Abstract
The nutritional value of some vegetables may greatly vary depending on the cultivation method and kind of fertilization. In 2007–2009 there was conducted a field experiment to evaluate the effects of nitrogen fertilizers (ammonium nitrate, calcium nitrate, ammonium sulphate, urea, Entec-26) and their doses (80, 160 kgN·ha-1) on yielding and biological quality of two spinach cultivars (Spokane F1, Rembrandt F1) grown for autumn harvest. The use of Entec-26 fertilizer assured the highest mean marketable yield of spinach (12.25 t·ha-1). Comparable results were observed for ammonium sulphate and ammonium nitrate while lower yield was obtained in treatment supplied with calcium nitrate. The highest accumulation of nitrates and vitamin C was associated with the application of calcium nitrate and the lowest one with ammonium sulphate and Entec-26. An increase of the dose of fertilizer from 80 to 160 kg N·ha-1 did not significantly affect yielding of spinach and its nutritional value expressed by the content of dry matter, vitamin C and nitrates. Among the two cultivars, Rembrandt F1 produced higher yield of leaves and showed some tendency to a higher accumulation of nitrates, whereas lower content of dry matter and vitamin C. The levels of P, K, Mg and Ca were not dependent on the cultivar as well as kind and dose of nitrogen fertilizer.
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Claims 15
Claim · model-written summary
Entec-26 gave the highest mean marketable yield, 12.25 t·ha-1.
- Taxon
- spinach
Spinacia oleraceae0 - Treatment
- Entec-26 fertilizere0
- Outcome
- marketable yielde0
- Direction
- higheste0
- Value
- 12.25 t·ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of Entec-26 fertilizer assured the highest mean marketable yield of spinach (12.25 t·ha-1).”
Claim · model-written summary
Ammonium sulphate yielded results comparable with the highest yield treatment.
- Taxon
- spinachSpinacia oleraceae1
- Treatment
- ammonium sulphatee0
- Outcome
- marketable yielde1
- Direction
- Comparablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“Comparable results were observed for ammonium sulphate and ammonium nitrate”
e1“highest mean marketable yield of spinach”
Claim · model-written summary
Ammonium nitrate yielded results comparable with the highest yield treatment.
- Taxon
- spinachSpinacia oleraceae1
- Treatment
- ammonium nitratee0
- Outcome
- marketable yielde1
- Direction
- Comparablee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“Comparable results were observed for ammonium sulphate and ammonium nitrate”
e1“highest mean marketable yield of spinach”
Claim · model-written summary
Calcium nitrate produced lower marketable yield.
- Taxon
- SPINACHSpinacia oleraceat0
- Treatment
- calcium nitratee0
- Outcome
- yielde0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“lower yield was obtained in treatment supplied with calcium nitrate”
Claim · model-written summary
Calcium nitrate was associated with the highest nitrate accumulation.
- Taxon
- SPINACHSpinacia oleraceat0
- Treatment
- calcium nitratee0
- Outcome
- accumulation of nitratese0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“The highest accumulation of nitrates and vitamin C was associated with the application of calcium nitrate”
Claim · model-written summary
Calcium nitrate was associated with the highest vitamin C accumulation.
- Taxon
- SPINACHSpinacia oleraceat0
- Treatment
- calcium nitratee0
- Outcome
- vitamin Ce0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“The highest accumulation of nitrates and vitamin C was associated with the application of calcium nitrate”
Claim · model-written summary
Ammonium sulphate was associated with the lowest nitrate and vitamin C accumulation.
- Taxon
- SPINACHSpinacia oleraceat0
- Treatment
- ammonium sulphatee0
- Outcome
- accumulation of nitrates and vitamin Ce1
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“the lowest one with ammonium sulphate and Entec-26”
e1“accumulation of nitrates and vitamin C”
Claim · model-written summary
Entec-26 was associated with the lowest nitrate and vitamin C accumulation.
- Taxon
- SPINACHSpinacia oleraceat0
- Treatment
- Entec-26e0
- Outcome
- accumulation of nitrates and vitamin Ce1
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“the lowest one with ammonium sulphate and Entec-26”
e1“accumulation of nitrates and vitamin C”
Claim · model-written summary
Raising nitrogen dose from 80 to 160 kg N·ha-1 did not significantly affect yield.
- Taxon
- spinachSpinacia oleraceae0
- Treatment
- 160 kg N·ha-1e0
- Outcome
- yieldinge0
- Comparator
- 80e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“An increase of the dose of fertilizer from 80 to 160 kg N·ha-1 did not significantly affect yielding of spinach”
Claim · model-written summary
Raising nitrogen dose did not significantly affect dry matter, vitamin C or nitrate content.
- Taxon
- spinachSpinacia oleraceae0
- Treatment
- 160 kg N·ha-1e1
- Outcome
- content of dry matter, vitamin C and nitratese0
- Comparator
- 80e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“did not significantly affect yielding of spinach and its nutritional value expressed by the content of dry matter, vitamin C and nitrates”
e1“from 80 to 160 kg N·ha-1”
Claim · model-written summary
Rembrandt F1 produced higher leaf yield than Spokane F1.
- Taxon
- spinachSpinacia oleraceae1
- Material
- Rembrandt F1e0
- Outcome
- yield of leavese0
- Direction
- highere0
- Comparator
- Spokane F1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rembrandt F1 produced higher yield of leaves”
e1“two spinach cultivars (Spokane F1, Rembrandt F1)”
Claim · model-written summary
Rembrandt F1 tended toward higher nitrate accumulation.
- Taxon
- spinachSpinacia oleraceae2
- Material
- Rembrandt F1e1
- Outcome
- accumulation of nitratese0
- Direction
- highere0
- Qualifier
- some tendencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showed some tendency to a higher accumulation of nitrates”
e1“Rembrandt F1 produced higher yield of leaves”
e2“two spinach cultivars (Spokane F1, Rembrandt F1)”
Claim · model-written summary
Rembrandt F1 had lower dry matter content.
- Taxon
- spinachSpinacia oleraceae2
- Material
- Rembrandt F1e1
- Outcome
- content of dry mattere0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas lower content of dry matter and vitamin C”
e1“Rembrandt F1 produced higher yield of leaves”
e2“two spinach cultivars (Spokane F1, Rembrandt F1)”
Claim · model-written summary
Rembrandt F1 had lower vitamin C content.
- Taxon
- spinachSpinacia oleraceae2
- Material
- Rembrandt F1e1
- Outcome
- vitamin Ce0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas lower content of dry matter and vitamin C”
e1“Rembrandt F1 produced higher yield of leaves”
e2“two spinach cultivars (Spokane F1, Rembrandt F1)”
Claim · model-written summary
P, K, Mg and Ca levels did not depend on cultivar, nitrogen source or dose.
- Taxon
- SPINACHSpinacia oleraceat0
- Treatment
- nitrogen fertilizere0
- Outcome
- levels of P, K, Mg and Cae0
- Direction
- not dependente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SPINACH”
e0“The levels of P, K, Mg and Ca were not dependent on the cultivar as well as kind and dose of nitrogen fertilizer.”
The same questions in other papers
calcium nitrate · yield · Spinacia oleracea (spinach)Positive and negative results
2 in the opposite direction
- positive
- positive
fertilization · quality: postharvest · Spinacia oleracea (spinach)Results agree
3 papers in the same direction as this paper
- positive
- 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.