cattle slurry

Bijeenkomst: EGF2015
Auteur: Kykkänen S., Virkajärvi P., Hyrkäs M., Järvenranta K., Kurki P. and Suomela R.
ISBN: 978-9090-289-61-8
Jaar van uitgifte: 2015
Producttype: Paper
In Finland, grass yield response to potassium (K) fertilization varies with soil acid-extractable potassium (KHCl) availability, rather than the traditionally used measure of soil acid ammonium acetate-extractable potassium (KAAc). However, in previous experiments, no animal manure was used and grass nutritive value was only partially taken into account. The objective of this experiment was to measure the effects of cattle slurry, mineral K-fertilization (0, 50, 100, 150, 200 kg ha‑1 year‑1) and their interaction on grass (Phleum pratense – Festuca pratensis) dry matter (DM) production and nutritional value (organic matter digestibility, K concentration, Diet Cation Anion Difference = DCAD, grass tetany index) under three different levels of soil KHCl. Three-year field experiments were established at three locations: site 1, 2 and 3. The study was carried out as a split plot experiment. KHCl concentration of soil did not entirely explain the utilization of potassium by grass. Mineral K fertilization, given as KCl, decreased nutritional value of forage except for DCAD, on which Cl has a strong positive effect. K uptake was more effective without slurry application especially on soils with low and medium levels of KHCl.

Bijeenkomst: EGF2015
Auteur: Tampere M., Kauer K., Keres I., Parol A., Pitk P., Selge A., Viiralt R. and Raave H.
ISBN: 978-9090-289-61-8
Jaar van uitgifte: 2015
Producttype: Paper
The of production biogas from cattle slurry is increasing in Estonia, but there is not enough information about the efficiency of using its by-product digestate as grassland fertilizer. Therefore a farm experiment was conducted to study the impact of cattle slurry digestate, undigested (raw) cattle slurry and inorganic compound fertilizer on grassland yield. Organic fertilizers were applied in amounts to provide 25 kg ha‑1 P yr‑1. The application rates of cattle slurry digestate and cattle slurry provided 80.7 and 61.1 kg NH4 +-N ha‑1 yr‑1 respectively, and the mineral compound fertilizer was 80 kg N ha‑1 yr‑1. Grass yield was measured three times in the growing period. Our research showed that NH4 +-N from cattle slurry digestate was not as effective as N from mineral fertilizer. Despite the higher NH4 +-N application amount with digestate its yield was similar to the cattle slurry treatment.