The Late M. Radau

Downing, A. M. W.

doi:10.1038/088414d0

Nature

1912

DOI: 10.1038/088414d0

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The Late M. Radau

A. M. W. Downing¹

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2000

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“…P ublic concern about the environmental impact and the sustainability of our current coal‐ and nuclear‐based electricity production system has prompted the study of renewable biofuels for electricity production (Easterly and Burnham, 1996) The primary biofuels that have been investigated are switchgrass ( Panicum virgatum L.) and hybrid poplar ( Populus spp.) (Downing et al, 1996; Graham et al, 1996). Alfalfa is the primary biofuel source in the Minnesota Agri‐Power (MAP) project proposed by the Minnesota Valley Alfalfa Producers (Wilbur et al, 1998) Alfalfa is a widely grown traditional crop that fits well into a typical crop rotation.…”

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confidence: 99%

Leaf and Stem Properties of Alfalfa Entries

Sheaffer¹,

Martin

Lamb³

et al. 2000

Agronomy Journal

119

105

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In the North Central region, producers typically initiate harvesting when alfalfa maturity reaches bud to early Alfalfa (Medicago sativa L.) has been considered as a biofuel flowering. This often results in three or four harvests feedstock. A system has been proposed to produce electricity from the stems and utilize the leaves as a livestock feed. We determined per season. Harvest maturity is determined by producer the effects of harvest regimes on yield and quality of leaf, stem, and need to optimize herbage yield, nutritive value, or nutritotal herbage of six alfalfa entries. We applied three harvest regimes ent yield. Highest herbage nutritive value and intake involving three harvests per year at bud stage or early flower, or two potential usually occur with preflowering alfalfa with the harvests per year at late flower. An early flower harvest regime had highest yields of nutrients at early flowering (Sheaffer et the highest leaf yield (average of 5.6, 4.5, and 4.5 Mg ha Ϫ1 for the al., 1988). Herbage harvested at full bloom is expected to early flower, late flower, and midbud regimes, respectively), and the have a higher stem proportion than less mature herbage late flower harvest regime had the highest stem yield (average of 5.8, (Fick and Holthausen, 1975; Kilcher and Heinrichs, 5.3, and 3.9 Mg ha Ϫ1 for the late flower, early flower, and midbud 1974). A biofuel production system that adds value to regimes, respectively). Leaf concentration decreased with increased stem components of alfalfa may favor a shift to harvestherbage maturity (average of 540, 517, and 458 g kg Ϫ1 for the midbud, early flower, and late flower regimes, respectively) and was associated ing at more mature stages with fewer harvests per with total herbage crude protein (CP) (r ϭ 0.65, P Ͻ 0.05) and acid-season. detergent fiber (ADF) and neutral-detergent fiber (NDF) (r ϭ Ϫ0.76, Recommended harvest schedules for modern alfalfa P Ͻ 0.05). Harvest regime did not affect total seasonal herbage yield cultivars in a biofuel system are unknown because the or stand persistence. Alfalfa entries differed in herbage quality, leaf relative value of leaf and stem components is expected concentration, and leaf yield, but did not consistently differ in total to vary with energy and livestock feed prices. Compared herbage or stem yield. Herbage yield and quality differences among with the currently used three-or four-cut schedules, a entries were similar for all harvest regimes. Producers can affect stem two-cut schedule with alfalfa harvested at full bloom and leaf yields by selection of harvest regime.

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mentioning

confidence: 99%

Leaf and Stem Properties of Alfalfa Entries

Sheaffer¹,

Martin

Lamb³

et al. 2000

Agronomy Journal

119

105

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The Late M. Radau

Cited by 1 publication

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Leaf and Stem Properties of Alfalfa Entries

Leaf and Stem Properties of Alfalfa Entries

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