氮素水平对马铃薯干物质积累及库活性的影响

摘要

Field plot experiments were conducted to study the effects of nitrogen rate on dry matter accumulation and sink activity of potatoes using 'Kexin 1' as the material, aiming at finding the optimal nitrogen application rate in the potato production region north of the Yinshan Mountain. Under local soil fertility conditions, the dry matter accumulation and sink activity of potato al increased firstly, and then decreased with the increase of nitrogen application rate. The dry matter accumulation, leaf dry matter accumulation, tuber dry matter accumulation and sink activity of potatoes were maximal when nitrogen was applied at the rate of 360 kg/ha, being 5 989.81 kg/ha, 20.03 g/plant, 84.32 g/plant, and 0.072 g/g⋅d, respectively. Therefore, nitrogen 360 kg/ha would be regarded as the optimal nitrogen application rate for local potato production.%为了探讨内蒙古阴山以北地区马铃薯生产中氮肥适宜施用量，以‘克新1号’品种为材料，采用田间小区试验的方法，研究了氮素水平对马铃薯干物质积累及库活性的影响。结果表明：在当地土壤肥力条件下，马铃薯干物质积累量与库活性均表现出随施氮量的增加呈先增加后降低的趋势。在360 kg/hm2施氮量下，马铃薯公顷干物质积累量、单株叶片干物质积累量、单株块茎干物质积累量和库活性均最大，分别为5989.81 kg/hm2、20.03 g/株、84.32 g/株、0.072 g/g·d。因此，360 kg/hm2的施氮量，可以作为当地马铃薯生产中的最佳氮肥施用量。