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Termine

Effects of farmyard manure compost and biodynamic preparations

Long-term trial at IBDF Darmstadt (since 1980)

since 1992 Red clover

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

Magnesium is an essential nutrient for plants and animals. On the significance of magnesium in human nutrition, particularly for people suffering from allergies, see for example WANGEMANN, M. (1994), Einfluß einer Magnesium-Supplementierung auf den Magnesiumstatus und die Symptome von Probanden mit saisonaler allergischer Rhinitis. Diss. Univ. Gießen.

**Plant available magnesium in the soil and magnesium contents in red clover (means of 4 cuts per year) with composted manure (CM, CMBD) and mineral (MIN) fertilization, Raupp (1999)**
	Mg in soil (mg 100 g^-1)				Mg in red clover (% DM)
	CM	CMBD	MIN	av.	CM	CMBD	MIN	av.
low medium high av.	7.7 8.6 8.9 8.4 b	8.3 8.9 8.9 8.7 b	6.3 6.3 6.8 6.5 a	7.4 a 7.9 b 8.2 b	0.45 0.42 0.41 0.43 b	0.46 0.44 0.42 0.44 b	0.40 0.38 0.36 0.38 a	0.44 b 0.41 a 0.40 a
Mean values of a factor with different letters are significantly different (p<0.05).

With manure fertilization, Mg contents in soil and clover were higher.

Although magnesium application with fertilizers was slightly lower in the organic than in the mineral treatment (15 instead of 20 kg ha^-1 Mg at the medium level), more plant available magnesium has been analysed in the manure fertilized soil. The above ground clover parts also contained more Mg in the organic than in the mineral treatments.

Note:
In this trial the legume crop always remains unfertilized in all treatments. Only the biodynamic preparations horn manure and horn silica were used in the CMBD treatment. The last organic and mineral fertilization was applied to the preceding rye crop.

**Red clover yield and magnesium uptake in the crop rotation with composted manure (CM, CMBD) and mineral fertilizer (MIN), means of four cuts; Raupp (1999)**
	Yield (dt ha^-1 DM)				Mg-uptake (kg ha^-1)
	CM	CMBD	MIN	Av.	CM	CMBD	MIN	Av.
low medium high Av.	62.2 69.1 71.8 67.7	60.4 65.7 72.7 66.3	58.6 64.5 68.7 63.9	60.4 a 66.4 b 71.1 c	28.0 29.2 30.0 29.1 b	28.0 28.8 30.4 29.1 b	23.6 24.4 25.1 24.4 a	26.6 a 27.5 ab 28.5 b
Mean values of a factor with different letters are significantly different (p<0.05).

Clover grown in the manure fertilized crop rotation will be a feedstuff richer in magnesium.

Mg uptake has been higher in the organic treatments owing to the higher Mg content in the clover plants in combination with a trend towards higher yields.

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