Abstract
Abstract Application of plant nutrients with drip irrigation systems is desirable for labor and energy savings and flexibility in timing nutrient applications. Evaluations of P movement in the soil and uptake by tomatoes ( Lycopersicum esculentum ) were made when orthophosphate and glycerophosphate were applied through a drip irrigation system and in comparison with 26 kg of P/ha banded below the seed at planting. A significantly higher P content was measured in seedling leaves when 26 kg of P/ha was applied by drip irrigation than when the same rate was banded. No differences in P content of whole tops of seedlings were measured at equal rates of inorganic or organic P applied through the drip system. There was a significant linear response of P uptake to P rate. With drip irrigation, orthophosphate moved a much greater distance into the soil than had been previously observed for comparable application rates per hectare. Glycerophosphate moved 5 to 10 cm farther through the soil at application rates of 6.5 and 13 kg of P/ha than did orthophosphate. At the relatively high rate of 39 kg of P/ha, orthophosphate moved 25 cm horizontally and 30 cm vertically in the soil profile. Movement of orthophosphate resulted from saturation of the soil reaction sites near the point of application with phosphorus and subsequent mass flow with the soil water. The distance of P movement was proportional to the application rate. Glycerophosphate must undergo enzymatic hydrolysis before releasing orthophosphate ions into the soil solution where orthophosphate can be removed from solution by soil reactions. Consequently, glycerophosphate moved farther than orthophosphate at low application rates.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Drip application of 26 kg P/ha gave higher seedling leaf P content than banding the same rate.
- Taxon
- tomatoes
Solanum lycopersicumt0 - Organ / stage
- seedling leavese0
- Treatment
- 26 kg of P/ha was applied by drip irrigatione0
- Outcome
- P contente0
- Direction
- highere0
- Comparator
- the same rate was bandede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significantly higher P content was measured in seedling leaves when 26 kg of P/ha was applied by drip irrigation than when the same rate was banded.”
t0“tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
Inorganic and organic P delivered by drip produced no measured difference in seedling top P content at equal rates.
- Taxon
- tomatoesSolanum lycopersicume1
- Organ / stage
- whole tops of seedlingse0
- Treatment
- inorganic or organic P applied through the drip systeme0
- Outcome
- P contente0
- Direction
- No differencese0
- Comparator
- equal ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences in P content of whole tops of seedlings were measured at equal rates of inorganic or organic P applied through the drip system.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
P uptake increased linearly with P rate.
- Taxon
- tomatoesSolanum lycopersicume1
- Treatment
- P ratee0
- Outcome
- P uptakee0
- Direction
- linear responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant linear response of P uptake to P rate.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
Drip applied orthophosphate moved farther through soil than previously observed at comparable application rates.
- Taxon
- tomatoesSolanum lycopersicume1
- Treatment
- drip irrigatione0
- Outcome
- orthophosphate moved a much greater distance into the soile0
- Direction
- greatere0
- Comparator
- previously observed for comparable application rates per hectaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With drip irrigation, orthophosphate moved a much greater distance into the soil than had been previously observed for comparable application rates per hectare.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
At 6.5 and 13 kg P/ha, glycerophosphate moved 5 to 10 cm farther through soil than orthophosphate.
- Taxon
- tomatoesSolanum lycopersicume1
- Treatment
- Glycerophosphatee0
- Outcome
- moved 5 to 10 cm farther through the soile0
- Direction
- farthere0
- Value
- 5 to 10 cme0
- Qualifier
- application rates of 6.5 and 13 kg of P/hae0
- Comparator
- orthophosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycerophosphate moved 5 to 10 cm farther through the soil at application rates of 6.5 and 13 kg of P/ha than did orthophosphate.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
At 39 kg P/ha, orthophosphate moved 25 cm horizontally through soil.
- Taxon
- tomatoesSolanum lycopersicume1
- Treatment
- 39 kg of P/hae0
- Outcome
- orthophosphate moved 25 cm horizontallye0
- Value
- 25 cme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the relatively high rate of 39 kg of P/ha, orthophosphate moved 25 cm horizontally and 30 cm vertically in the soil profile.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
At 39 kg P/ha, orthophosphate moved 30 cm vertically through soil.
- Taxon
- tomatoesSolanum lycopersicume1
- Treatment
- 39 kg of P/hae0
- Outcome
- 30 cm vertically in the soil profilee0
- Value
- 30 cme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the relatively high rate of 39 kg of P/ha, orthophosphate moved 25 cm horizontally and 30 cm vertically in the soil profile.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
Orthophosphate movement distance was proportional to application rate.
- Taxon
- tomatoesSolanum lycopersicume1
- Treatment
- application ratee0
- Outcome
- distance of P movemente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The distance of P movement was proportional to the application rate.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
Saturation of nearby soil reaction sites and subsequent mass flow explained orthophosphate movement.
- Taxon
- tomatoesSolanum lycopersicume1
- Outcome
- Movement of orthophosphatee0
- Qualifier
- saturation of the soil reaction sites near the point of application with phosphorus and subsequent mass flow with the soil watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Movement of orthophosphate resulted from saturation of the soil reaction sites near the point of application with phosphorus and subsequent mass flow with the soil water.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
Claim · model-written summary
The authors attributed greater low rate glycerophosphate movement to its need for enzymatic hydrolysis before soil reactions remove released orthophosphate.
- Taxon
- tomatoesSolanum lycopersicume1
- Outcome
- glycerophosphate moved farther than orthophosphatee0
- Qualifier
- enzymatic hydrolysise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycerophosphate must undergo enzymatic hydrolysis before releasing orthophosphate ions into the soil solution where orthophosphate can be removed from solution by soil reactions. Consequently, glycerophosphate moved farther than orthophosphate at low application rates.”
e1“uptake by tomatoes ( Lycopersicum esculentum )”
The same questions in other papers
irrigation · nutrient: content · Solanum lycopersicum (tomato)Positive and negative results
28 papers in the same direction as this paper · 15 in the opposite direction
- negative
- no effect
- no effect
40 papers more in this group
See all 44 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.