Long-term tillage and rotation effects on soil microbial biomass, carbon and nitrogen · Knowledge Library

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Long-term tillage and rotation effects on soil microbial biomass, carbon and nitrogen · Knowledge Library

total N

↑ 3= 27

increase
no-till vs. conventional tillagenot significant · 0–5 cm · April1984 · Moscow, Idaho field site · Actual Fig4c LSD(0.05)=0.11 percentage points exceeds surface difference. Possible caption error; do not silently substitute0.011.
Numbers
- percent_change 22
Source · p. 4
“Total N in the surface layer of no-till plots was 22°7o greater”
Source · p. 5
“LSD (0.05): a 10.2; \! b 0.02; e 0.11; d 0.28”
no effect
no-till vs. conventional tillagenot significant · 5–30 cm · April1984 · Moscow, Idaho field site · Pooled over rotations; WPA-specific deepest N exception recorded separately.
Source · p. 4
“than that of tilled plots, but there were no differences spring barley (B) and spring pea (P) rotation. Data from the April in the deeper layers.”
increase
WPA: winter wheat-spring pea undersown with red clover-alfalfa vs. WP: winter wheat-spring peasignificant · 15–30 cm · April1984 · Moscow, Idaho field site · WPA .23% versus other combinations .15–.18%; no exact comparator printed.
Source · p. 4
“15-30cm, no-till plots of WPA had significantly treatments over the depths measured.”
Source · p. 4
“higher total N (0.23°70) than the other tillage and rotasion analysis showed no relationship between any two for the WPA rotation was lower than that for the other dence of biomass (I1) on C levels (X) for 0-5 cm 15-30cm”
increase
WPA: winter wheat-spring pea undersown with red clover-alfalfa vs. WBP: winter wheat-spring barley-spring peasignificant · 15–30 cm · April1984 · Moscow, Idaho field site · WPA .23% versus other combinations .15–.18%; no exact comparator printed.
Source · p. 4
“15-30cm, no-till plots of WPA had significantly treatments over the depths measured.”
Source · p. 4
“higher total N (0.23°70) than the other tillage and rotasion analysis showed no relationship between any two for the WPA rotation was lower than that for the other dence of biomass (I1) on C levels (X) for 0-5 cm 15-30cm”
increase
WPA: winter wheat-spring pea undersown with red clover-alfalfa vs. WP: winter wheat-spring peasignificance not stated · 0–30 cm · April 1984 · Moscow, Idaho field site · Pooled rotation ranking across tillage and sampled depths, as stated in the abstract and Results. Underlying means are explicitly data not shown; qualitative direction only, no observations or pairwise test inferred. Distinct from NT-specific 15-30 cm finding-11.
Source · p. 1
“A rotation with two legume crops had the highest total C and N.”
Source · p. 3
“The WPA rotation had the highest mean total soil C, N, and biomass levels (data not shown).”
increase
WPA: winter wheat-spring pea undersown with red clover-alfalfa vs. WBP: winter wheat-spring barley-spring peasignificance not stated · 0–30 cm · April 1984 · Moscow, Idaho field site · Pooled rotation ranking across tillage and sampled depths. Underlying means are explicitly data not shown; qualitative direction only, no observations or pairwise test inferred. Distinct from NT-specific 15-30 cm finding-12.
Source · p. 1
“A rotation with two legume crops had the highest total C and N.”
Source · p. 3
“The WPA rotation had the highest mean total soil C, N, and biomass levels (data not shown).”
increase
no-till vs. conventional tillagesignificant · 15–30 cm · April 1984 · Moscow, Idaho field site · WPA rotation only. Results explicitly compare NT-WPA (.23% total N) with all other tillage/rotation combinations (.15-.18%). No exact conventional-WPA mean is printed; no computed or range-substituted mean. Fisher pairwise test .05 from Methods, not pooled Figure 4c LSD.
Source · p. 4
“15-30cm, no-till plots of WPA had significantly treatments over the depths measured.”
Source · p. 4
“higher total N (0.23°70) than the other tillage and rotasion analysis showed no relationship between any two”
Source · p. 4
“combinations (0.15%-0.18%).”

Sites

Moscow, Idaho field site

Location: about 3 km north of Moscow, Idaho
Climate: 550 mm annual precipitation
Land use: winter wheat-growing regionArable land

Soil layers
Depth	Texture	Clay	pH	Organic C	Bulk density
surface soil (depth not stated)	silt loam	–	5.2–5.8	–	–