The effects of slow-released fertilizer on morphological indexes , yield and economic benefit of yam tubers were studied using Japanese yam as test material .With the treatment without fertilizer as con-trol, two treatments were set as slow -released fertilizer and fast -released fertilizer with the same nutrient content .The results showed that there were significant differences between fast -released fertilizer and slow -released fertilizer in morphological indexes and yield of yam tubers .The slow -released fertilizer treatment could significantly increase the tuber length , tuber diameter , rate of marketable tuber and yield;the effect was the best when using 200 kg of slow -released fertilizer per 666.7m2; the yield increased by 44.95% and 25.80%compared with the control and fast -release fertilizer;the net income was 16 604.81yuan per 666.7m2 , which was 87 .82%higher than that of control and 57 .39%higher than that of fast -released fertilizer .%以大和长芋为试材，分别设两组等养分含量的缓释肥与速效肥处理，以不施化肥为对照，研究缓释肥对山药块茎形态指标、产量和经济效益的影响。结果表明：等养分含量的缓释肥与速效肥处理对山药块茎形态指标和产量的影响存在显著差异，缓释肥处理比速效肥处理能显著增加山药块茎长、块茎粗、商品薯率和产量，其中以每666．7m2施用缓释肥200 kg的处理效果最好，产量比对照增加44．95％，比等养分的速效肥处理高25．80％；纯收益为16604．81元，比对照高87．82％，比等养分含量速效肥处理高57．39％。
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