Abstract
Abstract The effects of catch crops on the nitrogen nutrition of a succeeding carrot crop were investigated. An attempt was made to distinguish the effects of growth and nitrogen uptake by the catch crop from the effect of mineralization of its residues. It was found that growth and nitrogen uptake by catch crops could reduce the nitrogen supply to the succeeding carrot crop through pre-emptive competition, whereas mineralization of nitrogen from the catch crop residues increased the nitrogen supply to the carrot crop. Nitrogen uptake by the carrots was thus highest where catch crop residues were incorporated on plots where no catch crop had been grown. The effect of the mineralization was found mainly to influence topsoil mineral nitrogen contents and the early nitrogen uptake by carrots, whereas the effect of pre-emptive competition was to reduce subsoil mineral nitrogen content and the nitrogen uptake by carrots late in the growing season. The apparent recovery of catch crop nitrogen by carrots was between 8 and 33%.
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Claims 8
Claim · model-written summary
Growth and nitrogen uptake by catch crops reduced nitrogen supply to a succeeding carrot crop.
- Taxon
- carrot crop
Daucus carotae0 - Treatment
- growth and nitrogen uptake by catch cropse0
- Outcome
- nitrogen supplye0
- Direction
- reducee0
- Qualifier
- pre-emptive competitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth and nitrogen uptake by catch crops could reduce the nitrogen supply to the succeeding carrot crop through pre-emptive competition”
Claim · model-written summary
Mineralization of catch crop residues increased nitrogen supply to carrots.
- Taxon
- carrot cropDaucus carotae0
- Treatment
- mineralization of nitrogen from the catch crop residuese0
- Outcome
- nitrogen supplye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mineralization of nitrogen from the catch crop residues increased the nitrogen supply to the carrot crop”
Claim · model-written summary
Carrot nitrogen uptake was highest when catch crop residues were added to plots without prior catch crop growth.
- Taxon
- carrotsDaucus carotae0
- Treatment
- catch crop residues were incorporatede0
- Outcome
- Nitrogen uptakee0
- Direction
- higheste0
- Comparator
- no catch crop had been growne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen uptake by the carrots was thus highest where catch crop residues were incorporated on plots where no catch crop had been grown”
Claim · model-written summary
Residue mineralization mainly influenced topsoil mineral nitrogen.
Not reportedTaxon
Verbatim
e0“The effect of the mineralization was found mainly to influence topsoil mineral nitrogen contents”
Claim · model-written summary
Residue mineralization mainly influenced early carrot nitrogen uptake.
- Taxon
- carrotsDaucus carotae0
- Outcome
- early nitrogen uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the early nitrogen uptake by carrots”
Claim · model-written summary
Pre-emptive competition reduced subsoil mineral nitrogen.
Not reportedTaxonComparator
Verbatim
e0“the effect of pre-emptive competition was to reduce subsoil mineral nitrogen content”
Claim · model-written summary
Pre-emptive competition reduced late-season nitrogen uptake by carrots.
- Taxon
- carrotsDaucus carotae0
- Treatment
- pre-emptive competitione0
- Outcome
- nitrogen uptakee0
- Direction
- reducee0
- Qualifier
- late in the growing seasone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of pre-emptive competition was to reduce subsoil mineral nitrogen content and the nitrogen uptake by carrots late in the growing season”
Claim · model-written summary
Carrots recovered 8 to 33% of catch crop nitrogen.
- Taxon
- carrotsDaucus carotae0
- Outcome
- apparent recovery of catch crop nitrogene0
- Value
- 8 and 33%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The apparent recovery of catch crop nitrogen by carrots was between 8 and 33%”
The same questions in other papers
organic · nutrient: content · Daucus carota (carrot)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.