The effects of calcareous sapropel application on the changes of Haplic Luvisols chemical properties and crop yield
Baksiene, E.(Lithuanian Inst. of Agriculture, Vilnius (Lithuania). Voke Branch)E-mail:eugenija.baksiene@voke.lzi.lt | Janusiene, V.
From 1984 to 2002, several experiments were carried out on sandy loam Haplic Luvisols in fields with crop rotations (maize, barley, clover, winter rye, potatoes, oats) and application of 50, 100, 150, 200 t/ha rates of dry calcareous sapropel and 30 t/ha of dry manure on the background of mineral fertilisers. Sapropel was applied only to the first crop (maize) in the rotation (in 1984). Manure was applied to the first crop in each crop rotation (in 1984, 1990 and 1996). The effect of sapropel on soil chemical properties was positive as it reduced soil acidity, increased the amounts of exchangeable bases (Ca + Mg) and mobile P, as well as concentrations of organic C and total N. Humus composition was also improved. On the contrary, the level of mobile K decreased. After 18 years of application, dry sapropel (150, 200 t/ha) increased crop yields. At 200 t/ha it was almost of the same effectiveness as manure applied in every rotation.
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