Table 3. Comparison of dry matter yield between climate events for Italian ryegrass based on regions and seasons

Regions	Seasons	Events	N	Dry matter yield (kg/ha)	t-test
Central inland	Autumn	Normal	162	10,698.40 ± 310.14	3.93*
	Autumn	Low-temperature	159	9,246.88 ± 201.20	3.93*
	Winter	Normal	298	10,153.57 ± 195.39	3.66*
	Winter	Severe cold	23	7,533.83 ± 478.68	3.66*
	Spring	Normal	194	10,776.06 ± 253.86	5.79*
	Spring	Drought	127	8,728.23 ± 237.99	5.79*
Southern inland	Autumn	Normal	85	9,170.87 ± 361.30	−1.65 (p = 0.10)
	Autumn	Low-temperature	22	8,334.09 ± 355.37	−1.65 (p = 0.10)
	Winter	Normal	93	9,538.85 ± 291.65	−5.23*
	Winter	Severe cold	14	5,411.50 ± 609.22	−5.23*
	Spring	Normal	70	9,140.99 ± 422.63	−0.78 (p = 0.44)
	Spring	Drought	37	8,729.86 ± 319.28	−0.78 (p = 0.44)
Southern coast	Autumn	Normal	Not classified
	Autumn	Low-temperature	Not classified
	Winter	Normal	127	14,403.50 ± 1,769.99	0.53 (p = 0.61)
	Winter	Severe cold	8	13,424.76 ± 483.68	0.53 (p = 0.61)
	Spring	Normal	52	14,749.92 ± 515.27	5.89*
	Spring	Drought	83	12.688.87 ± 673.40	5.89*

p<0.05.