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THE WATER RELATIONS AND IRRIGATION REQUIREMENTS OF CASHEW (ANACARDIUM OCCIDENTALE L.): A REVIEW

Published online by Cambridge University Press:  17 June 2013

M. K. V. CARR
M. K. V. CARR*
Affiliation:
Emeritus Professor, School of Applied Sciences, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK
*
†Corresponding author. Email: [email protected]. Contact address: Pear Tree Cottage, Frog Lane, Ilmington, Shipston on Stour, Warwickshire CV36 4LQ, UK.
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Summary

The centre of origin of cashew is believed to be Brazil, from where it has spread since the 16th century throughout the tropics. In recent years, Vietnam has surpassed India to become the world's largest producer of cashew nut. Most of the research on the water relations of cashew has been done in Brazil, where it is both a large-scale commercial and a smallholder crop, and in Australia, where cashew is a possible emerging new crop. There are two ‘types’ of cashew: ‘talls’ and ‘dwarfs’. Both are evergreen trees in which vegetative growth occurs in a series of flushes. Flowers form annually on the end of branches in the dry season, and flowering continues for two to four months. It then takes about two months from pollination for the nut to mature. Roots can extend to great depths (>5 m), while cashew's wide-spreading rooting habit is critical to its successful adaptation to semi-arid/dry conditions. The optimum temperature for CO2 assimilation is in the range 25–35 °C. Progressive closure of the stomata occurs at saturation deficits of the air >1.5 kPa. In the field, differences in rates of gas exchange between irrigated and unirrigated cashew trees only become apparent three or four months after the end of the rains, the stomata playing an important role in maintaining a favourable leaf water status in dry conditions. Sap flow measurements indicate transpiration rates of 20–28 L d−1 tree−1. Irrigation can be beneficial during the period from flowering to the start of harvest, but reliable estimates of water productivity have yet to be established. The best/only estimate is 0.26 kg (nut in shell) m−3 (irrigation water). There is a continuing need to develop a method to estimate the water requirements of cashew, to identify where and when irrigation of cashew is likely to be justified and to develop a practical irrigation schedule.

Type
Review Paper
Information
Experimental Agriculture , Volume 50 , Issue 1 , January 2014 , pp. 24 - 39
Copyright
Copyright © Cambridge University Press 2013 

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