About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in AJ

  1. Vol. 86 No. 6, p. 980-986
     
    Received: June 14, 1993
    Published: Nov, 1994


    * Corresponding author(s): !a031cbushlan@attmail.com
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1994.00021962008600060010x

Water-Yield Relationships for Irrigated and Dryland Wheat in the U.S. Southern Plains

  1. Jack T. Musick *,
  2. Ordie R. Jones,
  3. Bobby A. Stewart and
  4. Donald A. Dusek
  1. USDA-ARS, Conservation and Production Res. Lab., P.O. Drawer 10, Bushland, TX 79012

Abstract

Abstract

A climate with high evaporative demand and limited precipitation restrict yields of winter wheat (Triticum aestivum L.) grown in the semiarid U.S. southern High Plains. Stress effects can be avoided or minimized by management practices that increase soil water storage at planting or by application of irrigation water. We analyzed a 178 crop-year database of irrigated and dryland wheat data from Bushland, TX, to develop relationships that define the grain yield and water-use efficiency (WIDE) response to a wide range in seasonal evapotranspiration (ET) associated with water deficits and to evaluate yield response to stored soil water at planting. The ET-grain yield relationship was determined as linear, with a regression slope of 1.22 kg grain per m3 ET above the ET threshold of 208 mm required to initiate grain yield. Maximum yields (>7.0 Mg ha−1) required 650 to 800 mm seasonal ET. Maximum yields observed in the combined database were 25 and 8.2 Mg ha−1 for dryland and irrigated wheat, respectively. The linear regression response of grain yield to soil water stored at planting, 1.57 kg m−3, was significantly higher than the yield response to seasonal ET. Largely similar WUE values occurred over a wide range of seasonal ET within irrigated and dryland data sets; however, WUE values for irrigated wheat averaged about double the values for dryland wheat. A curvilinear relationship determined between WUE and yield emphasizes the importance of obtaining high yields for efficient water use.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .