科研之友
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摘要
given the importance of nitrogen fertilization in the production of tulip (tulipa gesneriana l.) bulbs and the limited information relative to this crop in chile, a study was conducted to characterize its growth and nitrogen uptake. tulips were cultivated outdoors and included two deflorations. bulbs of the variety negrita, 7-9 cm, were planted. a randomized complete blocks design was used with five treatments: 0, 70, 120, 160 and 200 kg n ha-1 and three replications. periodically, plants were sampled to analyze their growth and n content. accumulation of dry matter and n of the entire crop and individual plants were not significantly affected (p%26gt;0.05) by nitrogen fertilization, undoubtedly because of the high n supply from the soil. however, bulbs increased n concentration at harvest (p%26lt;0.05) and reached marketable size. daily growth rates and n uptake by plants and individual organs exhibited similar patterns. nitrogen fertilization should be divided: in early winter to promote later leaf expansion and then in full spring to cover the period of maximum crop growth and n uptake.
