密度和氮肥对‘云大麦12号’产量、农艺性状及光合特性的影响

Effects of Density and Nitrogen Fertilizer on Yield,Agronomic Traits and Photosynthetic Characteristics of ’Yundamai12’

为了解创造全国青稞高产纪录的‘云大麦12号’的最佳种植密度和氮肥施用量,本研究采用两因素随机区组试验设计,探讨了不同密度和施氮量及互作对‘云大麦12号’的产量、农艺性状及光合特性的影响。结果显示,不同密度对产量影响极显著,对农艺性状均没有显著影响;不同施氮量对产量没有显著影响,仅对单株分蘖有极显著影响;不同密度和施氮量对4个光合参数及叶绿素含量均没有显著影响,密氮互作对产量、农艺性状、气孔导度、胞间CO_(2)浓度、蒸腾速率和叶绿素影响均不显著;仅对净光合速率有显著影响;种植密度在8.5×105/hm^(2)、施氮量在112.5 kg/hm^(2)时产量达到最大,这是‘云大麦12号’的高产最优密度和氮肥方案。

In order to understand the optimal planting density and nitrogen fertilizer application amount of barley variety ’Yundamai 12’,a two-factor randomized block experiment was designed to explore the effects of density,nitrogen fertilizer and their interactions on the yield,agronomic traits and photosynthetic parameters of ’Yundamai12’.The results showed that different densities had no significant effect on yield,but no effect on a single plant tiller.There were no significant effects of density and nitrogen application rates on four photosynthetic parameters and chlorophyll content.Dense nitrogen interaction did not affect yield,agronomic traits,stomatal conductance,intercellular CO_(2) concentration,transpiration rate and chlorophyll significantly were not significant,but only had a significant effect on the net photosynthetic rate;the planting density was 8.5 ×105/hm^(2).The yield reached the maximum when the amount of nitrogen was 112.5 kg/hm^(2),which was the optimal density and nitrogen fertilizer scheme for ’Yundamai 12’.