scholarly journals Productivity of switchgrass (Panicum virgatum L.) agrophytocenoses for long-term use

2021 ◽  
Author(s):  
S. M. Mandrovska
Keyword(s):  
Panicum Virgatum ◽  
Biomass Yield ◽  
Control Treatment ◽  
Energy Yield ◽  
Energy Equivalent ◽  
Panicum Virgatum L ◽  
Solid Biofuel ◽  
Experimental Treatments ◽  
The Cost

Purpose. To determene the productivity of switchgrass (Panicum virgatum L.) agrophytocenoses under the long-term use. Methods. Field, statistical, calculation and comparative. Results. During long-term switchgrass cultivation, the lowest yield was obtained in the first vegetation year: 19.7 t/ha in the control treatment, 25.3 and 17.5 t/ha in the experimental treatments. The average raw biomass yield was as following: 30.3 t/ha in the control (variety ‘Cave-in-Rock’), 32.6 t/ha and 26.5 t/ha in the experimental treatments (varieties ‘Kanlow’ and ‘Morozko’, respectively). The yield of solid biofuel (17.3 t/ha) indicates the advantage of ‘Kanlow’ over the control (11.7 t/ha). The lowest yield (15.7 t/ha) was obtained from ‘Morozko’ variety. The energy yield over the treatments: 312.8 GJ/ha in the control, 397.5 and 367.2 GJ/ha in the experimental treatments, respectively. The cost of the grown production was as following: 416.03 UAH/t in the control (‘Cave-in-Rock’), 312.01 UAH/t in ‘Kanlow’, and 366.42 UAH/t in ‘Morozko’. The profitability of the control (‘Cave-in-Rock’) was 69.5%, ‘Kanlow’ – 101.4%, ‘Morozko’ – 66.8%. Economic evaluation of the productivity of switchgrass agrophytocenoses resulted in the following ranking: ‘Kanlow’, ‘Cave-in-Rock’, ‘Morozko’. When analyzing the energy equivalent of switchgrass biomass production and energy consumption, it was found that ‘Kanlow’ yielded 588.8 GJ/ha and the control – 468.3 GJ/ha, which is lower by 120.5 GJ/ha. Conclusions. The yield of switchgrass agrophytocenoses on average over the years of research (2014–2019) was 30.3 t/ha in ‘Cave-in-Rock’ (the control), 32.6 t/ha in ‘Kanlow’, and 26.5 t/ha in ‘Morozko’. The energy equivalent of the obtained yield was 468.3 GJ/ha in ‘Cave-in-Rock’ and 588.8 GJ/ha in ‘Kanlow’, which is by 120.5 GJ/ha higher than in the control.

scholarly journals Long-Term Productivity of Thirteen Lowland and Upland Switchgrass Ecotypes in the Mediterranean Region

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 923
Author(s):  
Efthymia Alexopoulou ◽  
Federica Zanetti ◽  
Eleni G. Papazoglou ◽  
Konstantinos Iordanoglou ◽  
Andrea Monti
Keyword(s):  
Panicum Virgatum ◽  
Mediterranean Climate ◽  
Biomass Crop ◽  
The North ◽  
Panicum Virgatum L ◽  
The Usa ◽  
Biomass Yields ◽  
The Mediterranean ◽  
Marginal Soil

Switchgrass (Panicum virgatum L.) has been identified in the USA as an ideal biomass crop, in relation to its wide environmental suitability, mainly linked to the availability of both upland and lowland ecotypes, allowing the possibility of growing this species in most of the North American region. Switchgrass is conventionally grown for forage, but more recently, it has been considered as a model biofuel crop. Early European studies on switchgrass as a bioenergy crop started in the late 1990s, when a multi-location field trial was established in Greece (Aliartos) and Italy (Ozzano) to compare the productivity of 13 switchgrass genotypes, including upland (Carthage, Blackwell, Caddo, CIR, Forestburg, SU 94-1, Summer) and lowland (Alamo, Kanlow, Pangburn, SL 93-2, SL 93-3, SL94-1) genotypes. The scope was to identify the most suitable ecotype within each environment and, possibly, the best performing variety. The trials lasted 17 years (1998–2014) in Greece and 13 years (1998–2010) in Italy. While in Italy the trial was rainfed and unfertilized, in Greece, where the soil was marginal, drip irrigation was always applied, and the plots were fertilized regularly. The biomass yields in Greece, as averages across the 17 years, were similar for the lowland and upland varieties (11.5 vs. 11.1 Mg ha−1, respectively), while in Italy, as averages across the 13 years, the differences were relevant: 15.4 vs. 11.3 Mg ha−1 for lowland and upland, respectively. Alamo (lowland) was the most productive variety, both in Greece and Italy, with average annual yields of 12.7 and 16.6 Mg ha−1, respectively; CIR in Greece (10.1 Mg ha−1) and Forestburg in Italy (9.1 Mg ha−1) (both upland) were the least productive genotypes. The present results demonstrate the good suitability of switchgrass as biomass crop for the Mediterranean climate. Despite the very marginal soil (i.e., very shallow and with a sandy texture) in the Greek trial, the application of regular fertilization and irrigation produced biomass yields above 11 Mg ha−1 (grand mean) in the present 17-year-long study.

