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The Effect of Sprinkling Intensity and Soil Type on Oxygen Flux During Irrigation and Drainage¹

ABSTRACT

The effect of sprinkling intensity on oxygen flux in sand, loam, and clay soil was measured with platinum electrodes. In all three soils, the interval between two consecutive irrigations could be divided into four periods: (i) From the beginning of irrigation until the wetting front reached the electrode, the reduction current was unrelated to oxygen flux and the measurements were meaningless. (ii) When the wetting front reached the electrode, high values were recorded. From then on, the oxygen flux decreased to a minimum value by the end of the irrigation. (iii) Shortly after irrigation and until drainage had almost ceased, flux increased to a new peak. (iv) Hereafter, the reduction current decreased although the real oxygen diffusion presumably increased.

Oxygen flux was higher at the low irrigation intensity, which is attributed to a lower soil moisture content during infiltration at this rate. Aggregate breakdown and crust formation on the soil surface due to the high irrigation intensity inhibit gas exchange.

¹ Received Feb. 3, 1971. Approved June 8, 1971.

² Div. of Irrigation, Faculty of Agr., Hebrew University, Rehovot, Israel.

³ Div. of Agr. Meteorology, Volcani Inst. of Agr. Res., Bet Dagan, Israel.