Evaluation of the Nutrient Status of Some Hydrophytes in the Water Courses of Nile Delta, Egypt

Table 2

Variation in the mean concentration ± standard deviation of the different macronutrients in the living (L) and dead (D) parts of the studied species in relation to different seasons.

Variable		Na mg g^−1	K mg g^−1	Ca mg g^−1	Mg mg g^−1	N mg g^−1	P mg g^−1
	Echinochloa stagnina
Winter	L	25.2±1.3	23.4±0.7	15.1±0.4	8.7±0.4	10.9±0.2	0.3±0.1
	D	16.5±0.7	12.5±0.1	11.4±0.1	8.7±0.1	7.5±0.2	0.2±0.1
Spring	L	16.1±0.8	21.7±0.6	12.7±0.4	8.8±0.5	7.0±0.3	0.3±0.1
	D	14.0±0.4	11.5±0.2	9.2±0.1	7.9±0.4	4.2±0.2	0.2±0.1
Summer	L	21.7±1.1	24.3±0.9	14.2±0.5	5.4±0.3	8.5±0.3	0.3±0.1
	D	20.4±0.8	12.9±0.3	10.6±0.2	7.8±0.2	7.1±0.3	0.1±0.1
Autumn	L	26.0±1.0	21.6±0.7	14.0±0.4	8.3±0.4	8.3±0.2	0.3±0.1
	D	14.3±0.3	10.0±0.1	8.0±0.1	9.5±0.3	5.6±0.3	0.2±0.1
Annual mean	L	22.3±4.5	22.8±1.3	14.0±0.9	7.8±1.6	8.7±1.6	0.3±0.0
	D	16.3±2.9	11.7±1.3	9.8±1.5	8.7±0.9	6.1±1.5	0.2±0.1
F-value	L	4.35^**	ns	ns	4.50^**	ns	ns
	D	ns	ns	ns	4.48*	ns	Ns
	Eichhornea crassipes
Winter	L	17.4 ± 0.8	27.4 ± 1.2	26.5±0.7	11.3±0.3	6.7±0.1	0.3 ± 0.1
	D	32.8 ± 1.9	14.3 ± 0.5	20.6±0.1	10.1±0.1	1.6±0.1	0.2 ± 0.1
Spring	L	21.0 ± 0.6	31.2 ± 1.1	30.0±0.4	16.3±0.2	12.9±0.2	0.5 ± 0.1
	D	28.7 ± 1.2	17.4 ± 0.4	21.7±0.1	15.3±0.1	3.0±0.1	0.2 ± 0.1
Summer	L	22.5 ± 1.0	30.4 ± 1.3	27.8±0.4	13.3±0.4	19.7±0.3	0.4 ± 0.1
	D	36.8 ± 2.9	18.0 ± 1.2	25.8±0.3	14.7±0.2	3.3±0.1	0.2 ± 0.1
Autumn	L	21.4 ± 1.0	38.3 ± 1.1	28.7±0.4	18.3±0.6	26.5±0.8	0.7 ± 0.1
	D	27.1 ± 1.1	23.6 ± 0.3	19.2±0.3	21.1±1.9	4.0±0.1	0.2 ± 0.1
Annual mean	L	20.6 ± 2.2	31.8 ± 4.6	28.3±1.5	14.8±3.1	16.5±8.5	0.5 ± 0.2
	D	31.4 ± 4.4	18.3 ± 3.9	21.8 ± 2.8	15.3±4.5	3.0±1.0	0.2 ± 0.0
F-value	L	4.39^**	3.13*	3.61*	12.82^***	20.39^***	5.50^**
	D	—	—	—	—	—	—
	Ceratophyllum demersum
Winter		28.0 ± 0.5	29.3 ± 0.6	31.5 ± 0.7	14.5 ± 0.5	20.8 ± 0.1	0.7 ± 0.2
Spring		29.6 ± 0.6	31.5 ± 0.6	32.7 ± 0.6	17.5 ± 0.6	20.4 ± 0.2	0.6 ± 0.2
Summer		29.7 ± 0.8	29.2 ± 0.7	33.0 ± 0.9	24.5 ± 1.1	25.4 ± 0.5	0.6 ± 0.2
Autumn		37.5 ± 1.1	36.0 ± 0.7	35.8 ± 1.5	25.0 ± 0.9	24.0 ± 0.5	0.8 ± 0.2
Annual mean		31.2 ± 4.3	31.5 ± 3.2	33.3 ± 1.8	20.4 ± 5.2	22.7 ± 2.4	0.7 ± 0.1
F-value		ns	ns	ns	ns	ns	11.43^***

^∗𝑃<.05, ^∗∗𝑃<.01, ^∗∗∗𝑃<.001, ns: insignificant difference (P > .05).