Abstract
Abstract. The examinations were aimed at determining the dependence between form and rate of applied nitrogen fertilizer vs. yield and chemical composition of leaves of Swiss chard cultivated in greenhouse in spring. Nitrogen was applied in a form of urea, potas-sium nitrate, and ammonium nitrate at three amounts: 0.2; 0.4; 0.6 g N·dm-3 of substrate. Following items were assessed: yield, nutrients contents, as well as chemical analyses of substrate after plant harvest were made. Increase of nitrogen rate in objects with potas-sium nitrate and ammonium nitrate resulted in the decrease of fresh matter yield, while in objects with urea, the yield remained at constant level. The highest yield of above ground parts (356 g·plant-1) was achieved by fertilizing the plants with the lowest nitrogen rate (as ammonium nitrate). Contents of nitrates in leaf dry matter was within the range of 0.59–1.27 % depending on nitrogen rate and form. The highest nitrate levels were found when potassium nitrate was applied as fertilizer, whereas the lowest – when applying ammonium nitrate; however, regardless the fertilizer type, higher rates caused the increase of nitrate contents. Studies revealed that at increasing nitrogen concentration in a sub-
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Claims 8
Claim · model-written summary
Higher potassium nitrate rate decreased fresh yield.
- Taxon
- SWISS CHARD
Beta vulgaris subsp. vulgarist0 - Treatment
- potas-sium nitratee0
- Outcome
- fresh matter yielde0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase of nitrogen rate in objects with potas-sium nitrate and ammonium nitrate resulted in the decrease of fresh matter yield”
t0“SWISS CHARD”
Claim · model-written summary
Higher ammonium nitrate rate decreased fresh yield.
- Taxon
- SWISS CHARDBeta vulgaris subsp. vulgarist0
- Treatment
- ammonium nitratee0
- Outcome
- fresh matter yielde0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase of nitrogen rate in objects with potas-sium nitrate and ammonium nitrate resulted in the decrease of fresh matter yield”
t0“SWISS CHARD”
Claim · model-written summary
Yield remained constant across urea rates.
- Taxon
- SWISS CHARDBeta vulgaris subsp. vulgarist0
- Treatment
- ureae0
- Outcome
- yielde0
- Direction
- remained at constant levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in objects with urea, the yield remained at constant level”
t0“SWISS CHARD”
Claim · model-written summary
The lowest ammonium nitrate rate produced the highest aboveground yield, 356 g per plant.
- Taxon
- SWISS CHARDBeta vulgaris subsp. vulgarist0
- Treatment
- lowest nitrogen rate (as ammonium nitrate)e0
- Outcome
- yield of above ground partse0
- Direction
- higheste0
- Value
- 356 g·plant-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield of above ground parts (356 g·plant-1) was achieved by fertilizing the plants with the lowest nitrogen rate (as ammonium nitrate)”
t0“SWISS CHARD”
Claim · model-written summary
Leaf nitrate dry-matter content ranged 0.59–1.27%.
- Taxon
- SWISS CHARDBeta vulgaris subsp. vulgarist0
- Outcome
- Contents of nitrates in leaf dry mattere0
- Value
- 0.59–1.27 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Contents of nitrates in leaf dry matter was within the range of 0.59–1.27 % depending on nitrogen rate and form”
t0“SWISS CHARD”
Claim · model-written summary
Potassium nitrate gave the highest leaf nitrate levels.
- Taxon
- SWISS CHARDBeta vulgaris subsp. vulgarist0
- Treatment
- potassium nitratee0
- Outcome
- nitrate levelse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest nitrate levels were found when potassium nitrate was applied as fertilizer”
t0“SWISS CHARD”
Claim · model-written summary
Ammonium nitrate gave the lowest leaf nitrate levels.
- Taxon
- SWISS CHARDBeta vulgaris subsp. vulgarist0
- Treatment
- ammonium nitratee0
- Outcome
- CHEMICAL COMPOSITIONt0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lowest – when applying ammonium nitrate”
t0“CHEMICAL COMPOSITION OF SWISS CHARD”
Claim · model-written summary
Higher fertilizer rates increased nitrate content.
- Taxon
- SWISS CHARDBeta vulgaris subsp. vulgarist0
- Treatment
- higher ratese0
- Outcome
- nitrate contentse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“regardless the fertilizer type, higher rates caused the increase of nitrate contents”
t0“SWISS CHARD”
The same questions in other papers
ammonium nitrate · yield · Beta vulgaris (beet)Results agree
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141 papers in the same direction as this paper · 16 in the opposite direction · 3 reporting no difference from an alternative
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See all 161 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.