ABSTRACT:
Interest in chemical or chemical plus tillage fallow systems has increased dramatically in Wyoming during the last 10 years. However, little information is available on their effects on available soil water or subsequent winter wheat (Triticum aestivum L.) production. Research was initiated at two locations to determine available soil water from May to October, grain yield, grain protein, and crop residue at planting with three fallow systems. Available soil water contents were highest in late May or early fune and then declined until early September, regardless of fallow system. These declines in soil water content resulted because evapotranspiration exceeded precipitation. Chemical and chemical-plus tillage fallow systems resulted in similar amounts of total available soil water as conventional tillage fallowing. Grain yields did not differ among fallow systems at Archer: while at Chugwater conventional tillage was the highest yielding one out of two years. Surface cover was greatest on the chemical fallow plots, however, it was not sufficient to reduce evapotranspiration and increase soil water content.
Footnotes
A. W. Dalrymple is with the Uniroyal Chemical Co., Inc., 74 Amity Road, Bethany, CT 06524; S.D. Miller is with the Department of Plant, Soil and insect Science and K.J. Fomstrom is unth the Department of Agricultural Engineering, University of Wyoming, Laramie, WY 82071. Contribution of the Wyoming Agric. Exp. Stn. Journal Paper 1691.
- Copyright 1993 by the Soil and Water Conservation Society
This article requires a subscription to view the full text. If you have a subscription you may use the login form below to view the article. Access to this article can also be purchased.