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Effects of biodynamic preparations on organic fertilizer


Biodynamic preparations improved yields in some experiments. However, the direct effect of the preparations on manure, rotted manure or slurry is unclear.

The composting process and some properties of farmyard manure heaps with and without  biodynamic preparations were studied. There was no effect of the preparations on redox potential and the respiration intensity (CO2 release). The temperature during composting was in both treatments similar as well. Only towards the end of composting, dehydrogenase activity slightly increased in the manure heaps with preparations (Carpenter-Boggs et al. (2000).


carpenter-boggsa

a)

  

Redox potential change (a), respiration (b) and dehydrogenase activity (c) in manure piles with and without bd preps.; average of 5 replicates with 4 measurements of each pile.

Carpenter-Boggs et al. (2000)

carpenter-boggsb

b)

  carpenter-boggsc

c)




However, phospholipid fatty acid patterns of piles treated with biodynamic preparations differed from control piles, indicating a different composition of their microbial community (Carpenter-Boggs et al. (2000).

carpenter-boggsd
Phospholipid fatty acid principal components 2 and 3 for final compost samples with and without bd preps.; data represents 4 subsamples of each pile with 4 replicates
Carpenter-Boggs et al. (2000) 

The temperature in the manure piles were almost the same during the composting period in both treatments.


carpenter-boggse
Temperature in dairy manure piles with and without bd preps.; average of 5 replicates with 4 measurements of each pile.
Carpenter-Boggs et al. (2000)


Reference:

CARPENTER-BOGGS, L.; REGANOLD, J.P.; KENNEDY, A.C. (2000): Effects of biodynamic preparations on compost development. Biol. Agric. & Hort., 17, 313-328

 


 
 

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