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在土壤低氮(碱解氮68.85 mg/kg)条件下,以新台糖22号(ROC22)为试材,分别施用15N标记的尿素2.5、5.0、7.5 g/盆,研究了氮肥施用量对甘蔗氮素吸收与利用的影响。结果表明,随着氮肥施用量的增加,甘蔗干物质积累、氮素积累、来源于肥料氮素的比率及土壤有效氮含量不同程度增加,但甘蔗氮肥利用率显著下降;施氮量明显影响甘蔗各器官的干物质分配、氮素分配、氮肥利用率及氮素在不同土层的分布;甘蔗主要吸收20~40 cm土层的氮素。甘蔗施用氮肥应考虑适宜的量和土层深度。
Under the conditions of low nitrogen (68.85 mg / kg) nitrogen in soil, ROC22 was used as test material, and 15N labeled urea 2.5, 5.0 and 7.5 g / Effect of Nitrogen Absorption and Utilization. The results showed that with the increase of nitrogen application rate, the dry matter accumulation and nitrogen accumulation of sugarcane, the ratio of nitrogen from fertilizer and soil available nitrogen increased to some extent, but the nitrogen use efficiency of sugarcane decreased significantly; The dry matter partitioning, nitrogen allocation, nitrogen use efficiency and the distribution of nitrogen in different soil layers of different organs and organs were the main. Sugarcane mainly absorbed nitrogen in 20 ~ 40 cm soil layer. Sugarcane application of nitrogen should consider the appropriate amount and depth of soil.