基于临界氮浓度的啤酒大麦氮素营养诊断模型研究

氮素的盈亏影响啤酒大麦的生长发育、产量形成及酿造品质优劣。因此，啤酒大麦氮素的科学运筹和精确调控，对于发展高产优质的啤酒大麦生产显得尤为重要。本研究以啤酒大麦为研究对象，通过实施不同品种与施氮水平的田间试验，于关键生育期系统测定植株干物重、氮含量、氮积累量、籽粒蛋白质含量及冠层反射光谱，解析植株和穗部氮浓度的动态变化规律，建立临界氮浓度稀释模型；分析临界氮浓度与实际氮浓度之间的关系，建立啤酒大麦氮营养指数；阐明氮营养指数、光谱指数和籽粒蛋白质含量之间的定量关系，构建基于临界氮浓度的啤酒大麦氮素营养诊断模型。研究结果为啤酒大麦氮素营养的实时诊断调控奠定理论基础，对生产优质、高产啤酒大麦具有重要意义。

Profit and loss of nitrogen affects growth and development, yield formation and brewing quality in malting barley. Therefore, the scientific application and precise regulation of nitrogen is particularly important for the production of high yield and high quality in malting barley. In the present study, a series of field experiments will be carried out with different barley varieties and nitrogen application levels. The dry matter of plant, nitrogen concentration, nitrogen accumulation, grain protein content and spectral index of malting barley will be measured systematicly in main growing period. First, the dilution characteristics of plant nitrogen concentration will be defined, and critical nitrogen concentration will be developed. Then, the relationship between the critical nitrogen concentration and the actual nitrogen concentration will be analyzed, and nitrogen nutrition index will be constructed. Last, relationships among nitrogen nutrition index, spectral index and protein content will be illuminated. Diagnostic model based on critical nitrogen concentration in malting barley will be constructed. Expected result will provide the theoretical basis for the diagnosis and regulation of nitrogen nutrition in malting barley, which has important significance in the production of high quality and high yield.