Abstract
Abstract In the present study, we investigated whether growth and main nutrient ion concentrations of cabbage ( Brassica campestris L.) could be increased when plants were subjected to different NH 4 + /NO 3 − ratios. Cabbage seedlings were grown in a greenhouse in nutrient solutions with five NH 4 + /NO 3 − ratios (1:0; 0.75:0.25; 0.5:0.5; 0.25:0.75; and 0:1). The results showed that cabbage growth was reduced by 87% when the proportion of NH 4 + ‐N in the nutrient solution was more than 75% compared with a ratio NH 4 + /NO 3 − of 0.5:0.5 35 d after transplanting, suggesting a possible toxicity due to the accumulation of a large amount of free ammonia in the leaves. When the NH 4 + /NO 3 − ratio was 0.5:0.5, fresh seedling weight, root length, and H 2 PO 4 − (P), K + , Ca 2+ , and Mg 2+ concentrations were all higher than those in plants grown under other NH 4 + /NO 3 − ratios. The nitrate concentration in the leaves was the lowest in plants grown at 0.5: 0.5 NH 4 + /NO 3 − . The present results indicate that an appropriate NH 4 + /NO 3 − ratio improves the absorption of other nutrients and maintains a suitable proportion of N assimilation and storage that should benefit plant growth and the quality of cabbage as a vegetable.
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Claims 7
Claim · model-written summary
Above 75% ammonium nitrogen reduced cabbage growth by 87% against an equal ammonium–nitrate ratio.
- Taxon
- cabbage
Brassica oleracea var. capitatae0 - Treatment
- proportion of NH 4 + ‐N in the nutrient solution was more than 75%e0
- Outcome
- cabbage growthe0
- Direction
- reducede0
- Value
- 87%e0
- Qualifier
- 35 d after transplantinge0
- Comparator
- ratio NH 4 + /NO 3 − of 0.5:0.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cabbage growth was reduced by 87% when the proportion of NH 4 + ‐N in the nutrient solution was more than 75% compared with a ratio NH 4 + /NO 3 − of 0.5:0.5 35 d after transplanting”
Claim · model-written summary
An equal ammonium–nitrate ratio gave higher fresh seedling weight and root length than other ratios.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- NH 4 + /NO 3 − ratio was 0.5:0.5e0
- Outcome
- fresh seedling weight, root lengthe0
- Direction
- highere0
- Comparator
- other NH 4 + /NO 3 − ratiose0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the NH 4 + /NO 3 − ratio was 0.5:0.5, fresh seedling weight, root length, and H 2 PO 4 − (P), K + , Ca 2+ , and Mg 2+ concentrations were all higher than those in plants grown under other NH 4 + /NO 3 − ratios.”
e1“cabbage ( Brassica campestris L.)”
Claim · model-written summary
An equal ammonium–nitrate ratio gave higher phosphate and potassium concentrations than other ratios.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- NH 4 + /NO 3 − ratio was 0.5:0.5e0
- Outcome
- H 2 PO 4 − (P), K +e0
- Direction
- highere0
- Comparator
- other NH 4 + /NO 3 − ratiose0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the NH 4 + /NO 3 − ratio was 0.5:0.5, fresh seedling weight, root length, and H 2 PO 4 − (P), K + , Ca 2+ , and Mg 2+ concentrations were all higher than those in plants grown under other NH 4 + /NO 3 − ratios.”
e1“cabbage ( Brassica campestris L.)”
Claim · model-written summary
An equal ammonium–nitrate ratio gave higher calcium and magnesium concentrations than other ratios.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- NH 4 + /NO 3 − ratio was 0.5:0.5e0
- Outcome
- Ca 2+ , and Mg 2+ concentrationse0
- Direction
- highere0
- Comparator
- other NH 4 + /NO 3 − ratiose0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the NH 4 + /NO 3 − ratio was 0.5:0.5, fresh seedling weight, root length, and H 2 PO 4 − (P), K + , Ca 2+ , and Mg 2+ concentrations were all higher than those in plants grown under other NH 4 + /NO 3 − ratios.”
e1“cabbage ( Brassica campestris L.)”
Claim · model-written summary
Leaf nitrate concentration was lowest at an equal ammonium–nitrate ratio.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- 0.5: 0.5 NH 4 + /NO 3 −e0
- Outcome
- nitrate concentration in the leavese0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrate concentration in the leaves was the lowest in plants grown at 0.5: 0.5 NH 4 + /NO 3 − .”
e1“cabbage ( Brassica campestris L.)”
Claim · model-written summary
The authors interpret an appropriate ammonium–nitrate ratio as improving absorption of other nutrients.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- an appropriate NH 4 + /NO 3 − ratioe0
- Outcome
- absorption of other nutrientse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an appropriate NH 4 + /NO 3 − ratio improves the absorption of other nutrients”
e1“cabbage as a vegetable”
Claim · model-written summary
The authors interpret an appropriate ratio as maintaining suitable nitrogen assimilation and storage.
- Taxon
- cabbageBrassica oleracea var. capitatae2
- Treatment
- an appropriate NH 4 + /NO 3 − ratioe1
- Outcome
- a suitable proportion of N assimilation and storagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maintains a suitable proportion of N assimilation and storage”
e1“an appropriate NH 4 + /NO 3 − ratio”
e2“cabbage as a vegetable”
The same questions in other papers
fertilization · growth · Brassica oleracea (wild cabbage)Positive and negative results
23 papers in the same direction as this paper · 240 in the opposite direction
- positive
- positive
- positive
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See all 264 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.