Table 2. DTPA-Zn concentration (mean ± SE, n = 3) of soils with the addition of straw and Zn at the various incubation periods.

Treatment		DTPA-Zn concentration(mg kg-1)
		60	120	150	165	180	195	210
0	0	0.75 ± 0.03	0.77 ± 0.07	0.72 ± 0.08	0.65 ± 0.05	0.76 ± 0.05	0.75 ± 0.04	0.86 ± 0.01
	Straw	0.81 ± 0.08	0.69 ± 0.01	0.62 ± 0.04	0.73 ± 0.02	0.92 ± 0.06	0.98 ± 0.05	0.99 ± 0.02
Zn	0	4.65 ± 0.05	5.06 ± 0.15	4.57 ± 0.21	4.23 ± 0.19	4.72 ± 0.17	4.66 ± 0.05	4.60 ± 0.15
	Straw	4.87 ± 0.05	5.15 ± 0.11	4.43 ± 0.33	4.09 ±0.10	4.96 ± 0.20	4.77 ± 0.05	4.54 ± 0.08
LSD0.05 of A or Ba		0.12	0.24	0.27	0.25	0.31	0.11	0.20
LSD0.05 of A×Bb		0.18	0.33	0.39	0.36	0.45	0.15	0.28

Note:

^aThe value of LSD (least significant difference) for main effects of Zn (A) or straw (B) at 5%.

^bThe values of LSD for interaction between Zn (A) and straw (B) at 5%.