为明确氮肥配施硫酸锰对隆子黑青稞光合特性的影响程度,用LI-6400光合仪对隆子黑青稞旗叶的光合作用进行了测定,结果表明,与不施尿素(对照)和常规施氮处理相比较,缓释尿素处理可以提高黑青稞旗叶的净光合速率、气孔导度、胞间CO2浓度、蒸腾速率、叶绿素SPAD值以及叶面积,配施硫酸锰后能进一步提高其光合性能;在减氮20%条件下,黑青稞光合性能呈下降趋势,但配施硫酸锰时其光合性能呈上升趋势,说明氮肥配施硫酸锰具有协同增效作用.综合来看,CN80%+Mn即235.5 kg/hm2缓释尿素配施22.5 kg/hm2硫酸锰的施肥处理,隆子黑青稞旗叶光合作用的各项指标表现最优.
In order to determine the effect of nitrogen fertilizer combined with manganese sulfate on the photosynthetic characteristics of black barley,the photosynthesis of flag leaves of black barley was measured using LI-6400 photosynthetic apparatus.The results indicated that,compared to the control group without urea and the conventional nitrogen treatment,the application of slow-release urea led to an increase in the net photosynthetic rate,stomatal conductance,intercellular CO2 concentration,transpiration rate,chlorophyll SPAD value,and leaf area in flag leaves of black barley.Furthermore,the addition of manganese sulfate further enhanced the photosynthetic performance.Under conditions of a 20%reduction in nitrogen application,the photosynthetic performance of black barley exhibited a declining trend.However,when combined with manganese sulfate,the photosynthetic performance displayed an upward trajectory,indicating a synergistic effect between nitrogen fertilizer and manganese sulfate.In summary,the CN80%+ Mn treatment,which involved the application of 235.5 kg/hm2 of slow-release urea and 22.5 kg/hm2 of manganese sulfate,yielded the most favorable outcomes for various photosynthetic parameters in flag leaves of highland barley.