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Effects of farmyard manure compost and biodynamic preparations

Long-term trial at IBDF Darmstadt (since 1980)


since 1992 Fertilizer and nutrient amounts

Third period (research focus: Yield formation and long-term effects)


As in the second period, the amounts of all fertilizers were calculated on the basis of their total nitrogen contents. At each fertilization level (low, medium, high) the same nitrogen amount was applied with organic and mineral fertilizer.

Nutrient amounts (kg ha-1) applied yearly with composted manure without (CM) and with (CMBD) biodynamic preparations and with mineral fertilizer (MIN) to cereals (P, K, S and Mg amounts in CM and CMBD are averages of the years 1994-98)
 
low
medium
high
N P K S Mg N P K S Mg N P K S Mg
CM
 
manure 60 16 76 9 10 80 21 101 12 15 100 26 126 15 20
liquid manure - - - - - 20 <1 33 - - 40 1 66 - -
CMBD 
 
manure 60 17 81 9 10 80 23 108 11 15 100 28 135 14 20
liquid manure - - - - - 20 1 33 - - 40 1 65 - -
MIN
 
1st application 60 22 62 73 15 80 33 83 102 20 100 44 104 132 25
2nd application - - -  - - 20 - - - - 40 - - - -

Because fertilizer amounts were calculated on the basis of nitrogen contents alone, the amounts of phosphorus and potassium applied in the manure treatments varied from year to year depending upon the manure properties in a given year. The data presented in the table for CM and CMBD are averages of several years; in MIN the same amounts were applied every year.
 
Application dates:
To winter rye, manure was applied before sowing and mineral fertilizer in early spring. The second N application was during heading. To spring wheat, manure and mineral fertilizer was applied before sowing, the second time during stem elongation. The second application was calcium ammonium nitrate in MIN and liquid manure in CM and CMBD. Potatoes were fertilized before planting out. The legume crop remained unfertilized - only the horn manure and horn silica preparations were sprayed in CMBD treatment.

Nutrient amounts (kg ha-1) applied yearly with composted manure without (CM) and with (CMBD) preparations and with mineral fertilizer (MIN) to potatoes (P, K, S and Mg amounts in CM and CMBD are averages of the years 1994-98)
 
low
medium
high
N P K S Mg N P K S Mg N P K S Mg
CM
CMBD
manure 50 13 63 8 9 100 26 126 15 20 150 39 189 23 28
manure 50 14 68 7 10 100 28 135 14 20 150 43 203 21 30
MIN 50 26 125 122 30 100 39 166 168 40 150 52 208 215 50
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