Adsorption of nutrients from pig slurry on expanded vermiculite
1994
Suhadolc, M. | Kadunc, V. | Lobnik, F. (Biotechnical Faculty, Ljubljana (Slovenia). Agronomy Dept.)
In this study the adsorption of nutrients from pig slurry on expanded vermiculite was investigated. Two types of vermiculite were used: South African and Russian, both with CEC 160-170 mmol/100g d.m. The measurements of adsorbed NH4+, K+ and Na+ were carried out after a saturation process lasting 2, 24 hours and 3, 8, 10 and 20 days. The influence of two different temperature regimes was also studied (20-25 deg C and 5-10 deg C). At higher saturation temperature the amount of adsorbed nitrogen was greater. The first 3 to 8 days of saturation were the most important for nitrogen adsorption. The nitrogen content of Russian vermiculite increased up to 129, and of South African up to 49 mmol/100g. The potassium and sodium content decreased in both vermiculites, most significant were the first two hours of saturation.
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