  The magnetic structure, magnetoresistance, and Hall effect of
non-centrosymmetric magnetic semimetal NdAlGe are investigated revealing an
unusual magnetic state and anomalous transport properties that are associated
with the electronic structure of this non-centrosymmetric compound. The
magnetization and magnetoresistance measurements are both highly anisotropic
and indicate an Ising-like magnetic system. The magnetic structure is complex
in that it involves three magnetic ordering vectors including an incommensurate
spin density wave and commensurate ferrimagnetic state in zero field. We have
discovered a large anomalous Hall conductivity that reaches = 430
{\Omega}-1cm-1 implying that it originates from an intrinsic Berry curvature
effect stemming from Weyl nodes found in the electronic structure. These
electronic structure calculations indicate the presence of nested Fermi surface
pockets with nesting wave vectors similar to the measured magnetic ordering
wavevector and the presence of Weyl nodes in proximity to the Fermi surface. We
associate the incommensurate magnetic structure with the large anomalous Hall
response to be the result of the combination of Fermi surface nesting and the
Berry curvature associated with Weyl nodes.
