A Visual Irrigation Guide for Maize (Zea mays L.)
- Lloyd A. Downey2
A guide for timing irrigation of maize to minimise water stress was developed. The guide utilized visual estimates of leaf relative water content (RWC) — taking a value of 90% as a critical lower limit. Known relationships between soil matric potential and vapour pressure deficit were used to define the critical RWC in a variable environment. In a semi-arid situation a simple measurement of temperature could replace the more complicated measurement of vapour pressure deficit. Hence need for irrigation could be ascertained from a graph, using a visual estimate of RWC and a measurement of air temperature. Elsewhere, vapour pressure deficit would have to be used instead of air temperature.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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