ﭘﻴﺶﺑﻴﻨﻲ ارﺗﻔﺎع ﺑﻮﺗﻪ دو رﻗﻢ ﻛﻠﺰا (Brassica napus L) ﺑﺎ اﺳﺘﻔﺎده از رواﺑﻂ آﻟﻮﻣﺘﺮﻳﻚ

Prediction of plant height (PH) is important for crop simulation models (especially competition modeling). Therefore, the objective of this study was to find relationships between PH and number of observed leaves on plant (total green and yellow leaves) (NOLP), stem dry weight (SDW) (g plant-1) and total vegetative components (leaves and stems) dry weight (TVDW) (g plant-1) in canola (Brassica napus L.). For this purpose, an experiment was conducted using two canola cultivars including RGS and Sarigol under optimum management condition during 2011-12 at field research of Sari Agricultural Sciences and Natural Resources University, Sari, Iran. The experimental design was a randomized compelet block desing with three replications. Sampling and mesuring of vegetative characteristics were started from beginning of growth and continued until maturity. A segmented model was used to describe allometric relationships between PH and the vegitative characteristics. The results indicated that there was no significant difference between cultivars beasd on confidence limited for the coefficients of the segmented model. Therefore, one general model can be used for both cultivars instead of individual model. Generally, significant relationships were found between PH and NOLP (R2 = 0.97), SDW (R2 = 0.96) and TVDW (R2 = 0.97). These models can be used for estimation of PH in simulation models of canola.