کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
677978 888627 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of genotype, harvest time and chemical composition on the methane yield of winter rye for biogas production
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Impact of genotype, harvest time and chemical composition on the methane yield of winter rye for biogas production
چکیده انگلیسی

Rye (Secale cereale L.) is an ideal crop for the agricultural biogas production in regions with less fertile and sandy soils. Maximum methane yield per hectare is the main aim of the farmer. Objectives were to establish differences by the Hohenheim Biogas Test among (1) 25 genotypes (experiment 1) and (2) three harvest dates (early heading, early and late milk ripening) and three plant fractions (ears, leaves and stems, stubbles) for four genotypes including an analysis of their nutrient composition (experiment 2). Significant (P < 0.05) genotypic variation was found for dry matter yield, specific gas yield and methane yield among the 25 genotypes, but no differences for methane content and specific methane yield. Broad ranges were achieved for dry matter yield (0% water content) and methane yield amounting to 2.9 t ha−1 and 840 m3 ha-1 respectively, combined with moderate to high heritabilities (0.71–0.98). Both traits were highly correlated (r = 0.95, P < 0.01). Compared to population and forage rye, hybrid rye achieved significantly higher methane yields. The latest harvest date at late milk ripening resulted in the highest dry matter yield on a whole plant level with an average of 16.0 t ha−1. Accordingly, methane yield was reaching a mean of 4424 m3 ha-1 and a maximum of 4812 m3 ha-1. No correlations between content of crude nutrients or cell-wall fractions and specific gas or methane yield were evident neither for the plant fractions nor for the whole plant. In conclusion, harvesting at late milk ripening was clearly superior in dry matter and methane yields although specific methane yield was higher at early heading. A selection for maximum dry matter yield in rye breeding should indirectly improve also methane yield.


► Biomass and biogas-related traits of rye genotypes, harvest dates and plant organs.
► Significant genotypic variation for dry matter yield and methane yield.
► High heritabilities (0.8-0.9) for dry matter and methane yield.
► Highest dry matter and methane yield at late milk ripening: 16 t ha−1/4861 m−3 ha−1.
► Selection for dry matter yield indirectly improves methane yield.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biomass and Bioenergy - Volume 35, Issue 10, 15 October 2011, Pages 4316–4323
نویسندگان
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