Abstract

Abstract Gardenia jasminoides Ellis and Ilex crenata Thunb. ‘Compacta’ were field-grown with 4 irrigation rates based on 0%, 25%, 50%, and 100% replacement of net evaporation from a class A pan. Irrigated gardenia were larger than nonirrigated gardenia, and those grown with 50% and 100% replacement of net evaporation had greater total root growth than nonirrigated plants. Root number, root dry weight, and fibrous root number in a 20-cm rootball were generally greater with irrigated plants than nonirrigated plants. Ilex crenata shoot growth was greater also with irrigation versus nonirrigation. Based on this data, 25% replacement of net evaporation resulted in plants of both species being similar to higher irrigation rates.

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