1 Department of Agroecology - Soil Fertility, Department of Agroecology, Science and Technology, Aarhus University2 The Danish AgriFish Agency, Ministery of Food, Copenhagen3 Plante- og Jordvidenskab4 Department of Agroecology - Soil Fertility, Department of Agroecology, Science and Technology, Aarhus University
Accumulation of phosphorus (P) in agricultural soils has caused increasing environmental concerns. Maize cropped for fodder implies return of animal manures rich in nutrients. In addition, starter fertilization with mineral P is used in cold conditions for maize cropping. It was hypothesized that the use of the additional mineral P could be excluded by increased availability of the P applied by animal manures. In a growth chamber experiment we investigated the effect of acidified slurry on the growth and nutrient uptake in maize seedlings. In special designed pot the slurries and mineral reference treatments were banded next to the seed row. Plants were harvested on nine dates with 4-6 days interval and an exponential growth function was fitted to the recordings. The P-uptake from acidified cattle slurry was clearly increased compared to raw slurry, and comparable to the mineral P-reference treatment. The effect of untreated raw slurry was similar to the mineral reference without P.