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为探索氮素形态对盐碱地棉苗生长及养分吸收的影响,以鲁棉研28号为试验材料,利用嫁接建立的分根试验系统模拟盐分差异分布,研究了根区盐分差异分布和不同形态氮素(NH4+和NO3-)对棉苗生长和主要营养元素吸收的影响。结果表明:根区盐分差异分布和氮素形态对棉花营养元素吸收及幼苗生长存在互作效应;根区盐分差异分布较均匀分布增强了棉株对主要营养元素(N、P、K、Ca、Mg、Fe、Mn、Cu和Zn)的吸收、降低了Na+含量、提高了叶片净光合速率(17.1%)并增加了棉株生物积累量(18.5%);NO3--N较NH4+-N处理显著促进了棉苗主要营养元素(N、P、K、Mg、Fe、Mn)的吸收及生物量积累;根区盐分差异分布下,施用NO3--N较NH4+-N提高了棉苗主要营养元素的吸收及叶片光合速率(13.5%)、降低了各器官的Na+含量并促进了棉苗的生物量积累(7.2%)。研究结论是盐分差异分布下,施NO3--N较NH4+-N更有利于棉花主要营养元素的吸收及幼苗生长。
In order to explore the effect of nitrogen forms on the growth and nutrient uptake of cotton seedlings grown in saline-alkali soil, salt stress distributions were simulated by using root-shoot test system established by grafting. The effects of different salt forms Effects of Nitrogen (NH4 + and NO3-) on Cotton Seedling Growth and Main Nutrient Element Absorption. The results showed that there was an interaction effect of salt distribution and nitrogen forms in root zone on nutrient absorption and seedling growth of cotton. The more uniform distribution of salt content in root zone enhanced the effects of different nutrient elements (N, P, K, Ca, Mg, Fe, Mn, Cu and Zn), decreased Na + content, increased leaf net photosynthetic rate (17.1%) and increased cotton biomass (18.5%); Significantly increased the absorption and biomass accumulation of main nutrient elements (N, P, K, Mg, Fe and Mn) in cotton seedlings. Under the difference of salt content in root zone, Absorption of elements and leaf photosynthetic rate (13.5%) decreased Na + content in all organs and promoted biomass accumulation (7.2%). The conclusion is that the application of NO3 - N is more beneficial to the absorption of main nutrient elements and the growth of seedlings than that of NH4 + -N under salt difference distribution.