中国油料作物学报2017，Vol.39Issue(2)：204-212,9.DOI:10.7505/j.issn.1007-9084.2017.02.010
铵硝配比对不同芝麻品种苗期生长及养分吸收的影响
Effects of different nitrogen form and ratio on growth and nutrient uptake of different sesame cultivars
摘要
Abstract
To explore the effects of nitrogen form and ammonium/nitrate ratio (NH4 +-N/NO3--N ratio) on growth and nutrient uptake of sesame seedlings,2 sesame cultivars Zhongzhi 13 and Luo 12 were employed in hydroponics with 7 NH4+-N/NO3--N ratio treatments (10∶ 0,9∶ 1,3∶ 1,1∶ 1,1∶ 3,1∶ 9,0∶ 10).pH values of nutrient solution and plant phenotype were regularly measured.Plant biomass,root morphological parameters,and N,P,K,Ca,Mg,free NH4 +-N and NO3--N concentration of leaf and root were determined at the 28th day treatments.Results showed that high NH4 +/NO3-ratios (10∶ 0,9∶ 1,3∶1) inhibited seedling growth with dwarf plants,scorched leaves and stubby roots,and the inhibition increased with NH4 +-N.Cultivar Zhongzhi 13 showed more tolerance to NH4 + toxicity.Under NH4 +-N/NO3--N ratio at 1 ∶ 9,seedlings exhibited the greatest plant biomass,and pH of nutrient solution maintained suitable especially for Zhongzhi 13.Compared with total NO3--N treatment (0∶ 10),plant dry weigh,total root length and root surface area of Zhongzhi 13 were significantly increased 47％,29％ and 15％ respectively.Moreover,appropriate NH4 +-N/NO3--N ratio promoted the absorption and utilization of N,P,K in Zhongzhi 13,as indicated by N,P,K concentrations increase in leaves and roots respectively.However,compared with total NO3--N treatments (0∶ 10),ratio 1∶9 was appropriate with no significant effect on plant biomass and nutrients uptake of Luo 12.Therefore,appropriate NH4 +-N could enhance sesame seedlings biomass and root growth,NH4 +-N/NO3--N ratio of 1 ∶ 9 was more suitable for growth and nutrient uptake of the seedling.It was recommended that NO3--N could be used as a major N source for sesame,and suitable NH4 +-N for specific sesame cultivars and soil was suggested in field.关键词
芝麻(Sesamum indicum L.)/铵硝配比/生物量/根系形态/养分吸收Key words
sesame (Sesamum indicum L.)/ammonium/nitrate ratio (NH4 +-N/NO3--N ratio)/biomass/root morphology/nutrient uptake分类
农业科技引用本文复制引用
徐子先,廖星,秦璐,李银水,韩配配,廖祥生,胡小加,谢立华,余常兵,张秀荣..铵硝配比对不同芝麻品种苗期生长及养分吸收的影响[J].中国油料作物学报,2017,39(2):204-212,9.基金项目
中国农业科学院创新工程-油料所(CAAS-ASTIP-2013-OCRI) （CAAS-ASTIP-2013-OCRI）
杰出青年英才计划项目(1610172015004) （1610172015004）
