Production of sweet sorghum (Sorghum bicolor L. Moench) increases with increased plant densities and nitrogen fertilizer levels


Turgut İ., Bilgili U., Duman A., Acikgoz E.

ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE, vol.55, no.3, pp.236-240, 2005 (SCI-Expanded) identifier identifier

Abstract

The main aim of this study was to evaluate the effects of different intra-row spacings and nitrogen levels on forage, dry matter, seed yield and some other yield components of sweet sorghum ( Sorghum bicolor L. Moench). Five intra-row spacings ( 5, 10, 15, 20 and 25 cm) and five N fertilization rates ( 0, 50, 100, 150 and 200 kg ha(-1)) were tested under irrigated conditions in Bursa, Turkey in 2002 and 2003 growing seasons. Yields decreased with increasing intra-row spacing, and increased up to 100 kg N ha-(1). Five- or 10 cm intra-row spacings and 100 kg N ha(-1) fertilization gave more than 80 tonnes ( t) ha(-1) forage or 30 t ha(-1) dry matter yield based on pooled data of both years. The two-year average seed yield ranged from 3.15 to 4.53 t ha(-1), with the highest yield being obtained from the combination of 10 - 20 cm intra-row spacing and 150 kg N ha(-1). Five- or 10-cm intra-row spacings, and 100 or 150 kg ha(-1) N fertilization regimes are suggested to maximize forage, dry matter and seed yield in sweet sorghum under similar soil and climatic conditions.