TABLE 2.

Porewater parameters measured at a 10-cm depth in each sample plot^a

Parameter and treatment	1998				1999
	June	July	August	September	January	August	October
pH
C	7.5 ± 0.1	7.5 ± 0.3	7.3 ± 0.3	7.2 ± 0.2	7.3 ± 0.1	7.7 ± 0.2	7.4 ± 0.1
G	7.4 ± 0.2	7.6 ± 0.3	7.3 ± 0.4	7.3 ± 0.5	6.9 ± 0.4	7.5 ± 0.2	7.3 ± 0.2
F	7.4 ± 0.1	7.4 ± 0.1	7.3 ± 0.1	7.1 ± 0.1	6.9 ± 0.2	7.5 ± 0.2	7.5 ± 0.4
Salinity (ppt)
C	33.5 ± 2.8	34.8 ± 3.3	36.2 ± 1.5	35.8 ± 1.7	33.2 ± 1.0	39.3 ± 1.0	31.3 ± 1.5
G	33.2 ± 3.1	35.0 ± 2.4	38.8 ± 2.7	38.8 ± 2.0	36.2 ± 1.8	47.7 ± 2.9	32.0 ± 4.4
F	31.3 ± 1.6	36.3 ± 1.2	37.2 ± 1.8	37.8 ± 1.0	36.0 ± 1.3	46.8 ± 2.1	33.0 ± 3.7
H2S (mM)
C	3.9 ± 0.6	3.6 ± 0.5	3.1 ± 1.1	4.8 ± 1.2	1.0 ± 0.7	4.9 ± 0.4	4.7 ± 0.7
G	3.0 ± 0.9	2.4 ± 0.8	2.2 ± 1.4	2.3 ± 1.8	0.1 ± 0.1	4.3 ± 0.8	4.2 ± 0.3
F	4.2 ± 0.6	3.2 ± 0.9	3.1 ± 1.0	3.2 ± 1.0	0.0 ± 0.0	4.9 ± 0.3	4.7 ± 0.5
NH4 (μM)
C	5.9 ± 3.3	6.1 ± 4.7	7.8 ± 5.7	9.3 ± 3.2	4.9 ± 3.8	9.1 ± 2.3	21.8 ± 17.3
G	24.9 ± 0.0	15.5 ± 8.8	43.4 ± 24.7	19.6 ± 17.8	29.7 ± 13.2	9.9 ± 5.3	41.3 ± 47.1
F	24.9 ± 0.0	21.4 ± 4.2	42.6 ± 16.2	33.8 ± 21.9	27.8 ± 13.3	10.9 ± 4.9	27.9 ± 11.1

^aC, control; G, ground treatment; F, foliar spray treatment. Values are the means of six results ± the standard deviations.