|Douglas Jr, Clyde|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 11/1/1998
Publication Date: N/A
Technical Abstract: Water-use efficiency (WUE) was determined in a semi-arid region for spring wheat (SW), winter wheat (WW), and spring barley (SB) in consecutive years. Fertility variables were None, nitrogen alone (N), nitrogen plus sulfur (NS), and nitrogen plus sulfur plus phosphorus (NPS). Tillage was conventional (moldboard plow) or no-till. WUE for grain production increased with increasing fertilizer addition, with N increase in all three crops, S increase in spring grains, and P increase in SB and WW. WUE increases for dry matter production were similar to those for grain. Maximum WUE for grain (kg mm-1 of water use) was 12.4, 14.6, and 9.4 for SB, WW, and SW, resp. Cereal WUE was much lower for no-till than conventional tillage when fertility was inadequate (None, N, NS), but similar when NPS was applied.