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Intra-species variations in yield and quality determinants in Vicia species: 1. Bitter vetch (Vicia ervilia L.)

Larbi, A., Abd El-Moneim, A.M., Nakkoul, H., Jammal, B., Hassan, S.
Animal feed science and technology 2011 v.165 no.3-4 pp. 278-287
Vicia, acid detergent fiber, crops, crude protein, digestibility, flowering, grain yield, harvest index, hay, neutral detergent fiber, organic matter, straw, Syria
Variations in days to flowering and pod maturity, harvest index, as well as yields of hay, grain, and straw among 25 bitter vetch (Vicia ervilia L.) accessions were examined over four cropping seasons in a non-tropical dryland environment in north-west Syria. Crops were harvested at flowering to determine hay yield, and at maturity to determine grain and straw yields. Concentrations of hay and straw crude protein (CP), acid detergent fibre (ADFom), neutral detergent fibre (aNDFom), in vitro organic matter (OM) digestibility, and grain CP were analyzed. Days to flowering and pod maturity, harvest index (0.26–0.35), as well as yields (kgDM/ha) of hay, (2738–3435), straw (3408–4033), and grain (1285–1959) varied (P<0.05) among accessions. Concentrations (g/kg DM) of hay CP (146–178), ADFom (200–230), aNDFom (335–395), and IVOMD (742–777g/kg OM); straw CP (82–120), ADFom (282–321), aNDFom (464–508) and IVOMD (483–591g/kg OM); and grain CP (273–285) also varied (P<0.05) among accessions. Grain yield was correlated with days to flowering (r=−0.83, P<0.001; YGᵣₐᵢₙyᵢₑₗd=5976.38–45.75Dₐyₜₒfₗₒwₑᵣᵢₙg, r²=0.69), and harvest index (r=0.90, P<0.001; YGᵣₐᵢₙyᵢₑₗd=69.41Hₐᵣᵥₑₛₜᵢₙdₑₓ−495.78, r²=0.81). Straw CP was correlated with ADFom (r=−0.78, P<0.01; YSₜᵣₐwADFₒₘ=374.42−0.738SₜᵣₐwCP, r²=0.59,) and IVOMD (r=0.87, P<0.001; YSₜᵣₐwIVOMD=269.47+2.78SₜᵣₐwCP, r²=0.76), while straw IVOMD was correlated with ADFom (r=−0.79, P<0.01; YSₜᵣₐwIVOMD=1333.64−2.64SₜᵣₐwADFₒₘ, r²=0.53). Results provide quantitative data on intra-species variations in phenology, as well as yields and quality determinants of hay, grain, and straw in bitter vetch, and demonstrated that yields and quality of hay, grain and straw can be used to identify promising bitter vetch accessions. Accessions 508, 2510, 2511, 2514, 2515, 2517, 2519, 2520 and 2522, have better potential for hay and grain production in non-tropical dry areas.