Plantain-Tree Rubber Intercropping Systems Improved Productivity in the Tropical Humid Zone of Ghana, West Africa

Table 1

Stem girth and height growth of rubber tree at Ellembelle and Jomoro.

Treatments	Girth (mm) Ellembelle
	4 MAP	5 MAP	6 MAP	7 MAP	8 MAP	9 MAP	11 MAP
R	5.25	6.08	6.99	8.64	10.27	11.73	14.76
PR	5.78	6.88	8.00	9.32	10.56	12.57	16.24
PPR	6.33	7.36	8.53	10.18	11.07	12.92	17.49
PPPR	6.93	8.00	9.17	11.30	13.21	14.39	18.22
SED (5%)	0.19	0.13	0.21	0.55	0.60	0.44	0.42
CV (%)	3.90	2.30	3.10	6.80	6.50	6.90	3.10
Treatments	Girth (mm) Jomoro
	4 MAP	5 MAP	6 MAP	7 MAP	8 MAP	9 MAP	10 MAP	11 MAP	12 MAP	13 MAP	15 MAP
R	12.30	19.77	23.63	25.57	27.95	32.40	35.54	38.59	41.96	45.34	54.88
PR	14.28	21.22	25.12	28.73	32.85	35.50	38.42	41.10	44.40	47.39	55.67
PPR	16.32	22.57	28.94	31.89	36.40	39.34	43.48	44.64	47.43	50.72	61.33
PPPR	17.72	25.58	32.05	36.08	39.66	41.88	45.08	47.71	50.16	52.41	64.33
SED (5%)	0.50	0.59	0.21	0.31	0.65	0.47	0.78	0.28	0.45	0.41	0.47
CV (%)	4.10	3.20	1.00	1.20	2.30	1.50	2.40	0.80	1.20	1.00	1.00
Treatments	Height (cm) Ellembelle
	4 MAP	5 MAP	6 MAP	7 MAP	8 MAP	9 MAP	11 MAP
R	27.60	32.30	34.60	40.80	54.00	61.40	81.90
PR	26.60	29.40	36.70	38.70	54.60	65.30	98.10
PPR	28.20	32.80	38.80	49.10	57.90	67.80	103.60
PPPR	41.20	48.20	45.00	56.40	69.20	83.60	120.50
SED (5%)	5.76	NS	NS	NS	NS	NS	3.55
CV (%)	22.90	26.70	14.60	20.30	15.90	13.40	4.30
Treatments	Height (cm) Jomoro
	4 MAP	5 MAP	6 MAP	7 MAP	8 MAP	9 MAP	10 MAP	11 MAP	12 MAP	13 MAP	15 MAP
R	37.78	42.78	58.84	72.19	81.91	115.30	138.50	161.67	203.67	236.80	305.90
PR	42.65	47.65	60.52	79.67	87.56	129.44	150.49	176.78	227.06	252.60	335.40
PPR	48.67	56.08	66.50	86.50	95.89	139.06	161.29	197.44	242.57	282.60	351.80
PPPR	52.78	61.33	69.30	100.11	109.43	154.72	181.33	207.54	259.41	317.90	371.70
SED (5%)	0.53	0.43	0.56	1.01	1.47	1.20	1.11	1.48	1.82	3.24	3.73
CV (%)	1.40	1.00	1.10	1.50	1.90	1.10	1.00	1.00	1.00	1.50	1.30

MAP = months after planting; R = sole rubber; PR = low-density plantain; PPR = medium-density plantain; PPPR = high-density plantain; NS = not significant; SED = standard error of the difference; CV = coefficient of variation.