Importance of cover crops in alleviating negative effects of reduced soil tillage and promoting soil fertility in a winter wheat cropping system · Knowledge Library

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Importance of cover crops in alleviating negative effects of reduced soil tillage and promoting soil fertility in a winter wheat cropping system · Knowledge Library

weed biomass

3

decrease
cover crops vs. no cover crop controlsignificance not stated · October2013–2015 · Agroscope Changins — clay soil · Agroscope Changins — loam soil · Covercropvariantswithadequatebiomass,all3tillage systems;Fig3SEonly,noindividualorpooledpairtest
Numbers
- treatment 0.19 vs. control 1.14 t/ha (-83.33 %) · fieldpeasubgroup,averagedovertillageandyears
Source · p. 1
“In all tillage treatments, high cover crop biomass production allowed to supress weed biomass compared to the no cover crop control.”
Source · p. 6
“most of the cover crops allowed to decrease weed biomass below the level of the reference treatment, i.e. plough – no cover crop, even with minimum and no tillage”
increase
no till vs. ploughsignificance not stated · October2013–2015 · Agroscope Changins — clay soil · Agroscope Changins — loam soil · Averagedovercovervariants;Fig3no tillagepairtests;no borrowedTable2omnibusp
Numbers
- treatment 0.72 vs. control 0.46 t/ha (+56.52 %)
Source · p. 5
“Highest weed biomass was observed in no till plots (0.72 t/ha)”
Source · p. 12
“when cover crops did not grow well the system performed poorly, with high weed pressure, low wheat grain yield”
decrease
minimum and no tillage with adequately developed cover crops vs. plough – no cover crop reference treatmentsignificance not stated · October 2013–2015, three-year means · Agroscope Changins — clay soil · Agroscope Changins — loam soil · Explicit reference comparison supporting Abstract/Conclusion weed-control backbone. Merged MT/NT systems under sufficiently developed covers; NT phacelia at approximately the PL/no-cover reference is excluded, MT phacelia remains below it. No-cover MT/NT controls are excluded. Tillage and cover status differ from the reference, not held constant. Figure 3 shows SE bars without pairwise tests; no numerical biomass inferred from the graph. Rattail-fescue cover can be underestimated by biomass.
Source · p. 6
“most of the cover crops allowed to decrease weed biomass below the level of the reference treatment, i.e. plough – no cover crop, even with minimum and no tillage”
Source · p. 6
“except for phacelia which was particularly inefficient against weed in no till.”

Sites

Agroscope Changins — clay soil

Location: Agroscope Changins, Switzerland46.40° N, 6.23° E
Climate: 10.2 °C mean annual temperature999 mm annual precipitation
Land use: winter wheat croppingArable land
Management on the whole site: winter wheatWheat/Triticum aestivum, Nitrogen fertilisationNitrogen fertilizer

Soil layers
Depth	Texture	Clay	pH	Organic C	Bulk density
clay soil (characterisation depth not stated)	clay	48 %	–	–	–

Agroscope Changins — loam soil

Location: Agroscope Changins, Switzerland46.40° N, 6.23° E
Climate: 10.2 °C mean annual temperature999 mm annual precipitation
Land use: winter wheat croppingArable land
Management on the whole site: winter wheatWheat/Triticum aestivum, Nitrogen fertilisationNitrogen fertilizer

Soil layers
Depth	Texture	Clay	pH	Organic C