ﺮرﺳﻲ اﺛﺮ ﺗﻴﻤﺎرﻫﺎی ﻣﺨﺘﻠﻒ ﻛﻮد ﻓﺴﻔﺮ ﺑﺮ رواﺑﻂ آﻟﻮﻣﺘﺮﻳﻚ ﺑﻴﻦ ﺳﻄﺢ ﺑﺮگ و اﺟﺰای روﻳﺸﻲ در ﮔﻴﺎه ﺳﻮﻳﺎ (Glycine max (L.) Merr)

The objective of this study was to find out the relationships between leaf area (LA) and vegetative characteristics for example, green leaves dry weight (GLDW) (g plant-1), stem dry weight (SDW) (g plant-1) and total vegetative components (leaves and stems) dry weight (TVDW) (g plant-1) in soybean. Also, part of this study focused on investigation of the stability allometric relationships under different phosphorus fertilizer treatments (five rates: zero, 50, 100, 150 and 200 Kg/ha-1, respectively). For this purpose, an experiment was conducted using JK soybean cultivar under optimum management condition during 2012-13, 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 LA and the vegitative characteristics. The results indicated that there was no significant difference between fertilizer tratments beasd on confidence limited for the coefficients of the segmented model. Therefore, one general model can be used for all teratments instead of individual model. Generally, significant relationships were found between LA and GLDW (R2 = 0.97), SDW (R2 = 0.95) and TVDW (R2 = 0.96). These models can be used for estimation of LA in simulation models of soybean (especially for JK cultivar).