Changes in Soluble-N in Forest and Pasture Soils after Repeated Applications of Tannins and Related Phenolic Compounds
Table 3
Soluble-N (mg kg−1 soil) extracted with treatment solutions†.
Single treatment
Cumulative after treatment 8
Cool water
Hot water
Final total
Trt
Forest
Pasture
Forest
Pasture
Forest
Pasture
Forest
Pasture
Forest
Pasture
Avg. ()
Avg. ()
Avg. ()
Avg. ()
Avg. ()
H2O
70 (1)
94 (10)
82 (7)AB
147 (4)
186 (19)
166 (11)AB
4.9 (0.3)
5.8 (0.8)
5.3 (0.4)AB
107 (4)
191 (27)
149 (20)A
259 (6)
383 (45)
321 (31)A
MG
83 (3)
102 (10)
93 (6)A
166 (6)
193 (19)
179 (11)A
5.5 (0.5)
5.7 (0.5)
5.6 (0.3)A
98 (5)
170 (26)
134 (18)AB
269 (10)
368 (44)
319 (28)A
CAT
70 (1)
91 (8)
81 (6)AB
137 (3)
165 (14)
151 (9)BC
4.2 (0.4)
4.8 (1.0)
4.5 (0.5)BC
91 (3)
166 (24)
129 (18)AB
231 (6)
336 (37)
284 (26)A
SOR
65 (1)
82 (8)
74 (5)BC
136 (3)
154 (13)
145 (7)BC
6.2 (0.3)
5.4 (0.5)
5.8 (0.3)A
95 94)
129 (8)
112 (8)BC
237 (6)
289 (20)
263 (14)A
GA
69 (1)
75 (7)
72 (3)BC
131 (3)
131 (12)
131 (6)CD
5.5 (0.4)
5.0 (0.4)
5.3 (0.3)AB
107 (3)
148 (19)
128 (12)AB
244 (5)
284 (31)
264 (16)A
TA
61 (1)
70 (5)
66 (3)C
110 (2)
116 (9)
113 (5)DE
5.0 (0.7)
4.5 (0.7)
4.8 (0.5)ABC
86 (3)
106 (9)
96 (6)CD
201 (4)
226 (17)
213 (10)B
PGG
53 (2)
61 (6)
57 (3)D
105 (3)
110 (9)
108 (4)E
4.2 (0.2)
4.0 (0.5)
4.1 (0.2)C
78 (4)
99 (8)
89 (6)D
188 (4)
213 (17)
200 (9)B
Avg. ()
67 (2)Y
82 (4)X
133 (4)Y
151 (8)X
5.1 (0.2)
5.0 (0.2)
95 (2)Y
144 (9)X
233 (6)Y
300 (16)X
†Treatment solutions consisted of a water control or supplied 10 mg of methyl gallate (MG), gallic acid (GA), catechin (CAT) condensed tannin from sorghum (SOR), tannic acid (TA), or β-1,2,3,4,6-penta-O-galloyl-D-glucose (PGG) per g soil. Data are arithmetic average (standard error) (). Main effects of land use (column averages, ) or treatments (row averages, ) are denoted by capital letters (Tukey’s HSD, ).