مطالعه تعداد برگ هاي فعال و غيرفعال ، ديناميك تشكيل آن ها و شاخص سطح برگ در تراكم متفاوت كاشت چغندرقند زمستانه

Study of number of green and dead leaves, dynamics of formation and leaf area index under different spacing of planting in winter sugar beet

In order to investigate effects of different planting spaces on morphological and physiological characteristics and also on quantitative yield of sugar beet, an experiment was conducted in Safi-abad Research Center of Dezful during 1998-2000. This study was carried out in strip plot design. Treatments contained 20 stand density in intersection plot composing of four row spacing (45, 55, 65 and 75 cm) and five inter row spacing (15, 20, 25, 30, and 35 cm). The results showed that spacing had significant effect on number of green and dead leaves. Interaction for green leaves in two years and dead leaves in 1999-2000 was not significant while interaction effects for dead leaves was only significant in 1998-99. The number of green and dead leaves per plant negatively correlated with stand density. But those factors were positively correlated with increase in planting spaces. Mean number of maximum green and dead leaves in two years ranged from 38.4 and 40, respectively per plant with 38000 plant/ha (75*35) to 23.9 and 15.4 per plant with 148000 plant/ha (45*15). Stand density was positively correlated with leaf area index (LAI). Mean of maximum LAI differed from 6.4 in 148000 plant/ha to 3.3 in 38000 plant/ha.