Potassium leaching following silage maize on a productive sandy soil
2012
Kayser, M., Georg-August Univ., Goettingen (Germany). Grassland Science | Benke, M., Chamber of Agriculture Lower-Saxony, Oldenburg (Germany) | Isselstein, J., Georg-August Univ., Goettingen (Germany). Grassland Science
Relatively little is known about potassium leaching losses following harvest of silage maize. The effects of fertilizer forms (inorganic, cattle slurry and pig slurry) and four levels of N input (0, 80, 160, 240 kg N/ha) with corresponding amounts of K on the nutrient balances and leaching of K from silage maize grown on a sandy soil were investigated using suction cups during a four-year field experiment. After four years, surplus of K from cattle slurry led to higher lactate-soluble K in the topsoil. Potassium leaching differed between years with different amounts of rainfall during winter. Annual leaching losses of K increased with N and K input and amounted to 38 kg K/ha, while fertilizer form had no significant effect. Losses of K increased with increasing N leaching (R2 = 0.69). We conclude that in maize production on coarse textured soils and under conditions of high N leaching (86-152 kg N/ha), K leaching can be large (6-84 kg K/ha) and constitutes a relevant part of K balances (-84 to +127 kg K/ha).
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