Effect of four fertilizing modes (CK, Al, A2 , A3) on bio-mass,sugar contents and the activities of sucrose-metabolizing enzymes of two sweet sorghum varieties(XT-2 & T601)were researched by using field experiment. Result showed: (l)The fertilizing modes had not an effect on growing days. The bio-mass of XT-2 in topdressing treatment A3 with N,P,K fertilizer was the highest,it was 54 916. 96 kg/hm2 ,the bio-mass of T601 in full base P,K fertilizer treatment Al was the highest,it was 64 136. 60 kg/hm2 ,their yield increasing rates to CK were 14. 96%, 10. 48% , respectively. (2)The changing trends of total sugar content and sucrose content are basically identical. The sugar content in jointing stage was lower,total sugar accumulated the highest value in flag leaf stage. The total sugar content of XT-2 in A3 treatment was the highest,it was 12.7% FW;(3)The effect of fertilizing mode on SPS & SS enzyme activities in stem was very obvious,SPS and SS activities of T601 A3 and XT-2-A1 were the strongest,they were 266. 74,431. 21 mg · g-1 · h-1 , respectively, and significantly different to other treatments. The fertilizing mode significantly increased the bio-mass,the sugar contents and enzyme activities(SS and SPS) of sweet sorghum. By this way the quality and yields were increased effectively.%采用田间试验方法,研究了4种施肥方式(CK、A1、A2、A3)对2个甜高粱品种‘新高粱3号’(XT-2)和‘新高粱9号’(T601)秸秆生物产量、糖分含量和蔗糖代谢相关酶活性的影响.结果表明:(1)施肥方式对2个品种的生育天数没有影响;品种XT-2以氮、磷、钾后移改进作追肥施入处理(A3)的生物产量最高(54 916.96 kg/hm2),而T601以生育前期施入磷、钾肥全部作基肥一次施入处理(A1)的生物产量最高(64 136.60 kg/hm2),两者分别比CK(不施肥)增产14.96％和10.48％.(2)甜高粱秸秆总糖含量与蔗糖含量随生育期变化趋势基本一致,秸秆总糖含量在拔节期很低,其基本从挑旗期开始积累,并于成熟期达到最高值,且以XT-2品种在A3处理下的总糖含量最高(达到鲜基重12.7％).(3)施肥方式对甜高粱秸秆蔗糖磷酸合成酶合成酶(SPS)和蔗糖合成酶(SS)活性的影响很明显,并以品种T601在A3处理下的SS活性最高(266.74 mg·g[1·h-1)、品种XT-2在A1处理下的SPS活性最高(431.21 mg·g[1·h-1),且二者均与其他处理差异极显著.研究发现,适宜施肥方式能显著提高甜高粱秸秆的生物产量、糖分含量和蔗糖代谢相关酶(SS、SPS)活性,从而有效改善甜高粱品质,增加其产量.
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