Chinese Journal of Applied Ecology ›› 2012, Vol. 23 ›› Issue (09): 2497-2503.
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SUN Zhi-mei, ZHANG Kuo, LIU Jian-tao, SI Huan-sen, Wang Yan-qun
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Abstract: Soil incubation test and pot experiment were conducted to investigate the effects of dicyandiamide (DCD) and its combination with nano-carbon on the transformation of fertilizers (urea and ammonium bicarbonate) nitrogen (N) in meadow cinnamon soil, a typical soil type in North China Plain, and on the growth of pakchoi (Brassica chinensis). In the first two weeks after applying urea and ammonium bicarbonate, the soil NH4+-N and NO3--N contents varied greatly, but little variation was observed since then. The effects of the applied fertilizer N on the pakchoi growth and its N use efficiency differed significantly at early growth stages, but had little difference at harvesting stage. The DCD inhibited the transformation of the fertilizer N (especially ammonium bicarbonate N) into nitrate markedly, and this effect increased with increasing DCD dose. Under the conditions of our experiment, the optimal application rate of DCD was 1.0-1.5% of applied fertilize N, which could increase the pakchoi yield significantly, improve the leaf color, decrease the plant nitrate contents, and increase the fertilizer N use efficiency. The combination of DCD and nano-carbon exerted a synergistic effect on inhibiting soil ammonium oxidation, and also, promoted the pakchoi growth and N utilization at early growth stages significantly and decreased the plant nitrate level at harvesting stage.
SUN Zhi-mei, ZHANG Kuo, LIU Jian-tao, SI Huan-sen, Wang Yan-qun. Effects of nitrogen regulators on fertilizer nitrogen transformation in meadow cinnamon soil and on pakchoi growth.[J]. Chinese Journal of Applied Ecology, 2012, 23(09): 2497-2503.
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URL: https://www.cjae.net/EN/abstract/abstract10177.shtml
https://www.cjae.net/EN/Y2012/V23/I09/2497