Effects of farmyard manure compost and biodynamic preparations

Long-term trial at IBDF Darmstadt (since 1980)


Design: 9 treatments (3 types of fertilizer at 3 levels) with 4 replicates; split block design

1. factor: type of fertilizer CM cattle manure (composted)*
CMBD cattle manure (composted) with all biodynamic preparations (500 and
 501 sprayed on the plots, 502-507 applied to the manure) *
MIN mineral fertilizer (calcium ammonium nitrate, super phosphate, potassium chloride, since 1996 potassium magnesia)
2. factor: rate of fertilizer application
low  50% of medium
medium according to normal farming practice
high  150% of medium
The levels depended upon the particular focus of each period (see below).
* From 1980 to 1984 and in 1988 and 1989 supplemented in single cases by liquid manure, castor or horn meal; since 1990 in each year liquid manure was used as second N portion to cereals.


Experimental periods and research focuses:


  1980 - 1984 1988 - 1991 1992 - 1999 ab 2000
Research focus Food Quality Soil biology Yield formation and long-term effects Stability of soil organic matter level with changed fertilization

Scientific head

Dr. Ulf Abele Dr. Johann Bachinger Dr. Joachim Raupp [1] Dr. Joachim Raupp
Calculation basis of fertilizer amounts Equivalent yields in CM and MIN
(fertilizer amounts [2])
same N amounts in CM, CMBD and MIN
(fertilizer amounts [3])
same N amounts in CM, CMBD and MIN
(fertilizer amounts [4])
as before at the medium level
Crop rotation Carrots
Winter rye
Red clover (alfalfa)
Spring wheat
Potatoes (carrots)
Winter rye
Red clover
 (Pers. clover)
Spring wheat
Winter rye
as before
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