Abstract
As natural plant growth stimulators, amino acids are widely used to improve crop yield and quality. There are numerous studies documenting the influence of amino acids on plants, which is not always positive. This study was conducted to determine the effect of soil-applied L-tryptophan (L-TRP) on the accumulation and utilization of nitrogen and sulfur by maize. The study was carried out under the conditions of a pot experiment. The experimental design included three treatments: soil without fertilization (control), soil with mineral fertilization (NPKS), and soil with mineral fertilization and L-tryptophan addition (NPKS + L-TRP). The application of tryptophan to the soil, supported by mineral fertilization, caused a significant increase in maize biomass. Although no significant differences in nitrogen and sulfur contents in maize biomass were found between treatments without and with the addition of L-tryptophan, significantly higher intakes of both elements were observed in the NPKS + L-TRP treatment. The application of L-tryptophan increased the biosynthesis of Chlorophyll a. Utilization of nitrogen and sulfur by maize in the NPKS + L-TRP treatment was more than 27% and 17% higher, respectively, compared to the NPKS treatment. Maintaining the recommended contents of individual nutrients in the rhizosphere is not a guarantee of optimal quantitative and qualitative intake of nutrients. Problems with maintaining optimal relationships between individual nutrients may be compounded by soil properties.
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Claims 7
Claim · model-written summary
Adding tryptophan with mineral fertilizer significantly increased maize biomass.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of tryptophan to the soil, supported by mineral fertilization, caused a significant increase in maize biomass”
Claim · model-written summary
Nitrogen content did not significantly differ with L-tryptophan addition.
- Treatment
- addition of L-tryptophane0
- Outcome
- nitrogene0
- Direction
- no significant differencese0
- Comparator
- treatments withoute0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differences in nitrogen and sulfur contents in maize biomass were found between treatments without and with the addition of L-tryptophan”
Claim · model-written summary
Sulfur content did not significantly differ with L-tryptophan addition.
- Treatment
- addition of L-tryptophane0
- Outcome
- sulfur contentse0
- Direction
- no significant differencese0
- Comparator
- treatments withoute0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant differences in nitrogen and sulfur contents in maize biomass were found between treatments without and with the addition of L-tryptophan”
Claim · model-written summary
Nitrogen intake was significantly higher with L-tryptophan.
Not reportedTaxonComparator
Verbatim
e0“significantly higher intakes of both elements were observed in the NPKS + L-TRP treatment”
Claim · model-written summary
L-tryptophan increased chlorophyll a biosynthesis.
Not reportedTaxonComparator
Verbatim
e0“The application of L-tryptophan increased the biosynthesis of Chlorophyll a”
Claim · model-written summary
Nitrogen utilization was over 27% higher with NPKS plus L-TRP than NPKS alone.
- Treatment
- NPKS + L-TRP treatmente0
- Outcome
- Utilization of nitrogene0
- Direction
- highere0
- Value
- more than 27%e0
- Comparator
- NPKS treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Utilization of nitrogen and sulfur by maize in the NPKS + L-TRP treatment was more than 27% and 17% higher, respectively, compared to the NPKS treatment”
Claim · model-written summary
Sulfur utilization was over 17% higher with NPKS plus L-TRP than NPKS alone.
- Treatment
- NPKS + L-TRP treatmente0
- Outcome
- sulfure0
- Direction
- highere0
- Value
- 17%e0
- Comparator
- NPKS treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Utilization of nitrogen and sulfur by maize in the NPKS + L-TRP treatment was more than 27% and 17% higher, respectively, compared to the NPKS treatment”
The same questions in other papers
tryptophan · growth · Zea mays (maize)Positive and negative results
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- no effect
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L-tryptophan · physiology: pigments · Zea mays (maize)Results agree
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- positive
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- 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.