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Water use and biomass yield of bioenergy crops in the North Carolina Piedmont
Agronomy Journal ( IF 2.1 ) Pub Date : 2021-03-07 , DOI: 10.1002/agj2.20646
Thomas D. Stephenson 1 , Henrique D. R. Carvalho 2 , Miguel S. Castillo 2 , Carl R. Crozier 2 , Thomas J. Smyth 2 , Joshua L. Heitman 2
Affiliation  

Crops grown for bioenergy purposes are a potential alternative to traditional row crops and pasture–hay systems in the North Carolina (NC) Piedmont, but there is limited information available about their biomass yields and water requirements in this region. The goal of this study was to evaluate biomass yield and water-use efficiency of switchgrass (Panicum virgatum L.), giant miscanthus (Miscanthus × giganteus Greef et Deu.), biomass sorghum (Sorghum bicolor spp.), silage corn (Zea mays L.) and tall fescue (Lolium arundinacea Schreb.). The perennial systems were established in 2012 while annuals were planted each spring. Crop water use was evaluated for the 2016 and 2017 growing seasons using a water balance approach. Giant miscanthus had the highest 2-yr average biomass yield (29.1 ± 0.8 Mg ha–1) followed by corn (23.6 ± 0.6 Mg ha–1) and biomass sorghum (22.0 ± 1.8 Mg ha–1). Switchgrass and tall fescue had the lowest biomass yields, 14.2 ± 1.9 and 12.5 ± 1.2 Mg ha–1, respectively. Fescue had the highest season-long water use in both years of the study. Perennial grasses giant miscanthus and switchgrass had similar seasonal water use, but giant miscanthus had higher water-use efficiency due to greater biomass yields. The annual crops corn and sorghum used less water than the perennial systems because of their shorter growing season, and, consequently, had higher water-use efficiencies. This information can aid growers when making management decisions about converting land into bioenergy crops.

中文翻译:

北卡罗来纳山麓生物能源作物的用水量和生物质产量

在北卡罗来纳 (NC) 皮埃蒙特,以生物能源为目的种植的作物是传统中耕作物和牧场-干草系统的潜在替代品,但关于该地区生物质产量和水需求的信息有限。本研究的目的是评估柳枝稷 ( Panicum virgatum L.)、巨型芒草 ( Miscanthus × giganteus Greef et Deu.)、生物质高粱 ( Sorghum bicolor spp.)、青贮玉米 ( Zea mays ) 的生物质产量和水分利用效率L.) 和高羊茅 ( Lolium arundinacea施雷布。)。多年生系统建立于 2012 年,而每年春天种植一年生植物。使用水平衡方法对 2016 年和 2017 年生长季节的作物用水进行了评估。巨型芒草的 2 年平均生物量产量最高(29.1 ± 0.8 Mg ha –1),其次是玉米(23.6 ± 0.6 Mg ha –1)和生物量高粱(22.0 ± 1.8 Mg ha –1)。柳枝稷和高羊茅的生物量产量最低,分别为 14.2 ± 1.9 和 12.5 ± 1.2 Mg ha –1, 分别。在研究的两年中,羊茅的季节性用水量最高。多年生禾本科芒草和柳枝稷具有相似的季节性用水量,但由于生物质产量更高,巨型芒草的用水效率更高。一年生作物玉米和高粱比多年生作物使用更少的水,因为它们的生长季节较短,因此具有更高的用水效率。这些信息可以帮助种植者做出将土地转化为生物能源作物的管理决策。
更新日期:2021-03-07
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