Environmental Systems Research

Table 3 Average values of root volume, root area, root length and root diameter per sampling point, using the hand auger hole method

From: Evaluation of the root system of Vetiver grass (Chrysopogon zizanioides L. Roberty) using different sampling methods

Samples depth^a (m)	Analyzed variables^b
	Root volume (mm³)		Root area (mm⁻²)		Root length (m)		Root diameter (mm)
	Mean	Log¹⁰	Mean	Log¹⁰	Mean	Log¹⁰	Mean	Log¹⁰
0.00–0.10	1.529	− 0.618c	13.509	0.576b	0.034	0.380a	0.232	− 0.637c
0.10–0.20	2.267	− 0.399ab	17.109	0.711ab	0.035	0.342ab	0.280	− 0.565b
0.20–0.30	1.551	− 0.412ab	12.569	0.711ab	0.031	0.368a	0.288	− 0.5601b
0.30–0.40	1.045	− 0.571bc	14.430	0.568a	0.029	0.266b	0.264	− 0.585b
0.40–0.50	1.910	− 0.248a	13.509	0.811a	0.034	0.300a	0.334	− 0.503a
f-value	1.605	5.968	2.293	3.812	2.791	2.481	17.867	22.267
Deviation error	15.03	0.78	65.78	0.781	5.25	0.44	0.14	0.17
df	226.05	0.610	4327.82	0.610	27.56	0.195	0.22	0.03
Valid samples	1525	1525	1525	1525	1525	1525	1525	1525

^*Means with logarithmic transformation followed by the same letter do not differ by Duncan’s test at 5% probability
^aNumber of observations (n) = 1526

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