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以克新13脱毒原种为试验材料,采用小区试验方法,在150kg N/hm2用量条件下,研究了不同追氮时期对马铃薯钾积累、分配及收获期块茎级别的影响。结果表明,马铃薯各器官含钾量始终表现为地上茎>块茎>叶片。与氮肥全部做基肥相比,将1/3氮肥在块茎形成末期追施,可显著提高收获期块茎中钾的积累量(11.8%)及分配比例(22.3%),同时通过增加商品薯的数量及平均商品薯重量显著提高商品薯率(P<0.05)。但在基肥不足条件下分施氮肥,或在基肥充足条件下氮肥追施过早,都在不同程度上抑制钾在块茎中的积累和块茎的膨大。
The experiment was conducted in a plot plot test under the condition of 150 kg N / hm2 to study the effects of different nitrogen recovery periods on the accumulation and distribution of potassium in potatoes and tuber grades at the harvest stage. The results showed that the potassium content in all organs of potatoes always showed aboveground stem> tuber> leaf. When topdressing 1/3 of nitrogen fertilizer at the end of tuberization, potassium accumulation (11.8%) and distribution ratio (22.3%) of tubers in harvesting stage were significantly increased compared with that of all nitrogenous fertilizer. At the same time, by increasing the amount of commercial potato And the average commodity potato weight significantly increased the potato product rate (P <0.05). However, under the condition of insufficient basal fertilizer, nitrogen fertilizer was applied or nitrogen fertilizer was prematurely applied under the condition of adequate basal fertilizer, all of which inhibited the accumulation of potassium in tubers and the swelling of tubers to varying degrees.