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11.02.2009
10. Wissenschaftstagung Ökologischer Landbau

Effects of farmyard manure compost and biodynamic preparations

Long-term trial at IBDF Darmstadt (since 1980)

scince 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**
		low					medium					high
		N	P₂O₅	K₂O	S	Mg	N	P₂O₅	K₂O	S	Mg	N	P₂O₅	K₂O	S	Mg
CM	manure	60	36	91	9	10	80	48	122	12	15	100	60	152	15	20
CM	liquid manure	-	-	-	-	-	20	1	40	-	-	40	3	79	-	-
CMBD	manure	60	39	98	9	10	80	52	130	11	15	100	65	163	14	20
CMBD	liquid manure	-	-	-	-	-	20	2	40	-	-	40	3	78	-	-
MIN	1st application	60	50	75	73	15	80	75	100	102	20	100	100	125	132	25
MIN	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**
		low					medium					high
		N	P₂O₅	K₂O	S	Mg	N	P₂O₅	K₂O	S	Mg	N	P₂O₅	K₂O	S	Mg
CM CMBD	manure	50	30	76	8	9	100	60	152	15	20	150	90	228	23	28
CM CMBD	manure	50	33	82	7	10	100	65	163	14	20	150	98	245	21	30
MIN		50	60	150	122	30	100	90	200	168	40	150	120	250	215	50

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