摘要
为明确宽幅精播条件下冬小麦高产高效的适宜施氮量,于 2020-2022 年在山东省兖州小麦试验站进行田间试验,供试品种为济麦 22.在宽幅精播条件下,设置 5个处理,分别为不施氮(N0)、施氮 150 kg hm-2(N1)、180 kg hm-2(N2)、210 kg hm-2(N3)、240 kg hm-2(N4),研究施氮量对冬小麦耗水特性、旗叶衰老特性、荧光特性和籽粒产量的影响.结果表明,N2 处理显著增加了 60～120 cm土层土壤水分的吸收利用,与N3 和N4 处理相比,N2 处理有效减少了开花前无效分蘖的水分消耗,降低了总耗水量.N2 处理开花后日耗水量高,显著增加了旗叶抗氧化酶活性,其开花后 14～28 d旗叶荧光参数显著高于其他处理.N2 和N3 处理籽粒产量和水分利用效率显著高于其他处理,但N2 处理氮肥农学效率最高,较N1、N3、N4 处理分别高 6.88%、10.60%、45.37%(2020-2021 年)和 7.03%、13.56%、43.71%(2021-2022 年).综上所述,施氮 180 kg hm-2 处理可提高冬小麦对深层土壤水分的吸收利用,增加开花至成熟期阶段耗水量,延缓旗叶衰老,提高籽粒产量与水氮利用效率,是本试验条件下的最优处理.
Abstract
In order to clarify the optimal nitrogen application rate for sustainable and efficient utilization of water and nitrogen under wide width sowing,a field experiments were conducted at the Wheat Experiment Station in Yanzhou,Shandong pro-vince,during the growth period of 2020-2022,and using the variety Jimai 22 as the experimental material.The effects of ni-trogen application on water consumption characteristics,flag leaf senescence and fluorescence characteristics,and grain yield of winter wheat were investigated by five treatments including no N(N0),150(N1),180(N2),210(N3),and 240(N4)kg N hm-2,under wide width sowing.The results showed that the N2 treatment significantly increased the absorption and utilization of soil water in the 60-120 cm soil layer.Compared with N3 and N4 treatments,the N2 treatment effectively reduced the water consumption of ineffective tillers before anthesis and reduced the total water consumption.The high daily water consumption after anthesis in the N2 treatment significantly increased the antioxidant enzyme activities of the flag leaf,and its fluorescence parameters of the flag leaf were significantly higher than those of the other treatments from 14 to 28 days after anthesis.Grain yield and water use efficiency of N2 and N3 treatments were significantly higher than those of the other treatments,while N2 treatment had the highest nitrogen fertilizer agronomic efficiency,which was 6.88%,10.60%,and 45.37%(2020-2021)and 7.03%,13.56%,and 43.71%(2021-2022)higher than N1,N3,and N4 treatments,respectively.In conclusion,the N2 treat-ment can improve the absorption and utilization of deep soil water of winter wheat,increase the water consumption from an-thesis to maturity,delay the senescence of flag leaves,and improve grain yield and water and nitrogen use efficiency,which is the optimal treatment under this experiment.
基金项目
国家自然科学基金项目(32172114)
财政部和农业农村部国家现代农业产业技术体系建设专项(CARS-03)
泰山学者工程专项经费资助()
国家科技期刊平台
NSTL
万方数据