Table 1.

Effect of timing of N application on β-amylase activity in barley grains (U/g)

N treatment	2001		2002
	92-11	Xiumai 3	92-11	Xiumai 3
N1	1054.4 b*	925.8 b	979.8 b	951.6 b
N2	1338.7 a	1056.7 a	1153.9 a	1101.3 a
N3	1348.9 a	1054.4 a	1212.7 a	1136.2 a

^*Different letters after data within a column represent significant difference at 95% probability