Abstract
To improve the efficiency of nitrogen (N) fertilization, it is necessary to perform rapid direct measurements in the field rather than time-consuming laboratory-based chemical analysis. Herein, crop and soil data from the early stages of cabbage growth were acquired through two fall cultivations. Chlorophyll meter value, height, and projected leaf area were evaluated as crop indicators. A positive correlation was observed between the projected leaf area or its rate of increase 2–3 weeks after transplantation and head fresh weight (FW). After comparing two water-content reflectometers (WCR) and a nitrate sensor, we selected a WCR with a 12 cm-long rod as the soil indicator. The diagnostic method was verified using varying amounts of N basal fertilizer during spring cultivation. The variable rate of N top dressing (25, 50, and 75% total N) based on the electrical conductivity (EC) 14 days after transplantation reduced the subsequent EC variability. No differences in head FW were observed between the treatments. A 25% reduction in N fertilizer was considered possible for half of the plots. The quantity of inorganic N extracted by potassium chloride from the crop soil after cultivation was unaffected by the amount of N fertilizer. Therefore, the diagnostic method proposed herein is suitable for soil N management.
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Claims 7
Claim · model-written summary
Projected leaf area or its increase correlated positively with head fresh weight.
- Taxon
- cabbage
Brassica oleracea var. capitatae1 - Organ / stage
- projected leaf areae0
- Outcome
- head fresh weight (FW)e0
- Direction
- positive correlatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positive correlation was observed between the projected leaf area or its rate of increase 2–3 weeks after transplantation and head fresh weight (FW)”
e1“cabbage growth”
Claim · model-written summary
A reflectometer with a 12 cm rod was selected as the soil indicator.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Outcome
- soil indicatore0
- Value
- 12 cm-longe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“selected a WCR with a 12 cm-long rod as the soil indicator”
e1“cabbage growth”
Claim · model-written summary
Variable nitrogen top dressing reduced later soil electrical conductivity variability.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- variable rate of N top dressing (25, 50, and 75% total N)e0
- Outcome
- subsequent EC variabilitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“variable rate of N top dressing (25, 50, and 75% total N) based on the electrical conductivity (EC) 14 days after transplantation reduced the subsequent EC variability”
e1“cabbage growth”
Claim · model-written summary
Head fresh weight did not differ among treatments.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- treatmentse0
- Outcome
- head FWe0
- Direction
- No differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences in head FW were observed between the treatments”
e1“cabbage growth”
Claim · model-written summary
A 25% nitrogen fertilizer reduction was considered feasible for half the plots.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Outcome
- 25% reduction in N fertilizere0
- Qualifier
- half of the plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 25% reduction in N fertilizer was considered possible for half of the plots”
e1“cabbage growth”
Claim · model-written summary
Extractable soil inorganic nitrogen after cultivation was unaffected by fertilizer amount.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Treatment
- amount of N fertilizere0
- Outcome
- quantity of inorganic N extracted by potassium chloride from the crop soil after cultivatione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quantity of inorganic N extracted by potassium chloride from the crop soil after cultivation was unaffected by the amount of N fertilizer”
e1“cabbage growth”
Claim · model-written summary
The diagnostic method was judged suitable for soil nitrogen management.
- Taxon
- cabbageBrassica oleracea var. capitatae1
- Outcome
- suitable for soil N managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diagnostic method proposed herein is suitable for soil N management”
e1“cabbage growth”
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