花蓮地區不同期作之氣象因素對水稻產量之影響--結果-9 - 農業知識入口網

九、兩期作水稻穗數與氣象因素之相關分析
從表一可知第一期作的穗數較第二期作為多，且達顯著差異，因此針對稻作各生育期的氣象因素與穗數進行相關性分析，就表九的結果來看，第一期作的日高溫、抽穗前生育度數及全生育期生育度數與穗數呈顯著正相關，相關係數分別為0.61、0.73及0.64，亦即溫度為第一期作穗數的影響因子之一。
表九、氣象因素影響水稻‘台稉2號’穗數的相關分析
Table 9. Correlation between climatic factors and the panicle number per hill of the rice cultivar ‘TK2’.

Item		Correlation coefficient
		1st crop	2nd crop
Booting stage	Min air temp (℃)	0.36	-0.06
	Max air temp (℃)	0.61*z	0.42
	Solar radiation (MJ·m-2)	0.48	0.53
	Precipitation (mm)	-0.52	-0.17
	Precipitation days	-0.47	-0.54
Heading stage	Min air temp (℃)	-0.16	0.10
	Max air temp (℃)	-0.07	0.38
	Solar radiation (MJ·m-2)	0.37	0.20
	Precipitation (mm)	0.04	-0.17
	Precipitation days	-0.53	-0.29
Early maturing stage	Min air temp (℃)	-0.30	-0.16
	Max air temp (℃)	-0.18	0.34
	Solar radiation (MJ·m-2)	0.11	0.36
	Precipitation (mm)	0.38	-0.31
	Precipitation days	0.20	-0.31
Transplanting to heading	Min air temp (℃)	0.12	0.16
	Max air temp (℃)	0.24	0.47
	Solar radiation (MJ·m-2)	0.47	0.36
	Precipitation (mm)	0.14	0.17
	Precipitation days	0.33	0.14
	Growing degree days (℃)	0.73*	0.40
Transplanting to physiological maturity	Min air temp (℃)	-0.04	-0.09
	Max air temp (℃)	0.12	0.36
	Solar radiation (MJ·m-2)	0.36	0.35
	Precipitation (mm)	0.36	0.16
	Precipitation days	0.28	0.21
	Growing degree days (℃)	0.64*	0.41

^z* means significantly different between the two crop seasons at the 0.05 level.