Ethephon Stimulation and Yield Response of Some Hevea Clones in the Humid Forests of South West Cameroon

Table 1

Correlation coefficients between yield and weather variables.

Yields	Clone	Cumulative rainfall (mm)	Days of insolation	Mean temperature	Mean relative humidity
Field production; (kg/ha)	GT 1	0.8046**	−0.4763	−0.8084**	0.8337**
	IRCA 18	0.7173**	−0.7705**	−0.4506	0.6273*
	IRCA 19	0.6528*	−0.2026	−0.6067*	0.8264**
	PB 235	0.7558**	−0.6529*	−0.8139**	0.6147*
	PB 260	0.5524	−0.4637	−0.6094*	0.5205
	RRIC 100	−0.0883	−0.2171	−0.0741	−0.0094
	RRIC 110	0.7438**	−0.3517	−0.692*	0.738**
Tree productivity; (g/t/t)	GT 1	0.8432**	−0.6025*	−0.8481**	0.7011*
	IRCA 18	0.562	−0.6156*	−0.2197	0.2983
	IRCA 19	0.6024*	−0.2388	−0.5369	0.5979*
	PB 235	0.6102*	−0.5444	−0.6749*	0.5257
	PB 260	0.4454	−0.4981	−0.5089	0.2663
	RRIC 100	0.7432**	−0.6047	−0.7737	0.5794
	RRIC 110	0.6792*	−0.3864	−0.6133*	0.501

Significant at **1%; *5%.