论文部分内容阅读
在大田条件下,以马铃薯品种费乌瑞它为试验材料,研究施氮量(N 0、80、160、240kg/hm2)对冬马铃薯氮素吸收利用和土壤氮含量变化的影响。结果表明,施氮可显著提高马铃薯根、茎、叶及块茎全N含量;施N量在0~160kg/hm2范围,马铃薯茎、叶、块茎及植株全N积累量随施N量的增加而明显增加,但继续增加施N量,茎、块茎及植株全N积累量增加不明显;马铃薯氮肥农学利用率、吸收利用率、偏生产力及氮素块茎生产效率随施N量的增加呈明显下降趋势,氮肥生理利用率和氮素收获指数呈先增加而后降低趋势。马铃薯收获后,施N量为0~80kg/hm2的种植地0~30cm土层碱解氮含量不同程度下降,施N量为160~240kg/hm2的各土层碱解氮含量显著增加,但施N量对土壤全N含量影响不明显。可见,本研究条件下施N量应控制在80~160kg/hm2。
Under the field conditions, the potato variety Fei Wurui was used as experimental material to study the effects of N 0, 80, 160 and 240 kg / hm2 on nitrogen uptake and utilization of winter potato and soil nitrogen content. The results showed that nitrogen application could significantly increase the total N content of roots, stems, leaves and tubers. N rates ranged from 0 to 160 kg / hm2. The N accumulation of stems, leaves, tubers and plants increased with N But the increase of N application rate did not increase the accumulation of N in stems, tubers and plants. The agronomic efficiency, absorption and utilization efficiency, partial yield and tuber yield of potato were decreased obviously with the increase of N application rate The trend of physiological nitrogen use efficiency and nitrogen harvest index first increased and then decreased. After the potato was harvested, the content of available nitrogen in the 0-30cm soil layer decreased from 0 to 80kg / hm2, and the content of alkaline hydrolysis nitrogen in each layer increased from 160kg / h to 240kg / hm2. N application rate had no significant effect on total N content in soil. Can be seen, the amount of N applied in this study should be controlled at 80 ~ 160kg / hm2.