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Title:Relationship of crop metabolism and water status to irrigation need
Author(s):Jurgens, S.; Johnson, R.R.; Boyer, J.S.
Contributor(s):University of Illinois at Urbana-Champaign
Subject(s):Water resource development
Water resource development--Illinois
Crop yield
Water use
Geographic Coverage:Illinois (state)
Abstract:Irrigation represents the largest segment of consumptive water use in the U.S. Consequently, improvements in the efficiency of irrigation can have an important effect on the amount of water available for other uses. This research was initiated to determine the physiological limitations to crop yield during drought. The identification of these parameters may provide a way of estimating plant need for irrigation and avoiding unnecessary applications of water. Maize was grown to maturity, and photosynthesis and translocation of photosynthates were studied when drought occurred during grain development. Both carbon-14 labeling of the photosynthetic products and dry weight determinations indicated that net photosynthesis was substantially reduced whereas translocation was relatively rapid during drought. Furthermore, grain production occurred in proportion to the cumulative photosynthesis for the season. It was concluded that photosynthesis was more limiting than translocation to grain fill under dry conditions and that photosynthetic behavior could be used to reflect the need of maize crops for water.
Issue Date:1975-06
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Sponsor:U.S. Geological Survey
U.S. Department of the Interior
Rights Information:Copyright 1975 held by S. Jurgens, R.R. Johnson, J.S. Boyer
Date Available in IDEALS:2016-04-18

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