Temporal Ion Balance Variation of an Irrigated Soilby G. Lopez, Istituto Sperimentale Agronomico, Bari, Italy,
A. Castrignanò, Istituto Sperimentale Agronomico, Bari, Italy,
V. Di Bari, Istituto Sperimentale Agronomico, Bari, Italy,
G. Marrone, Istituto Sperimentale Agronomico, Bari, Italy,
Abstract: The research was carried out in Southern Italy, from 1983 to 1988, using two gravity lysimeters irrigated with non saline water. The objective of this study was to test wether long-term cation uptake takes place on the exchange complex in fine-textured and swelling soils, of high cation exchange capacity, even under good drainage conditions. The ion balance was calculated for a silty clay soil, on which winter durum wheat and soybean, as double-crop, were alternately grown and harvested through the three first crop seasons and spring-summer sugar-beet was cropped in the two last years. Through the test period irrigation and drainage volumes, concentration and chemical composition (Na+, K+, Mg++, Ca++, SO4--, CO3--, HCO3-) were monitored to estimate the ion balance. At the end of each crop season, the ion input into the soil was higher than the output for soybean and sugar beet and equal for wheat.
Subject Headings: Irrigation | Crops | Soil water | Clays | Salt water | Measuring instruments | Seasonal variations | Drainage | North America | Italy | Colorado | Europe | United States
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