Plant Response to Climatic Factors. Udppsolu, Sweden Symp. Smika, D. E. and B. W. Greb. Protein content of winter wheat grain as related to soil and climatic factors in the semiarid Central Great Plains. Wicks, G.A. and D.E. Smika.
Chemical fallow in a winter wheat-fallow rotation.
J. of the Weed Sci. Soc. of Am. Greb, B. W., A. L. Black, and D. E. Smika. Straw buildup in soil with stubble mulch fallow in the semiarid Gread Plains. Heerman, D. F., H. H. Shull, and R. H. Mickelson.