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以“宝石”甘薯为试材,通过两个生长季节在沙质壤土上对3种氮肥、3种钾施用量和2种氮施用量进行了评价。氮肥种类对甘薯产量没有影响,然而NaNO_3与NH_4NO_3或Ca(NO_3)_2相比,显著地使叶片和薯块中Na的含量增加。每公顷140公斤钾和101公斤氮处理的产量,分别超过每公顷70或280公斤钾和每公顷202公斤氮处理的。全叶和薯块中矿物质的含量充足。块根中氮、磷、钙、镁的浓度比叶片组织中的低。
Using “gem” sweetpotato as test material, three nitrogenous fertilizers, three potassium fertilizers and two nitrogen fertilizers were evaluated on sandy loam in two growing seasons. The type of nitrogen fertilizer has no effect on the yield of sweet potato, however NaNO 3 significantly increases the content of Na in leaves and tubers as compared with NH 4 NO 3 or Ca (NO 3) 2. Production of 140 kg potassium and 101 kg nitrogen per hectare exceeds 70 or 280 kg potassium per hectare and 202 kg nitrogen nitrogen per hectare, respectively. Full leaf and tubers are rich in minerals. The concentration of nitrogen, phosphorus, calcium and magnesium in root tuber was lower than that in leaf tissue.