First Harvest Timing and Nitrogen Application Rate Effects on Chemical Composition and Ethanol Yield of Switchgrass

Seepaul, Ramdeo; Macoon, Bisoondat; Reddy, K. Raja; Evans, William B.

doi:10.2134/cftm2015.0163

First Harvest Timing and Nitrogen Application Rate Effects on Chemical Composition and Ethanol Yield of Switchgrass

Journal Article · Tue Jun 14 00:00:00 EDT 2016 · Crop, Forage & Turfgrass Management

DOI:https://doi.org/10.2134/cftm2015.0163· OSTI ID:1591959

Seepaul, Ramdeo ^[1]; Macoon, Bisoondat ^[2]; Reddy, K. Raja ^[3]; Evans, William B. ^[4]

North Florida Research and Extension Center Univ. of Florida 155 Research Rd. Quincy FL 32351
E.G. (Gene) Morrison Brown Loam Branch Experiment Station Mississippi State Univ. 1676 Brown Loam Rd. Raymond MS 39154
Dep. of Plant and Soil Sciences Mississippi State Univ., R.R. Foil Plant Science Research Center Bldg. 32 Mississippi State MS 39762
Truck Crops Branch Experiment Station Mississippi State Univ. 2024 Experiment Station Rd. Crystal Springs MS 39059

Switchgrass ( Panicum virgatum L.) chemical composition dynamics must be evaluated if dual‐purpose use as both forage and feedstock is to be considered. This 2‐year study, conducted at the Brown Loam Branch Experiment Station, Raymond, MS, quantified first harvest timing (HT) and nitrogen (N) rate effects on forage nutritive value, feedstock chemical composition, and ethanol yield of both primary and aftermath harvests of ‘Alamo’ switchgrass. Treatments were factorial combinations of six HT (monthly intervals from May to October) and four N application rates (0, 35.7, 71.2, and 107.1 lb/acre) in a randomized complete block design. Aftermath was harvested in November. In both years, first harvest acid detergent fiber (ADF), neutral detergent fiber (NDF), lignin, cellulose, and hemicellulose concentrations of aboveground biomass, stems, and leaves increased with HT from May to October while aftermath harvest concentrations decreased with shorter regrowth after the first harvest. Stems had greater concentrations than leaf. Crude protein (CP) and in vitro dry matter digestibility (IVDMD) decreased with plant maturity and were greatest in the leaf component. Concentrations of major sugars increased with maturity and were greatest in the most mature stand in the aftermath. Ethanol yield was greatest in the least mature stands; however, ethanol production increased with maturity, largely because of greater biomass harvested. Nitrogen rate had no effect on forage nutritive value or feedstock composition in either the primary or aftermath harvests. These results provide information that can guide potential utilization of switchgrass as forage in early season and harvesting for biofuel feedstock at the end of the season.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG36-06GO86025

OSTI ID:: 1591959

Journal Information:: Crop, Forage & Turfgrass Management, Journal Name: Crop, Forage & Turfgrass Management Journal Issue: 1 Vol. 2; ISSN 2374-3832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Country unknown/Code not available

Language:: English

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