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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)

Roggenerträge Minerally 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) *
Fertilization type		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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