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Effects of farmyard manure compost and biodynamic preparations

Long-term trial at IBDF Darmstadt (since 1980)


since 1992 Potatoes

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


Results of degradation tests with potatoes cultivated with composted manure (CM, CMBD) and mineral fertilizer (MIN); Sabiwalski (1995)
  CM CMBD MIN low medium high
deg 10 ¹
deg 14
29.4
35.6
23.7
32.1
26.6
37.4
25.7
30.5
26.6
37.6
27.4
36.9
ext 48 ² 71.67 b 65,2 b 105.31a 75.82 a 80.36 ab 86.01 b
cond 1 ³
cond 3
cond 9
689
1158 ab
1272
689
1117 b
1258
718
1239 a
1331
652 a
1105
1206 a
719 b
1203
1318 b
725 b
1205
1337 b
¹ degradation after 10 and 14 days (% DM loss)
² extract darkening (extinction after 48 hours)
³ electrical conductivity (µS/cm) after 1, 3 and 9 days

Some degradation tests found a greater durability of organically fertilized potatoes.
As in the first period, darkening of crude extract from manure fertilized potatoes was weaker than with mineral fertilization. Electrical conductivity of the extract was also lower with the organic samples.
 
Both parameters deteriorated with increasing fertilization levels.
 
The most simple parameter that can be determined in a degradation test, namely dry matter loss, showed no effects of fertilization.

 

 

 

 

 

 

 
 
  
Extinction of potato extract with composted manure (CM), manure with biodynamic preparations (CMBD) and with mineral fertilization (MIN), evaluated for 48 hrs. in November 1999  

Extract darkening was investigated in later years, too. The extract of manure fertilized tubers had a lower extinction than the tubers grown with mineral fertilizer. This difference occurred immediately at the beginning of the test with the fresh extract (E0) as well as during the following two days (after 24 hours, E24; after 48 hours, E48) when darkening continued with all samples, but to different extents. While increasing manure levels reduced darkening, higher rates of mineral fertilizer intensified the dark colour. The figures show the results of November 1999 as an example. Similar results were obtained in the three years 1997, 1998 and 1999.


 

 

Note:
A literature summary of results with an evaluation of pros and cons of degradation tests has been published by: RAUPP, J. (1998): Examination of some microbiological and biochemical parameters and tests of product quality used in a long-term fertilization trial. Amer. J. Alternative Agric. 13, 138-144

Click here for brief information on the methods of degradation tests.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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