Result of Field Performance of C. zizanioides and C. nigritanus

4.1.1    Growth on Land

Results of field performances showed that growth parameters varied in both species. The highest leaf length and width observed in C. nigritanus was 84 cm and 1.1 cm respectively, while, those in C. zizanioides were 66.5 cm and 0.9 cm respectively (Table 1).

Table 1: Growth parameters of C. zizanioides and C. nigritanus after 12 weeks in the field.

Weeks	No. of fresh leaves		Number of tillers		No. of dead leaves		Area of fresh leaves
	C. zizanioides	C. nigritanus	C. zizanioides	C. nigritanus	C. zizanioides	C. nigritanus	C. zizanioides	C. nigritanus
Week 2	21	29	5	7	11	7	28	39
Week 4	23	44	7	10	10	10	43	59
Week 6	26	59	8	14	13	11	44	64
Week 8	30	72	9	16	14	11	53	79
Week 10	54	87	12	19	10	7	54	84
Week 12	68	97	13	21	9	6	60	87

The values obtained were further subjected to statistical test using chi-square test at 5 % level of significance. This revealed a χ² - table value of 7.814 at (P < 0.05) and a χ² - calculated value of 1.47.

Results of field performances also showed that there is a positive correlation between the leaf length and number of leaves (r = 0.873), leaf width and leaf length (r = 0.896) and between leaf width and number of tillers (r = 0.846) in C. zizanioides at 5 % level of significance (Table 2a). In C. nigritanus, the leaf length only correlates positively with leaf width (r = 0.899) at 5 % level of significance (Table 2b).

Table 2a: Pearson’s correlations of growth parameters of C. zizanioides on land

	Number        of fresh     leaves	Number of tillers		Number of dead leaves	Leaf length	Leaf width	Area of fresh leaves
Number of leaves	1
Number of tillers	.947**		1
	.004
Dead leaves	-.575		-.374	1
	.232		.466
Leaf length	.873*		.954**	-.235	1
	.023		.003	.654
Leaf width	.645		.846*	-.015	.896*	1
	.166		.034	.978	.016
Leaf area	.794		.931**	-.138	.978**	.969**	1
	.059		.007	.795	.001	.001

*. Correlation is significant at the 0.05 level. Upper values represent correlation. Lower values represent significance level Positive correlation exist between the leaf length and number of leaves (r = 0.873), between leaf width and leaf length (r = 0.896) and between leaf width and number of tillers (r = 0.846).

 

     Table 9b: Correlations of growth parameters of C. nigritanus on land

**. Correlation is significant at the 0.01 level. *.   Correlation is significant at the 0.05 level.             Upper values represent correlation. Lower values represent significance level Positive correlation (r = 0.899) exist between leaf length and leaf width at 0.05 level

Table 2b: Pearson’s correlations of growth parameters of C. nigritanus on land

                           

	Number of Fresh Leaves	Number of Tillers	Number of Dead Leaves	Leaf Length	Leaf Width	Area of Fresh Leaves
Leaf number	1
Tiller number	.998**	1
	.000
Dead leaves	-.302	-.267	1
	.561	.609
Leaf length	.935**	.938**	-.056	1
	.006	.006	.916
Leaf width	.940**	.936**	-.087	.899*	1
	.005	.006	.870	.015
Leaf area	.973**	.971**	-.121	.974**	.972**	1
	.001	.001	.819	.001	.001

*. Correlation is significant at the 0.05 level. Upper values represent correlation. Lower values represent significance level Positive correlation exist between the leaf length and leaf width (r = 0.899).

                                                                                

*.  Correlation is significant at the 0.05 level.    Upper values represent correlation. Lower values represent significance level

 4.1.2   Growth on Water

             Results of the root length of Vetiver grown hydroponically for four weeks are presented in Figure 2 below.

Figure 2: Comparative root length of C. zizanioides and C. nigritanus after four weeks in                    hydroponic setup.

Plate 2: C. zizanioides in hydroponic setup

fx

Plate 3: C. nigritanus in hydroponic setup

The root lengths of C. nigritanus and C. zizanioides after four weeks in hydroponics are not significantly different (P > 0.05).

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