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Relation between nitrogen nutrition index and production of spring malting barley | ||
| International Journal of Plant Production | ||
| مقاله 4، دوره 11، شماره 3، شهریور 2017، صفحه 379-388 اصل مقاله (210.23 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22069/ijpp.2017.3546 | ||
| نویسندگان | ||
| O. Sedlář* ؛ J. Balík؛ J. Černý؛ M. Kulhánek؛ F. Vašák | ||
| Department of Agro-Environmental Chemistry and Plant Nutrition, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Praha 6 - Suchdol, Czech Republic. | ||
| چکیده | ||
| Although the nitrogen nutrition index (NNI) is a widely used indicator of plant nitrogen status, no model of NNI calculation for spring barley (Hordeum vulgare) reflecting also specific malting requirements on grain has been published. The aim of this study was to determine an optimal range of the nitrogen nutrition index (ratio of nitrogen concentration in shoot biomass to critical nitrogen concentration) with respect to optimal grain protein content (N × 6.25 = 9.0 – 11.5 %), plump grain (grain > 2.5 mm) yield and lodging of spring malting barley during 7-year (2007 – 2013) strict field experiments realized under the conditions of three experimental sites in the Czech Republic. A dose of 80 kg N/ha and 130 kg N/ha, respectively, was applied in mineral fertilizers. The nitrogen nutrition index was determined at the BBCH 30 (beginning of stem elongation) and BBCH 45 (late boot stage) growth stages. The most suitable indicators for evaluation of the nitrogen concentration in shoot biomass of the spring malting barley in our experiments proved to be Justes et al.´s model Nc = 5.35 DM(-0.442) designated for winter wheat and Zhao´s model Nc = 4.76 DM(-0.39) designated for winter barley, where DM is shoot dry matter in t/ha. The nitrogen nutrition index for spring malting barley should not exceed a value of NNI = 0.80 and NNI = 0.90 using the Justes et al.´s model and the Zhao´s one during the BBCH 30 – 45 growth stages. | ||
| کلیدواژه‌ها | ||
| Dilution curve؛ Lodging؛ Plumpness؛ Protein content؛ quality؛ Yield | ||
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