizers applied to the black soil was rather low. Results also showed that about 1/3 of the N taken up by wheat was derived from the applied N fertilizers and 2/3 from soil.
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