Effects of Combined Nutrient and Water Stress on the Growth of Hopea odorata Roxb. and Mimusops elengi Linn. Seedlings

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Figure 1.
The relationship between root length of H. odorata and M. elengi seedlings under two watering regimens as affected by fertilizer treatments after 12 months. Each point represents mean of six measurements. WW = well-watered plants; WS = water-stressed plants; RL = root length; F = fertilizer rate (g).
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Figure 2.
Root:shoot ratios of H. odorata and M. elengi seedlings under two watering regimens as affected by fertilizer treatments after 12 months. Each point represents mean of six measurements. WW = well-watered plants; WS = water-stressed plants; RL = root length; F = fertilizer rate (g).

Table 1.

Treatment combinations and levels of fertilizer applied.

Treatment	Amount added (g/pot) of NPK (20-10-5)
F0W0	No fertilizer and well-watered at field capacity ≥ –0.3 MPa
F0W1	No fertilizer and water-stressed at soil water potential ≥ –1.5 MPa
F1W0	10 g of fertilizer and well-watered at field capacity ≥ –0.3 MPa
F1W1	10 g of fertilizer and water-stressed at soil water potential ≥ –1.5 MPa
F2W0	20 g of fertilizer and well-watered at field capacity ≥ –0.3 MPa
F2W1	20 g of fertilizer and water-stressed at soil water potential ≥ –1.5 MPa
F3W0	30 g of fertilizer and well-watered at field capacity ≥ –0.3 MPa
F3W1	30 g of fertilizer and water-stressed at soil water potential ≥ –1.5MPa
F4W0	40 g of fertilizer and well-watered at field capacity ≥ –0.3 MPa
F4W1	40 g of fertilizer and water-stressed at soil water potential ≥ –1.5 MPa
F5W0	50 g of fertilizer and well-watered at field capacity ≥ –0.3 MPa
F5W1	50 g of fertilizer and water-stressed at soil water potential ≥ –1.5 MPa

Table 2.

Levels of nutrients applied (grams per pot)

Table 3.

Results of ANOVAs on height and diameter of Hopea odorata and Mimusops elengi seedlings after 12 months.

Type	Species	Source	df	MS	F	p
1	*H. odorata*
	Final height	Fertilizer	5	2487.45	3195.76	2.02E-71
		Watering	1	29165.15	37469.95	1.33E-85
		Fertilizer × watering	5	1081.45	1389.39	1.24E-60
		Within groups	60	0.77
2	Final diameter	Fertilizer	5	30.85	3113.25	4.42E-71
		Watering	1	998.67	100777	1.77E-98
		Fertilizer × watering	5	18.25	1841.69	2.81E-64
		Within groups	60	0.01
	*M. elengi*
3	Final height	Fertilizer	5	1380.95	2270.05	5.51E-67
		Watering	1	14308.68	2352.12	1.51E-79
		Fertilizer x watering	5	292.41	480.68	5.03E-47
		Within groups	60	0.61
4	Final diameter	Fertilizer	5	24.34	3947.17	3.66E-74
		Watering	1	65.74	10660.9	2.82E-69
		Fertilizer × watering	5	2.84	461.71	1.63E-46
		Within groups	60	0.01

Table 4.

Mean values of height and diameter of Hopea odorata and Mimusops elengi after 12 months of treatments.

Species	Treatment	Height	Diameter
Hopea odorata	F0W0^z	50.20 e^x	7.70 e
	F1W0	65.50 d	8.08 d
	F2W0	94.48 b	12.20 c
	F3W0	103.33 a	14.03 a
	F4W0	89.67 c	12.89 b
	F5W0	48.00 f	8.17 d
	F0W1	31.50 j	2.70 g
	F1W1	34.33 i	2.78 g
	F2W1	38.50 h	3.29 f
	F3W1	42.83 g	3.45 f
	F4W1	35.00 i	3.45 f
	F5W1	27.50 k	2.70 g
Mimusops elengi	F0W0	35.16 f	4.71 g
	F1W0	40.83 e	5.98 e
	F2W0	43.16 d	7.51 c
	F3W0	61.17 c	8.50 a
	F4W0	67.00 b	7.70 b
	F5W0	72.83 a	4.53 h
	F0W1	18.16 k	3.33 j
	F1W1	23.50 j	3.36 j
	F2W1	30.50 h	4.73 g
	F3W1	32.16 g	5.08 f
	F4W1	27.83 i	6.31 d
	F5W1	18.83 k	3.65 i

↵z Symbols are the same as for Table 1.
↵x Means with the same letter are not significantly different at P < 0.05 as determined by Duncan’s Multiple Range Test.