home    about    browse    search    latest    help 
Login | Create Account

Phosphor- und Kalium-Bilanzen über 35 Jahre DOK-Versuch & geschätzte K-Nachlieferungsraten auf einem Lössboden

Downloads

Downloads per month over past year

Jarosch, KA.; Gunst, Lucie; Dubois, David; Mäder, Paul and Mayer, Jochen (2017) Phosphor- und Kalium-Bilanzen über 35 Jahre DOK-Versuch & geschätzte K-Nachlieferungsraten auf einem Lössboden. Paper at: 14. Wissenschaftstagung Ökologischer Landbau, Campus Weihenstephan, Freising-Weihenstephan, 07.-10. März 2017.

[img]
Preview
PDF - German/Deutsch
446kB

Summary

We calculated a phosphorus (P) and potassium (K) balance for the DOK-trial (Therwil, Switzerland) for a 35-years cropping period. In the DOK-trial, three cropping systems (D: biodynamic, O: bioorganic and K: conventional) are maintained on both a full (2) and a halved (1) fertilization level. Additionally, a treatment with no fertilization (N) and mineral fertilization (M; since 1985) are included. Balance inputs included fertilization, deposition, nutrients inputs by seeds, while in the outputs removal of nutrients by harvested plant material and leaching was considered. For P, the balance was positive for treatment M and treatment O2, but negative for the other treatments. The K-balance was positive only for treatment M, while treatments D2, O2 and K2 showed a slightly negative K-balance. In general, extensively maintained treatments on the halved fertilization level as well as treatment N show a negative P and K-Balance. Due to relatively constant K-concentrations and K-removal by crops in treatment N for the last 3 cropping periods (7 years each) we estimated a supply potential of K from loess soil of approximately 50 kg/ha * yr.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:Phosphorous balance, potassium balance
Subjects: Soil > Soil quality
Soil > Nutrient turnover
Research affiliation: Switzerland > Agroscope
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland
International Conferences > 2017: Scientific Conference German Speaking Countries > Soil fertility
Switzerland > Other organizations
ISBN:978-3-89574-925-4
Deposited By: Hasreiter, Anna
ID Code:31861
Deposited On:04 Jul 2017 17:22
Last Modified:04 Jul 2017 17:22
Document Language:German/Deutsch
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Dieser Beitrag ist im Tagungsband der 14. Wissenschaftstagung erschienen.
S. Wolfrum, H. Heuwinkel, H.J. Reents, u.a. (Hrsg.) (2017): Ökologischen Landbau weiterdenken - Verantwortung übernehmen - Vertrauen stärken. Beiträge der 14. Wissenschaftstagung Ökologischer Landbau, Freising-Weihenstephan, 7.-10. März 2017
Verlag Dr. Köster, Berlin

Repository Staff Only: item control page