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Agronomy Journal Abstract -

Radiation and Energy Balance of a Trickle-Irrigated Lemon Grove1


This article in AJ

  1. Vol. 70 No. 4, p. 568-572
    Received: Dec 29, 1976

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  1. J. Ben-Asher and
  2. T. W. Sammis2



Trickle irrigation has become a widely used method. Its primary advantage in arid regions is that it saves water. However, because of its modernity, analytical and experimental results are minute compared to those for conventional irrigation methods. This study was conducted to evaluate the water saving potential and evapotranspiration from a trickle irrigated lemon grove (Citrus Union L. ‘Lisbon’). Detailed measurements of global, reflected, and net radiation and its dissipation above the plant, the unshaded sandy soil, and the area as a whole were made in the spring and summer of 1975. Two sources of radiant energy were observed: net radiation which accounted for 70% of the energy utilized in evapotranspiration and reflected radiation from the unshaded soil accounting for 30%. Experimentally the net radiation and evapotranspiration of the wet complex increased as the average net radiation and the evapotranspiration from the area as a whole decreased and vice versa. On the other hand, evapotranspiration and its ratio to evaporation from a class A pan were smaller than any previously reported values. Therefore, it is suggested that for these two periods the contribution of energy from the dry area to the wet did not reflect a specific disadvantage for trickle irrigation.

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