Abstract
The study investigates the effects of nitrogen fertilizers on the characteristics of the autumn crop of Chinese cabbage.The rates applied varied from 0 to 225 kg ha (1 (N 0 , N 45 , N 90 , N 135 , N 180 , N 225 ); the supply of phosphorus and potassium fertilizers was similar in the all trials, 90 and 150 kg ha (1 , respectively.It was found that the optimum nitrogen fertilization rate for the autumn crop of Chinese cabbage was N 135 .In the case of lower nitrogen rates the yield decreased and the cabbage heads were smaller.Further increase in fertilizer rate ( N 135 ) resulted in a higher percentage of non-standard cabbage heads, while the yield remained almost unchanged compared with N 135 .The total plant mass of cabbage crop fertilized with N 135 was 76 t ha (1 ; plant residues constituted 33 t ha (1 (43% of the total mass).The yield of market quality cabbage heads was 30 t ha (1 (70% of all the heads produced); the rest of heads were loose, not formed or rot-infected.The optimal amount of total mineral nitrogen (the sum of nitrogen present in the 060 cm soil layer and the nitrogen supplied with fertilizers) before planting was 260 kg ha (1 .When nitrogen rates were higher than N 180 the quality of cabbage heads in terms of the content of vitamin C, nitrates, soluble solids, total solids and sugars decreased.
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Claims 11
Claim · model-written summary
N 135 was the optimum rate for autumn Chinese cabbage.
- Taxon
- Chinese cabbage
Brassica rapa subsp. pekinensise0 - Treatment
- N 135e0
- Outcome
- optimum nitrogen fertilization ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“optimum nitrogen fertilization rate for the autumn crop of Chinese cabbage was N 135”
Claim · model-written summary
Lower nitrogen rates decreased yield.
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensist0
- Treatment
- lower nitrogen ratese0
- Outcome
- yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the case of lower nitrogen rates the yield decreased”
t0“Chinese cabbage heads”
Claim · model-written summary
Lower nitrogen rates produced smaller heads.
- Taxon
- cabbage
Brassica oleracea var. capitatae0 - Treatment
- lower nitrogen ratese0
- Outcome
- cabbage headse0
- Direction
- smallere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the case of lower nitrogen rates the yield decreased and the cabbage heads were smaller”
Claim · model-written summary
Further fertilizer increase raised the share of non-standard heads.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- Further increase in fertilizer ratee0
- Outcome
- percentage of non-standard cabbage headse0
- Direction
- highere0
- Comparator
- N 135e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further increase in fertilizer rate ( N 135 ) resulted in a higher percentage of non-standard cabbage heads”
Claim · model-written summary
Yield remained almost unchanged above N 135.
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensist0
- Outcome
- yielde0
- Direction
- almost unchangede0
- Comparator
- N 135e0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the yield remained almost unchanged compared with N 135”
t0“Chinese cabbage heads”
Claim · model-written summary
At N 135, total plant mass was 76 t ha (1.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- N 135e0
- Outcome
- total plant masse0
- Value
- 76 t ha (1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The total plant mass of cabbage crop fertilized with N 135 was 76 t ha (1”
Claim · model-written summary
At N 135, residues were 33 t ha (1, or 43% of total mass.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- plant residuese0
- Value
- 33 t ha (1e0
- Qualifier
- 43% of the total masse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant residues constituted 33 t ha (1 (43% of the total mass)”
t0“cabbage heads”
Claim · model-written summary
Market quality head yield was 30 t ha (1, or 70% of heads.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Outcome
- yield of market quality cabbage headse0
- Value
- 30 t ha (1e0
- Qualifier
- 70% of all the heads producede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of market quality cabbage heads was 30 t ha (1 (70% of all the heads produced)”
Claim · model-written summary
Remaining heads were loose, unformed, or rot-infected.
- Taxon
- cabbageBrassica oleracea var. capitatat0
- Outcome
- loose, not formed or rot-infectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rest of heads were loose, not formed or rot-infected”
t0“cabbage heads”
Claim · model-written summary
Optimal total mineral nitrogen before planting was 260 kg ha (1.
- Taxon
- Chinese cabbageBrassica rapa subsp. pekinensist0
- Outcome
- optimal amount of total mineral nitrogene0
- Value
- 260 kg ha (1e0
- Qualifier
- before plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimal amount of total mineral nitrogen (the sum of nitrogen present in the 060 cm soil layer and the nitrogen supplied with fertilizers) before planting was 260 kg ha (1”
t0“Chinese cabbage heads”
Claim · model-written summary
Above N 180, head quality in vitamin C, nitrates, soluble solids, total solids and sugars decreased.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- nitrogen rates were higher than N 180e0
- Outcome
- quality of cabbage heads in terms of the content of vitamin C, nitrates, soluble solids, total solids and sugarse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When nitrogen rates were higher than N 180 the quality of cabbage heads in terms of the content of vitamin C, nitrates, soluble solids, total solids and sugars decreased”
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