J. B. Gardner

The fate of nitrogen in grain cropping systems: a meta-analysis of 15N field experiments.

L. Drinkwater, Laurie E Drinkwater, J. B. Gardner, 2009, Ecological applications : a publication of the Ecological Society of America.

The Development of Artemisia afra (Jacq.) as a New Essential Oil Crop

J. B. Gardner, E. H. Graven, L. Webber, 1990 .

Native south african aromatic plants - a possible vehicle for rural development

J. B. Gardner, E. H. Graven, C. Tutt, 1986 .

Effect of Soil Type and Nutrient Status on the Yield and Composition of Tagetes Oil (Tagetes minuta L.)

J. B. Gardner, E. H. Graven, L. Webber, 1991 .