Variable upper and lower crop water stress index baselines for corn and soybean

Payero, J. O. and Irmak, S. (2006) Variable upper and lower crop water stress index baselines for corn and soybean. Irrigation Science, 25 1: 21-32.


Author Payero, J. O.
Irmak, S.
Title Variable upper and lower crop water stress index baselines for corn and soybean
Journal name Irrigation Science   Check publisher's open access policy
ISSN 0342-7188
1432-1319
Publication date 2006-10
Sub-type Article (original research)
DOI 10.1007/s00271-006-0031-2
Volume 25
Issue 1
Start page 21
End page 32
Total pages 12
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract Upper and lower crop water stress index (CWSI) baselines adaptable to different environments and times of day are needed to facilitate irrigation scheduling with infrared thermometers. The objective of this study was to develop dynamic upper and lower CWSI baselines for corn and soybean. Ten-minute averages of canopy temperatures from corn and soybean plots at four levels of soil water depletion were measured at North Platte, Nebraska, during the 2004 growing season. Other variables such as solar radiation (R s), air temperature (T a), relative humidity (RH), wind speed (u), and plant canopy height (h) were also measured. Daily soil water depletions from the research plots were estimated using a soil water balance approach with a computer model that used soil, crop, weather, and irrigation data as input. Using this information, empirical equations to estimate the upper and lower CWSI baselines were developed for both crops. The lower baselines for both crops were functions of h, vapor pressure deficit (VPD), R s, and u. The upper baselines did not depend on VPD, but were a function of R s and u for soybean, and R s, h, and u for corn. By taking into account all the variables that significantly affected the baselines, it should be possible to apply them at different locations and times of day. The new baselines developed in this study should facilitate the application of the CWSI method as a practical tool for irrigation scheduling of corn and soybean.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Communicated by S. Raine

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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