Perennial species for optimum production of herbaceous biomass in the Piedmont (Management study, 1987--1991)

Technical Report · Thu Apr 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/6418430· OSTI ID:6418430

Parrish, D J; Wolf, D D; Daniels, W L ^[1]

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1. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Crop and Soil Environmental Sciences

The authors have investigated cutting and N management strategies for two biofuel feedstock candidate species -- switchgrass (Panicum virgatum) and weeping lovegrass (Eragrostis curvula). Each was no-till planted in 1987 at three sites underlain by Davidson or Cecil soils. Three N levels (0, 50, or 100 kg/ha) were applied, and the plots fertilized at each level were harvested either twice (early-September and early-November) or only in early-November. The results with lovegrass suggest 50 kg N/ha is nearly optimal and that two cuttings provide more biomass than one. For switchgrass, when averaged across sites and years, 50 kg N/ha produced a slight yield advantage over no added N, but 50 kg was not different from 100 kg. In 1989 and 1990, more biomass was available in early-September harvests (9.6 Mg/ha) than in early-November (8.3 Mg/ha). Apparently the plants translocated significant portions of their biomass below ground during the last few weeks of the season. In 1991, we harvested only in early-November. Plots that had been cut in early-September in the previous three years had lower yields (7.6 Mg/ha) than those that had been cut only in early-November (9.4 Mg/ha). The delayed cutting permitted more growth on a sustained basis -- presumably because of conservation of translocatable materials. This poses an interesting dilemma for the producer of biomass. In additional studies, the authors found no advantage in double-cropping rye (Secale cereale) with switchgrass; at low input levels, rye yields were low, and rye lowered switchgrass yields. Other studies showed double-cropping with winter-annual legumes such as crimson clover (Trifolium incarnatum) may have potential. The timing of herbicide treatment of the legume is critical.

• Research Organization: Oak Ridge National Lab., TN (United States); Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Crop and Soil Environmental Sciences
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6418430
• Report Number(s): ORNL/Sub-85-27413/7; ON: DE93015359
• Country of Publication: United States
• Language: English

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