Table 1. Mean value, Standard Deviation (SD) of traits investigated under two phosphorus regimes and the Phosphorus Efficiency-Coefficient (PEC) of each trait.

Trait	Mean ± SD (LP)	Mean ± SD (OP)	Mean ± SD (PEC)
PRL	36.04 ± 6.38	34.78 ± 6.40	1.06 ± 0.22
TRL	809.34 ± 180.07	897.67 ± 209.74	0.92 ± 0.17
TSA	85.58 ± 19.32	89.48 ± 22.54	0.98 ± 0.19
TRV	0.74 ± 0.19	0.71 ± 0.21	1.07 ± 0.24
RAD	0.34 ± 0.02	0.31 ± 0.02	1.08 ± 0.06
TRT	788.62 ± 248.04	964.77 ± 291.77	0.85 ± 0.26
RF	1817.32 ± 583.50	2495.68 ± 735.22	0.74 ± 0.20
RL1	719.50 ± 158.99	815.93 ± 175.23	0.89 ± 0.17
RL2	64.31 ± 23.85	59.96 ± 24.05	1.12 ± 0.29
RL3	6.31 ± 1.74	6.23 ± 1.96	1.06 ± 0.29
RL4	2.51 ± 0.78	2.42 ± 0.87	1.14 ± 0.48
RL5	0.35 ± 0.18	0.41 ± 0.21	1.08 ± 1.48
RSA1	57.46 ± 12.14	59.90 ± 13.63	0.98 ± 0.19
RSA2	12.68 ± 4.58	11.86 ± 4.63	1.11 ± 0.29
RSA3	2.37 ± 0.65	2.34 ± 0.73	1.06 ± 0.29
RSA4	1.35 ± 0.42	1.30 ± 0.47	1.14 ± 0.48
RSA5	0.29 ± 0.17	0.36 ± 0.19	1.11 ± 1.77
RV1	0.41 ± 0.09	0.40 ± 0.10	1.05 ± 0.22
RV2	0.21 ± 0.07	0.19 ± 0.07	1.11 ± 0.29
RV3	0.07 ± 0.02	0.07 ± 0.02	1.07 ± 0.29
RV4	0.06 ± 0.02	0.06 ± 0.02	1.14 ± 0.48
RV5	0.02 ± 0.01	0.03 ± 0.02	1.20 ± 2.26
RT1	772.15 ± 232.56	951.37 ± 277.88	0.84 ± 0.25
RT2	6.64 ± 2.70	5.28 ± 2.20	1.48 ± 0.98
RT3	0.49 ± 0.49	0.46 ± 0.50	0.89 ± 1.17
RT4	0.27 ± 0.35	0.18 ± 0.30	0.39 ± 0.52
RT5	0.05 ± 0.05	0.06 ± 0.06	0.37 ± 0.49

Independent t-test indicated that the mean values of PRL and RAD were significantly high in LP condition compared to OP condition. LP, low phosphorus; OP, optimum phosphorus; PRL, primary root length; TRL, total root length; TSA, total root surface area; TRV, total root volume; TRT, total root tips; RAD, root average diameter; RF, root forks; RL^1-5, RSA^1-5, RV^1-5, RT^1-5 indicate average root length, root surface area, root volume and root tips in diameter between 0.0 and 0.5 mm, 0.5 and 1.0 mm, 1.0 and 1.5 mm, 1.5 and 2 mm and greater than 2.0 mm respectively.