Abstract
Effect of Nitration of Organic Materials on Nitrogen Availability and Yield of Tomato in Soilless Culture In the cultivation of horticultural plants in greenhouses the most commonly used substrate is rockwool, while organic substrates are used in an unprocessed state. Cultivation in organic substrates, after they have been suitably processed, also makes it possible to obtain high yields at levels similar to those in rockwool cultures. Fibrous organic substrates, due to the wide C:N ratio, are characterized by high biological sorption towards nitrogen, causing N deficiency during the initial period of plant growth. In 2007-2009, a study was conducted, the aim of which was to determine the effect of nitration of fibrous organic substrates (sawdust, rye straw, flax shives) with nitric acid on nitrogen availability and the yields produced by tomato plants. The process of nitration of the organic substrates was carried out with the use of 10% HNO 3 . The appropriate pH of the substrates after the process of nitration was obtained by washing the substrates with water. As a result of nitration the levels of nitrogen fixed in lignin compounds and simpler polysaccharides increased to about 2%. Nitration of the organic substrates increased nitrogen availability to plants in the first five weeks of culture. Subsequently, the N-NO 3 content in the nutrient solution collected from the nitrated substrates was at the same level as for the nonnitrated substrates. The yields produced by tomato plants depended on both the nature of the substrate and whether or not it had been nitrated with nitric acid. The most useful organic substrate for soilless culture, retaining good structure during the growing period, was the substrate of sawdust. The substrate of straw was found to undergo quick biodegradation, therefore its usefulness for soilless culture was low. The highest yield of tomato was obtained from the cultures on rockwool and on the nitrated sawdust substrate; the lowest yield was produced on the straw substrate.
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Claims 9
Claim · model-written summary
Nitration increased nitrogen fixed in substrate lignin and polysaccharides to about 2%.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- nitratione0
- Outcome
- levels of nitrogen fixed in lignin compounds and simpler polysaccharidese0
- Direction
- increasede0
- Value
- about 2%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As a result of nitration the levels of nitrogen fixed in lignin compounds and simpler polysaccharides increased to about 2%.”
t0“Tomato”
Claim · model-written summary
Nitration increased plant nitrogen availability during the first five weeks.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- Nitration of the organic substratese0
- Outcome
- nitrogen availability to plantse0
- Direction
- increasede0
- Qualifier
- in the first five weeks of culturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitration of the organic substrates increased nitrogen availability to plants in the first five weeks of culture.”
t0“Tomato”
Claim · model-written summary
Later, nitrate in nutrient solution from nitrated substrates equalled that from nonnitrated substrates.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- nitrated substratese0
- Outcome
- N-NO 3 content in the nutrient solutione0
- Direction
- at the same levele0
- Comparator
- nonnitrated substratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Subsequently, the N-NO 3 content in the nutrient solution collected from the nitrated substrates was at the same level as for the nonnitrated substrates.”
t0“Tomato”
Claim · model-written summary
Tomato yields depended on substrate type and nitration status.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- nature of the substratee0
- Outcome
- yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yields produced by tomato plants depended on both the nature of the substrate and whether or not it had been nitrated with nitric acid.”
Claim · model-written summary
Sawdust retained good structure and was the most useful organic substrate.
- Taxon
- TomatoSolanum lycopersicumt0
- Material
- sawduste0
- Outcome
- retaining good structure during the growing periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most useful organic substrate for soilless culture, retaining good structure during the growing period, was the substrate of sawdust.”
t0“Tomato”
Claim · model-written summary
Straw substrate biodegraded quickly and had low suitability for soilless culture.
- Taxon
- TomatoSolanum lycopersicumt0
- Material
- strawe0
- Outcome
- quick biodegradatione0
- Qualifier
- usefulness for soilless culture was lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The substrate of straw was found to undergo quick biodegradation, therefore its usefulness for soilless culture was low.”
t0“Tomato”
Claim · model-written summary
Rockwool produced the highest tomato yield.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- rockwoole0
- Outcome
- yield of tomatoe0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield of tomato was obtained from the cultures on rockwool and on the nitrated sawdust substrate; the lowest yield was produced on the straw substrate.”
Claim · model-written summary
Nitrated sawdust produced the highest tomato yield.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- nitrated sawdust substratee0
- Outcome
- yield of tomatoe0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield of tomato was obtained from the cultures on rockwool and on the nitrated sawdust substrate; the lowest yield was produced on the straw substrate.”
Claim · model-written summary
Straw substrate produced the lowest tomato yield.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- straw substratee0
- Outcome
- yielde0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest yield of tomato was obtained from the cultures on rockwool and on the nitrated sawdust substrate; the lowest yield was produced on the straw substrate.”
The same questions in other papers
growing medium · nutrient: content · Solanum lycopersicum (tomato)Positive and negative results
6 papers in the same direction as this paper · 34 in the opposite direction
- no effect
- positive
- positive
37 papers more in this group
See all 41 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.