Environmental Systems Research

Table 2 Average values of root volume, root area, root length, and root diameter per sampling point using the volumetric ring 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	0.640	− 0.439ab	5.131	0.588a	0.014	0.096c	0.373	− 0.759de
0.10–0.20	0.512	− 0.578b	4.489	0.497abc	0.014	0.111c	0.327	− 0.509ab
0.20–0.30	0.607	− 0.528ab	5.062	0.599ab	0.015	0.115c	0.338	− 0.494a
0.30–0.40	0.467	− 0.603bcd	5.269	0.504abc	0.017	0.175abc	0.303	− 0.558ab
0.40–0.50	0.439	− 0.617bcd	4.407	0.442abc	0.018	0.300abc	0.295	− 0.549ab
0.50–0.60	0.467	− 0.648cde	4.898	0.503abc	0.020	0.250a	0.266	− 0.590bc
0.60–0.70	0.771	− 0.505a	6.587	0.588a	0.019	0.198abc	0.314	− 0.565abc
0.70–0.80	0.725	− 0.443a	5.874	0.562a	0.019	0.200ab	0.315	− 0.759e
0.80–0.90	0.367	− 0.759e	4.090	0.415c	0.019	0.194abc	0.249	− 0.655cd
0.90–1.00	0.435	− 0.696de	4.320	0.442bc	0.016	0.1446bc	0,277	− 0.585abc
f-value	1.651	6.795	1.986	3.219	6.061	7.479	10.876	7.378
Deviation error	3.55	0.45	15.20	0.52	1.82	0.33	0.20	0.53
df	12.65	0.67	230.76	0.27	3.30	0.11	0.04	0.29
Valid samples	3352	3336	3352	3336	3352	3336	3352	3336

^*Means with logarithmic transformation followed by the same letter do not differ by Duncan’s test at 5% probability
^aNumber of observations (n) = 3353

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