Abstract
There is an urgent need for better management practices regarding livestock farm nutrient imbalances and for finding alternatives to the actual use of mineral fertilizers. Acidification of animal manure is a mitigation practice used to reduce ammonia emissions to the atmospheric environment during manure storage and land application. Acidification modifies manure physicochemical characteristics, among which soluble N and P significantly increase. The main objective of this study was to investigate if acidification and the addition of a nitrification inhibitor to manure and placement of the treated manure close to the seed can stimulate maize growth by enhancing nutrient availability, specially P and consequently plant P uptake, at early development stages without the use of mineral N and P as a starter fertilizer. Raw dairy slurry and solid fractions from dairy slurry and digestate from a biogas plant were acidified to pH 5.5 and applied with or without a nitrification inhibitor (DMPP, 3,4-dimethyl pyrazole phosphate) to maize in a pot experiment, where biomass productivity, nutrient uptake and soil P availability were examined. Acidification increased the water-extractable P fraction of all slurry and digestate organic residues (by 20–61% of total P) and consequently plant P uptake from solid fractions of both slurry and digestate compared to the untreated products (by 47–49%). However, higher plant biomass from acidification alone was only achieved for the slurry solid fraction, while the combination of acidification and DMPP also increased plant biomass in the digestate solids treatment (by 49%). We therefore conclude that the combination of acidification and a nitrification inhibitor can increase the starter fertilizer value of slurry and digestate products sufficiently to make them suitable as a maize starter fertilizer.
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Claims 5
Claim · model-written summary
Acidification raised water-extractable P in slurry and digestate residues by 20–61% of total P.
- Treatment
- Acidificatione0
- Outcome
- water-extractable P fraction of all slurry and digestate organic residuese0
- Direction
- increasede0
- Value
- 20–61% of total Pe0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acidification increased the water-extractable P fraction of all slurry and digestate organic residues (by 20–61% of total P)”
t0“Maize”
Claim · model-written summary
Acidification increased maize P uptake from slurry solids by 47–49% relative to untreated products.
- Treatment
- Acidificatione1
- Outcome
- plant P uptake from solid fractions of both slurry and digestatee0
- Direction
- increasede1
- Value
- 47–49%e0
- Comparator
- untreated productse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant P uptake from solid fractions of both slurry and digestate compared to the untreated products (by 47–49%)”
e1“Acidification increased the water-extractable P fraction of all slurry and digestate organic residues”
t0“Maize”
Claim · model-written summary
Acidification alone increased maize biomass only with slurry solid fraction.
- Treatment
- acidification alonee0
- Outcome
- plant biomasse0
- Direction
- highere0
- Qualifier
- slurry solid fractione0
Not reportedMaterialComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher plant biomass from acidification alone was only achieved for the slurry solid fraction”
t0“Maize”
Claim · model-written summary
Acidification with DMPP increased maize biomass under digestate solids by 49%.
- Treatment
- combination of acidification and DMPPe0
- Outcome
- plant biomasse0
- Direction
- increasede0
- Value
- 49%e0
- Qualifier
- digestate solids treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the combination of acidification and DMPP also increased plant biomass in the digestate solids treatment (by 49%)”
t0“Maize”
Claim · model-written summary
The authors conclude that acidification with a nitrification inhibitor can make slurry and digestate suitable maize starter fertilizers.
- Treatment
- combination of acidification and a nitrification inhibitore0
- Outcome
- make them suitable as a maize starter fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the combination of acidification and a nitrification inhibitor can increase the starter fertilizer value of slurry and digestate products sufficiently to make them suitable as a maize starter fertilizer”
The same questions in other papers
ph · growth · Zea mays (maize)Results differ
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See all 20 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.