Richard J. Volk

Contributions of shoot and root nitrogen-15 labeled legume nitrogen sources to a sequence of three cereal crops

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 66(2), 523–530.

Nitrogen-15 recovery in soil incubated with potassium nitrate and clover residues

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 65(5), 1430–1436.

Nitrogen-15 labeling effectiveness of two tropical legumes

PLANT AND SOIL, 200(2), 149–156.

Source and magnitude of ammonium generation in maize roots

PLANT PHYSIOLOGY, 118(3), 835–841.

Tracing nitrogen movement in corn production systems in the North Carolina Piedmont: A nitrogen-15 study

AGRONOMY JOURNAL, 90(2), 171–177.

Unidirectional fluxes of nitrate into and out of maize roots: measurement and regulation by prior nitrate nutrition

Plant Science, 123(1997), 1–7.

Beneficial effects of concurrent ammonium and nitrate nutrition on the growth of Phaseolus vulgaris: A 15N study

Plant Physiology and Biochemistry, 30(4), 487.

REDUCTION OF PLANT-TISSUE NITRATE TO NITRIC-OXIDE FOR MASS-SPECTROMETRIC N-15 ANALYSIS

ANALYTICAL BIOCHEMISTRY, 97(1), 131–135.

Photorespira-tory phenomena in maize: Oxygen uptake, isotope discrimination and carbon dioxide efflux

Plant Physiology, 49(2), 218.