【摘要】 为了探明适宜的钾肥施用量与施肥时期在提高甘薯产量和品质的同时,实现钾肥的高效利用和优化管理。以优质食用型甘薯徐薯32为试验材料,研究3个钾肥用量(0,150,300 kg/hm2)和3个施钾时期(生长早期即栽插后2周内、封垄期和块根膨大初期)处理对甘薯产量及营养成分的影响。结果表明:生长早期施用钾肥300 kg/hm2时,块根鲜薯和薯干产量获得最高值,分别为36 495.0,12 175.5 kg/hm2。钾肥不同施用期和施用水平对所测甘薯品质性状影响较大,甘薯生长早期追施钾肥有利于淀粉、麦芽糖和蔗糖的积累;低钾处理有利于淀粉及糖类物质的积累,而高钾处理则有利于蛋白质的积累。更多还原

【Abstract】 In order to ascertain the appropriate potassium fertilization level and fertilization period,the field experiments were done to improve the yield and quality of sweetpotato,and its efficient utilization and optimization management at the same time.The effects of three K levels(0,150,300 kg / ha) and three fertilization periods(the early stage of growth period within 2 weeks after planting,sealing ridge stage and the early stage of storage root enlargement) treatment on sweetpotato yield and nutritional composition application on yield and nutritional compositions were studied using edible sweetpotato variety Xushu 32 as experimental material.The results showed that the maximum fresh(36 495.0 kg / ha) and dry(12 175.5 kg / ha) yield were observed under early application of K 300 kg / ha.The impact of K fertilization level and fertilization period on measured quality traits was obvious.Fertilizer application at early stage of growth period was beneficial to starch,maltose and sucrose accumulation.Low potassium level treatment contributed to starch and carbohydrate accumulation,high potassium level treatment contributed to protein accumulation.更多还原