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Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2021 ASABE Annual International Virtual Meeting  2101077.(doi:10.13031/aim.202101077)
Authors:   Temitayo Abayomi Ewemoje, Prof., Habeeb Adedotun Alabi, Engr., David Adewale Ajekiigbe, Mayowa Emmanuel Salawu, Samuel Adeyemi Bamidele, Busayo Samuel Ayeni
Keywords:   Amaranthus hybridus yield, Irrigation scheduling, Light intensity, Tropical environment

Abstract. Light intensity and water availability affect physiological processes and growth of plants while irrigation scheduling ensures adequate water supply all year round. Several works has been on water management for the crop but there is dearth of information on light intensity reduction effects. Hence, the study was therefore designed to determine effects of light reduction and irrigation scheduling (25%, 50%, 75%, and 100% FC) on growth and yield of amaranthus hybridus. Randomised Complete Block Design (RCBD) was used. Irrigation treatments (25%, 50%, 75%, and 100% FC) were applied on shaded and non-shaded fields and replicated thrice. Growth data (plant height, stem girth, and number of leaves) were measured weekly and biomass yield determined at 6 Weeks After Planting for two dry seasons. The 20% light intensity reduction from 1,242 Lux to 248 Lux affected growth parameters, bulk weight and yield significantly. Growth parameters (plant height, stem girth, and number of leaves) taken together showed significant differences (P<0.05) among the 100%, 75%, 50%, and 25% water applications in both shaded and unshaded fields. There was significant difference (P<0.05) between biomass yield of 100% FC and 75% FC; 75% FC and 50% FC of the shaded field. Also, there was significant difference between the biomass yield of the 100% FC and 75% FC; 75% FC and 50% FC of the open field. The 100% FC gives maximum yield per unit area per water applied, and is therefore the best of all irrigation schedules for both shaded and open field.

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