Legacy Effects of Intercropping and Nitrogen Fertilization on Soil N Cycling, Nitrous Oxide Emissions, and the Soil Microbial Community in Tropical Maize Production

Maize-forage grasses intercropping systems have been increasingly adopted by farmers because of their capacity to recycle nutrients, provide mulch, and add C soil. However, shown increase nitrous oxide (N 2 O) emissions. Some tropical cause biological nitrification inhibition (BNI) which could mitigate N O emissions in the maize cycle but reactions microbial changes that explain are little known such systems. With this mind, we explored forage ( Brachiaria brizantha humidicola ) with distinct BNI yield potential cycling no-till production compared monocrop two rates (0 150 kg ha ?1 applied during season. These did not strongly compete period a negative effect on grain yield. We observed legacy these mineralization through soil microbiome growth. B. , genotype higher potential, increased net 0.4 mg day 1.86 NO 3 -N while moisture, fungi diversity, mycorrhizal fungi, bacterial nitrifiers, reduced saprotrophs prior Their moisture cumulative organic inputs (i.e., grass biomass) was associated enhanced at early effects contributed emission 12.8 4.8 O-N m ?2 for growing after respectively, regardless fertilization rate. Thus, can be outweighed impacts recycling, together dictate fluxes.