بررسي ويژگيهاي فيزيولوژيك و تكنولوژيك چغندرقند در سطوح مختلف تراكم و كود نيتروژن

Assessment of sugar beet physiologic and technologic characteristics at different plant density and nitrogen use levels

Specific leaf area, plant height and number of green and yellow leaf in each plant are some of the most important morphological characteristics that show plant growth. Different management such as plant densities and nitrogen levels affect these characteristics. A split plot experiment within randomized completely block design with three replications was used in April 2001 and it was located in about 2500 meter square land in Sugar beet Research station in KamalAbad, Karaj. The main plots were sugar beet plant densities (D 1=80000, D2= 100000, D3= 120000 p/ha) and subplots were nitrogen fertilizer in three levels (N0=100, N 1=200, N2=300 kg N/ha). The plots were sampled 11 times during growing season and leaf area, total shoot biomass, plant height, number of green and yellow leaves and sugar and root yield were measured. SI A had descending pattern in growth period and it was amount 8-10.5 meter square per kilogram in different treatment. Effects of plant densities was significant on sugar content and sugar purity at a= 0.05 and the most white sugar content with 99 percent confidence was related to 80000 plant in each hectare. A significant effect of nitrogen was observed on plant height, root potassium (a= 0.05) and sugar beet root sodium (a= 0.01). Shoot height and root sodium was increased at the most nitrogen level and increasing soil nitrogen decreased root potassium.