Long-Term Study on the Cost-Effectiveness of Dust Control and Untreated Aggregate-Surfaced Resource Roads

2019 ◽  
Vol 2673 (12) ◽  
pp. 710-716
Author(s):  
Glen Légère ◽  
Allan Bradley
Keyword(s):  
Cost Effectiveness ◽  
Cost Savings ◽  
Condition Index ◽  
Dust Control ◽  
Control Treatment ◽  
Term Study ◽  
Long Term Study ◽  
Crushed Aggregate ◽  
The Cost

A long-term study of treated and untreated aggregate resource roads in Canada was conducted. The objective was to investigate the cost-effectiveness of annual dust control treatments where the hypothesis is that annual applications may prolong aggregate life. Seven sections along two road segments with different traffic levels were studied over five years. A survey of road users revealed that 88% agreed that the treated sections were safer because of the increase in visibility and quicker dust settlement times. Evaluation of surface aggregate indicated some aggregate wear but there were no significant differences between treated and untreated sections. The source and quality of crushed aggregate has an impact on road performance. The condition of the running surface did not indicate any major performance differences between the treated and untreated sections. Regardless of treatment, age, or aggregate sources, a general downward trend in Unsurfaced Road Condition Index was observed, indicating wearing course degradation over time. The study revealed a strong correlation between traffic volume and maintenance intensity. Moderately higher travel speeds were measured on the treated versus untreated sections. When the cost of treatment and maintenance was compared with historical costs, the dust control scenario was more expensive. However, when log hauling cost savings from increased travel speeds were introduced, the dust control was approximately cost neutral in low traffic scenarios and moderately better for high traffic. If non-quantifiable benefits, such as increased safety, were to be considered, application of dust control treatment is recommended.

Variation among Half-Sib Families and Heritability for Biomass Yield and Other Traits in Lowland Switchgrass (Panicum virgatum L.)

Crop Science ◽  
2010 ◽  
Vol 50 (6) ◽  
pp. 2355-2363 ◽  
Author(s):  
H. S. Bhandari ◽  
M. C. Saha ◽  
P. N. Mascia ◽  
V. A. Fasoula ◽  
J. H. Bouton
Keyword(s):  
Panicum Virgatum ◽  
Biomass Yield ◽  
Panicum Virgatum L ◽  
Sib Families

Light interception, use-efficiency and energy yield of switchgrass (Panicum virgatum L.) grown in a short season area

1998 ◽  
Vol 15 (6) ◽  
pp. 475-482 ◽  
Author(s):  
I.C Madakadze ◽  
K Stewart ◽  
P.R Peterson ◽  
B.E Coulman ◽  
R Samson ◽  
...  
Keyword(s):  
Panicum Virgatum ◽  
Light Interception ◽  
Energy Yield ◽  
Panicum Virgatum L ◽  
Use Efficiency ◽  
Short Season

Variance components and heritability of biomass yield in switchgrass (Panicum virgatum L.) grown in the Southern Great Plains

2014 ◽  
Vol 168 ◽  
pp. 148-155 ◽  
Author(s):  
Qingzhen Jiang ◽  
Stephen L. Webb ◽  
Charles R. Yesudas ◽  
Hem S. Bhandari ◽  
Brindha Narasimhamoorthy ◽  
...  
Keyword(s):  
Great Plains ◽  
Variance Components ◽  
Panicum Virgatum ◽  
Biomass Yield ◽  
Southern Great Plains ◽  
Panicum Virgatum L
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