Abstract: By analyzing the nutrient contents of cassava in its all growth stages from planting to harvest in Danzhou,Hainan Province,cassava's nutrition characteristic and its most suitable nutrition diagnosis part were studied.The results showed that:(1) The macro element contents of cassava varied with months and with organs,and their average contents in whole cassava plant presented K> N>Ca >Mg> P>S;(2) Leaves were identified as the diagnosis parts of nitrogen,phosphorus,potassium,magnesium and sulphur contents;(3) The ratio of average contents of nutrient elements in cassava plant was N:P:K:Ca:Mg:S=0.89~1.87:0.14~0.27:1.06~1.72:0.54~0.99:0.18~0.32:0.06~0.16;(4) During the stage of reproduction,the contents of N,P,K,Ca,Mg and S of cassava dropped with the increasing of plant age regularly.

Key words: Cassava, nutrition characteristic, nutrition diagnosis

摘要： 通过对海南儋州地区高产木薯‘华南8号’从种植至收获全生长期的养分分析,研究木薯的营养变化规律及适宜营养诊断部位。研究表明:(1)木薯各营养器官及不同月份大量元素的养分含量存在明显差异,全株平均养分含量为:K> N> Ca> Mg> P> S;(2)木薯N、P、K、Mg及S的适宜诊断部位为叶片;(3)全株平均养分含量比例为N:P:K:Ca:Mg:S=0.89~1.87:0.14~0.27:1.06~1.72:0.54~0.99:0.18~0.32:0.06~0.16;(4)生殖生长阶段,随着株龄的增加,木薯N、P、K、Ca、Mg及S的含量均呈规律下降。

关键词: 木薯, 营养规律, 营养诊断