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Effects of farmyard manure compost and biodynamic preparations

Long-term trial at IBDF Darmstadt (since 1980)

1988-1991 Growth and yield of winter rye

Second period (research focus: Soil biology)

Reference: BACHINGER (1996)

RoggenerträgeMinerally fertilized rye always delivered higher yields.
Manure fertilization (CM, CMBD) achieved on average 65% of the MIN yield. The clear differences in several soil biological characteristics between organic and mineral fertilization as well as between the manure treatments with and without preparations evidently had no effect on yield.
Higher amounts of fertilizer also increased yields.
Straw yields exhibited a similar pattern.





Root mass and density of winter rye in topsoil and subsoil as a function of manure fertilization with (CMBD) and without (CM) biodynamic preparations and as a function of mineral fertilizer (MIN), April 1990; averages of 3 fertilization intensities (Bachinger, 1996) *

Topsoil: Subsoil:
Amount rel. to MIN Amount rel. to MIN
Ash free root
mass 1
CM              0.125 a 103 0.018 ab 120
CMBD  0.140 a 115 0.021 b 140
MIN  0.122 a 100 0.015 a 100
Root density 2 CM         400.4 a 119 35.2 a 86
CMBD 499.3 b 148 67.3 b 165
MIN 337.8 a 100 40.8 a 100
1 grams per 1000 cm3; topsoil: 0 - 30 cm; subsoil: 30 - 60 cm
2 roots per 100 cm2; topsoil: 0 - 25 cm; subsoil: 25 - 55 cm
* Mean values with different letters within a soil horizon are significantly
  different (p<0.05).

Root densities in topsoil and subsoil were higher in the treatment with biodynamic preparations.

Additionally, root mass in subsoil was increased by manure with preparations compared to mineral fertilizer. There was no difference in both parameters between manure without preparations and mineral fertilization.
An earlier study also found root growth in subsoil to be more dense in the treatment with preparations (Meuser, 1989).
Thus, root growth responded differently than above ground plant biomass, the latter having been stimulated by mineral fertilization.


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