Summary
The growth response of kenaf (Hibiscus cannabinus L.) to four irrigation schedules based on leaf water potential Χl was evaluated in a semi-arid tropical environment. Total dry matter production was unaffected by regimes in which the mean value of leaf water potential Χl (mean of solar noon and dawn value) did not fall below −1.26 MPa. Stem elongation was more sensitive than dry matter accumulation to plant water stress. — The economic yield for paper pulp production (i. e. total plant dry matter production minus that of the foliage and upper 60 cm of stem) increased with the frequency of irrigation. — Growth recovery by kenaf following a period of water stress was examined. Alleviation of water stress 10 weeks after irrigation, when Χl was −1.60 MPa, produced stem elongation rates that were greater than those of plants previously receiving irrigation. This ability to withstand water stress and partially compensate in growth following alleviation of the stress indicates that the kenaf crop has stress response features suitable for rainfall only production under semi-arid tropical conditions. — Irrigation schedules based on Χl resulted in water applications tailored to crop requirements in that water use increased, and the time interval between irrigation decreased, with increasing canopy development as well as with increasing evaporative demand. However, erratic fluctuations in Χl between irrigations make scheduling by this method difficult and the use of daily mean, dawn or noon values of Χl for scheduling irrigation of kenaf cannot be recommended in environments of high evaporative demand. The factors contributing to these fluctuations in (Χl) are discussed.
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Muchow, R.C., Wood, I.M. Yield and growth responses of kenaf (Hibiscus cannabinus L.) in a semi-arid tropical environment to irrigation regimes based on leaf water potential. Irrig Sci 1, 209–222 (1980). https://doi.org/10.1007/BF00277626
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DOI: https://doi.org/10.1007/BF00277626