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Nitrate Leakage from Soils Differing in Texture and Nitrogen Load¹

ABSTRACT

Nitrogen and chloride distribution in soil profiles underlying plots differing in the nitrogen load and soil type were studied in the coastal plain of Israel. Nitrate leakage was defined as the product of the average nitrate concentration in subsoil solution times the annual water recharge. A large portion of the excessive nitrogen (nitrogen load minus nitrogen uptake by the removal crop) was not recovered. This portion is high for clay soils and for plots receiving high nitrogen dressings. Changes in the NO₃/Cl ratio along the soil profile coincided with nitrate removal. This data supports the hypothesis that nitrate removal is mainly due to denitrification in the top layer of the soil.

Key Words: soil nitrogen balance • nitrate pollution • denitrification

¹ Contribution from the Soils and Fertilizers Lab., Technion, Israel Inst. of Technol., Haifa, Israel. This study was carried out in cooperation with Tahal—Water Planning for Israel, Ltd.

² Associate professor and graduate student, respectively.

Received for publication February 28, 1975.

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