tailieunhanh - Root yield and quality of sugarbeet in relation to sowing date, plant population and harvesting date interactions

Sowing date, plant density and harvest date are important factors affecting root yield and quality of sugar beet (Beta vulgaris L.). The effects of sowing date (beginning of April, mid-April, the end of April, mid-May, and the end of May), plant density, and harvest date (the end of September and mid-October) on sugar beet yield and quality were studied in trials in the Eastern Anatolia region on a loam soil in 1994-97. | Turk J Agric For 26 (2002) 133-139 © TÜB‹TAK Root Yield and Quality of Sugarbeet in Relation to Sowing Date, Plant Population and Harvesting Date Interactions Ramazan ÇAKMAKÇI Erzurum fieker Fabrikas›, 25700, Il›ca, Erzurum - TURKEY Erol ORAL University of Manas, Biflkek, KIRGIZISTAN Received: Abstract: Sowing date, plant density and harvest date are important factors affecting root yield and quality of sugar beet (Beta vulgaris L.). The effects of sowing date (beginning of April, mid-April, the end of April, mid-May, and the end of May), plant density, and harvest date (the end of September and mid-October) on sugar beet yield and quality were studied in trials in the Eastern Anatolia region on a loam soil in 1994-97. Variation in plant density was obtained by combining two seed distances and two target emergence percentages. Plant populations for the different treatments reached 55 500, 73 000, 88 900 and 103 600 plants ha-1. Each day that sowing was delayed from mid-April to the end of May resulted in a 703 and 134 kg/ha decrease in root and sugar yield, respectively. A delay in emergence of 43 days from the beginning of May reduced sugar content by and estimated extractable sugar content by . The maximum differences between large and small plant densities were leaf yield , sugar content , estimated extractable sugar content , root yield , and recoverable sugar yield . Sugar beet grown at high densities should be harvested later; whereas, crops at low densities should be harvested at the beginning of the harvesting period. Key Words: Sugar beet, sowing date, harvest date, plant population, root yield- quality Ekim Tarihi, Bitki S›kl›¤› ve Hasat Tarihi ‹nteraksiyonunun fieker Pancar›n›n Verim ve Kalitesi Üzerine Etkisi Özet: Bitki s›kl›¤›, ekim ve hasat tarihi fleker pancar› verim ve kalitesini etkileyen önemli faktörlerdir. Bu çal›flmada Do¤u Anadolu Bölgesinde 1994-97 y›llar›nda t›nl› toprakta ekim tarihi (Nisan