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在田间试验条件下,以不同鲜食型甘薯为试材,研究了施氮对8个鲜食型甘薯品种产量、氮素积累量和氮效率的影响。结果表明,施氮可提高甘薯地上部生物量,供试的8个甘薯品种薯块产量平均值表现为N90>N0>N135,在3个氮水平下薯块产量相对较高的品种是黄皮苏薯8,较低的品种是济薯21;施氮能提高甘薯整株氮素积累量,但不同鲜食型甘薯品种的薯块氮素积累量对施氮的响应也不尽相同。8个甘薯品种的氮素干物质生产效率、氮素利用效率和氮效率基本表现为随施氮量的增加而减小,而氮素吸收效率的总体趋势是随施氮量的增加先减小后增加。根据研究结果将鲜食型甘薯的氮效率划分为5种类型。
Under the field experiment conditions, different sweet potato varieties were used as materials to study the effects of nitrogen application on the yield, nitrogen accumulation and nitrogen efficiency of eight sweet potato cultivars. The results showed that nitrogen application could increase aboveground biomass of sweet potato. The average yield of eight sweet potato varieties tested showed N90> N0> N135. Under the three nitrogen levels, the varieties with relatively high tuber yield were yellow Suzhu 8 and the lower variety was Jishu 21. Nitrogen application could increase the accumulation of nitrogen in the whole plant of sweet potato, however, the response of N accumulation in different sweetpotato cultivars was not the same. The nitrogen production efficiency, nitrogen use efficiency and nitrogen efficiency of 8 sweet potato cultivars decreased with the increase of nitrogen application rate, while the overall trend of nitrogen absorption efficiency decreased first with the increase of nitrogen application rate After the increase. According to the results, the nitrogen efficiency of fresh-eating sweet potato was divided into five types.