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A pot experiment was conducted to evaluate the effect of nitrogen (N) fertilizer and maize straw incorporation on the accumulation of NH 4+ - 15 N and NO 3- - N in soil inorganic N pool among three consecutive cropping cycles, aimed to search for an effective N management practice to decrease superfluous accumulation of soil inorganic N and fertilizer N losses. The results showed that the amounts of soil NH 4+ - 15 N, NO 3- - 15 N and inorganic 15 N, and their percent to applied 15 N-labeled fertilizer declined significantly with sampling time ( p ≤ 0.001). Compared to low N application rate (44.64 mg N kg -1 soil), high N application rate (89.28 mg N kg soil) enhanced significantly the amounts of soil NH 4+ - 15 N, NO 3- - N and inorganic 15 N by 238.6%, 132.9% and 197.3%, respectively ( p ≤ 0.001). In contrast, maize straw addition declined significantly the amounts of soil NH 4+ - 15 N and inorganic 15 N by 21.4% and 16.1% compared to without maize straw ( p ≤ 0.001). The results suggested that a combined application of chemical fertilizer and maize straw with a wide C/N ratio is an important means for reducing the superfluous accumulation of fertilizer N as soil inorganic N to subsequently lower its loss.

journal of soil science and plant nutrition

EFFECT OF NITROGEN FERTILIZER AND MAIZE STRAW INCORPORATION ON NH4+15N AND N0(3) -15N ACCUMULATION IN BLACK SOIL OF NORTHEAST CHINA AMONG THREE CONSECUTIVE CROPPING CYCLES