Dry matter accumulation and forage quality characteristics of different soybean genotypes

Authors : Esvet AÇIKGÖZ, Mehmet SİNCİK, Gary WIETGREFE, Mustafa SÜRMEN, Semiha ÇEÇEN

Pages : 22-32

Doi:10.3906/tar-1204-58

View : 14 | Download : 6

Publication Date : 2013-02-01

Article Type : Research Paper

Abstract :Three different soybean [Glycine max insert ignore into journalissuearticles values(L.); Merr.] cultivars insert ignore into journalissuearticles values(A-3127, Derry, and Yemsoy); were evaluated for dry matter insert ignore into journalissuearticles values(DM); yield, plant components, and crop growth rate insert ignore into journalissuearticles values(CGR); at different row spacings and harvesting stages in 3 locations with Mediterranean-type climate in a split-split plot design with 3 replications in 2009 and 2010. In addition, crude protein insert ignore into journalissuearticles values(CP);, crude protein yield insert ignore into journalissuearticles values(CPY);, acid detergent fiber insert ignore into journalissuearticles values(ADF);, neutral detergent fiber insert ignore into journalissuearticles values(NDF);, total digestible nutrients insert ignore into journalissuearticles values(TDN);, and relative feed value insert ignore into journalissuearticles values(RFV); of harvested forage soybeans were determined at the Bursa insert ignore into journalissuearticles values(Turkey); location. Increased row spacings significantly reduced DM yield at all locations. Combined over other main effects, the 25-cm row spacing produced 35% more DM yield than the 75-cm row spacing. Row spacings greatly affected DM yield at the R5 and particularly the R7 stage, but this effect was minimal at the R1 stage. The forage-type cultivar Derry produced significantly higher DM yield in all locations, particularly at the R5 and R7 stages. The constituent components of DM were similar at different row spacings of soybean cultivars. In general, the CGR decreased from 25-cm row spacing to 75-cm row spacing in all locations, and the CGR of the cultivars varied significantly according to harvest period, row spacing, and location. Derry had a significantly higher CGR than the other cultivars in the Antalya and Bursa locations. Quality characteristics of soybean forage were not significantly affected by row spacing and showed little effect by cultivar. Harvest stage significantly affected CP, ADF, NDF, TDN, and RFV concentrations of soybean forage. It was concluded that in Mediterranean environments forage-type soybeans insert ignore into journalissuearticles values(i.e. Derry); can be seeded in narrow rows insert ignore into journalissuearticles values(25 cm); at high plant population insert ignore into journalissuearticles values(100 kg ha-1); and offer the most DM yield when harvested at later R stages insert ignore into journalissuearticles values(e.g., R7); rather than at the early reproductive stage.
Keywords : Key words Glycine max L, Merr, row spacing, harvest stage, chemical composition, crop growth rate