Jan Willem van Groenigen

TL;DR: It is found that explicit evaluation of soil quality with respect to specific soil threats, soil functions and ecosystem services has rarely been implemented, and few approaches providing clear interpretation schemes of measured indicator values limits their adoption by land managers as well as policy.

TL;DR: In this paper, the relative importance of classical and nitrifier denitrification in N2O emitted from soil is a function of the soil moisture content, and likely of other environmental conditions as well.

TL;DR: In this paper, the authors used a global-scale meta-analysis to show that biochar has, on average, no effect on crop yield in temperate latitudes, yet elicits a 25% average increase in yield in the tropics.

TL;DR: It is shown, using meta-analysis, that on average earthworm presence in agroecosystems leads to a 25% increase in crop yield and a 23% increased in aboveground biomass and this suggests that earthworms stimulate plant growth predominantly through releasing nitrogen locked away in residue and soil organic matter.

TL;DR: A review of the overall effect of earthworms on the greenhouse-gas balance of soils suggests that although beneficial to fertility, earthworms tend to increase the net soil emissions of such gases as discussed by the authors.