Responses of Soil Microbial Biomass and Enzyme Activities to Tillage and Fertilization Systems in Soybean (Glycine max L.) Production · Knowledge Library

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Responses of Soil Microbial Biomass and Enzyme Activities to Tillage and Fertilization Systems in Soybean (Glycine max L.) Production · Knowledge Library

dehydrogenase activity

↑ 33

increase
NT vs. CTsignificant · 0–30 cm · flowering2012-2013 · Research Farm of Kurdistan University · averaged fertilizers; Table5 NT a/CT b overrides wording tended; printed PNP unit conflicts with TPF method
Numbers
- treatment 68.16 vs. control 63.8 µg PNP g-1 h-1 (as printed) (+6.839 %)
Source · p. 7
“NT treatment brought about a significantly higher soil dehydrogenase activity in comparison with CT and MT treatments”
increase
F4 FYM plus compost vs. F3 chemical fertilizersignificant · 0–30 cm · flowering2012-2013 · Research Farm of Kurdistan University · averaged tillage; Table5 F4 a/F3 c; unit as printed
Numbers
- treatment 85.71 vs. control 37.7 µg PNP g-1 h-1 (as printed) (+127.3 %)
Source · p. 4
“Dehydrogenase activity was significantly higher in soils receiving organic fertilizers (F4) than those under chemical fertilizer treatment.”
increase
Organic manure treatments (F1, F2, F4), pooled vs. Chemical or combined fertilizers (F3, F5, F6, F7), pooledsignificant · 0–30 cm · Flowering stage, 2012 and 2013 combined · Research Farm of Kurdistan University · Explicit pooled organic-only F1,F2,F4 versus chemical or combined F3,F5,F6,F7 contrasts within NT, MT and CT separately; Table4 **p<.01. Dehydrogenase unit retained as Table5 prints PNP, although Methods uses TTC-to-TPF assay. No individual-level significance inferred.
Numbers
- treatment 80.76 vs. control 68.8 µg PNP g-1 h-1 (as printed) (+17.38 %) · NT; organic-only versus chemical or combined pooled contrast
- treatment 77.26 vs. control 63.55 µg PNP g-1 h-1 (as printed) (+21.57 %) · MT; organic-only versus chemical or combined pooled contrast
- treatment 68.76 vs. control 58.3 µg PNP g-1 h-1 (as printed) (+17.94 %) · CT; organic-only versus chemical or combined pooled contrast
Source · p. 4
“Contrast analysis showed that in all tillage treatments, organic manure treatments increased the dehydrogenase activity unlike other fertilized treatments (Table 4).”

urease activity

↑ 33

increase
F4 FYM plus compost vs. F3 chemical fertilizersignificant · 0–30 cm · flowering2012-2013 · Research Farm of Kurdistan University · within NT/MT/CT; Fig2 F4 a/F3 d,f,f; LSD.05; no between-tillage inference
Source · p. 4
“Applying chemical fertilizers to CT treatment (CT- F3) significantly decreased urease activity, whereas adding organic manure to NT treatment (NT-F4) resulted in an increase in its activity”
Source · p. 1
“The soil treated with a mixture of compost and FYM inputs had the maximum urease activity of all tillage treatments.”
increase
compost-bearing treatments pooled F2,F4,F6,F7 vs. without compost pooled F1,F3,F5significant · 0–30 cm · flowering2012-2013 · Research Farm of Kurdistan University · Explicit orthogonal compost-bearing F2,F4,F6,F7 versus no-compost F1,F3,F5; each tillage; Table4 **p<.01, not Table3 omnibus legend
Numbers
- treatment 56.75 vs. control 45.05 µg urea hydrolyzed g-1 h-1 (+25.97 %) · NT pooled contrast
- treatment 47.62 vs. control 40.5 µg urea hydrolyzed g-1 h-1 (+17.58 %) · MT pooled contrast
- treatment 41.87 vs. control 31.83 µg urea hydrolyzed g-1 h-1 (+31.54 %) · CT pooled contrast
Source · p. 4
“With compost bearing treatments, the urease activity was increased by 41.6, 17.5, and 31.5% in NT, MT, and CT treatments respectively.”
increase
FYM-bearing treatments pooled F1,F4,F5,F7 vs. without FYM pooled F2,F3,F6significant · 0–30 cm · flowering2012-2013 · Research Farm of Kurdistan University · Explicit orthogonal FYM-bearing F1,F4,F5,F7 versus no-FYM F2,F3,F6; each tillage; Table4 **p<.01
Numbers
- treatment 56.1 vs. control 46 µg urea hydrolyzed g-1 h-1 (+21.96 %) · NT pooled contrast
- treatment 51.25 vs. control 36.66 µg urea hydrolyzed g-1 h-1 (+39.8 %) · MT pooled contrast
- treatment 41.5 vs. control 32.33 µg urea hydrolyzed g-1 h-1 (+28.36 %) · CT pooled contrast
Source · p. 4
“compared to treatments without FYM, in FYM bearing treatments, the urease activity was increased by 21.9, 17.5, and 28.3% in the NT, MT, and CT treatments respectively”

Sites

Research Farm of Kurdistan University

Location: Sanandaj, Iran35.25° N, 47.02° E
Soil: Xerorthents (Typic, coarse Loamy, mixed, superactive, calcareous, mesic) · USDA
Land use: soybean fieldArable land
Management on the whole site: soybean Williams cultivarSoybean/Glycine max

Soil layers
Depth	Texture	Clay	pH	Organic C	Bulk density
baseline soil (depth not stated)	Sandy loam	20 %	7.6 pH	16.2 g kg-1	–