Abstract
Abstract In order to evaluate the availability of fertilizer N applied by drip irrigation, tomatoes ( Lycopersicum esculentum Mill.) were grown in the field for two years on Panoche clay loam (Typic Torriorthents). Labeled fertilizer was banded in the soil and furrow or drip irrigated as well as applied through the drip system to measure the effect of different placements and timing on fertilizer N availability. Some treatments received N only at planting while others received split applications through the drip system at different stages of plant development. Nitrogen ( 15 N depleted) was applied to the center harvest rows while commercial (0.36% 15 N) ammonium sulfate was applied to the outside rows of each plot. Plants from the center harvest rows were analyzed for total N and isotopic composition. Plant analyses indicated that treatments in which fertilizer N was applied through the drip system, regardless of timing or growth stage, showed higher percent fertilizer N contents during most of the growing season than those of the furrow‐irrigated treatments. The greatest amount of fertilizer N in the plant at any sampling time was 40 to 50% of the total plant N. Only small differences in total tomato yields were observed among treatments, although drip‐applied did appear to enhance tomato fruit maturity. For high efficiency, fertilizer N should be placed carefully with respect to plant roots, taking into consideration the direction of water movement during irrigations.
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Claims 5
Claim · model-written summary
Drip applied fertilizer nitrogen increased plant fertilizer nitrogen percentages during most of the season compared with furrow irrigation.
- Taxon
- tomatoes
Solanum lycopersicume0 - Treatment
- fertilizer N was applied through the drip systeme1
- Outcome
- percent fertilizer N contentse1
- Direction
- highere1
- Qualifier
- regardless of timing or growth stagee1
- Comparator
- furrow‐irrigated treatmentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomatoes ( Lycopersicum esculentum Mill.)”
e1“treatments in which fertilizer N was applied through the drip system, regardless of timing or growth stage, showed higher percent fertilizer N contents during most of the growing season than those of the furrow‐irrigated treatments.”
Claim · model-written summary
The maximum fertilizer nitrogen fraction at a sampling time was 40 to 50% of total plant nitrogen.
- Taxon
- tomatoesSolanum lycopersicume0
- Outcome
- fertilizer N in the plante1
- Direction
- greateste1
- Value
- 40 to 50%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tomatoes ( Lycopersicum esculentum Mill.)”
e1“The greatest amount of fertilizer N in the plant at any sampling time was 40 to 50% of the total plant N.”
Claim · model-written summary
Total tomato yields differed only slightly among treatments.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- treatmentse0
- Outcome
- total tomato yieldse0
- Direction
- small differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only small differences in total tomato yields were observed among treatments”
Claim · model-written summary
Drip applied fertilizer appeared to enhance tomato fruit maturity.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- drip‐appliede0
- Outcome
- tomato fruit maturitye0
- Direction
- enhancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drip‐applied did appear to enhance tomato fruit maturity”
Claim · model-written summary
The authors recommend careful fertilizer nitrogen placement relative to roots and irrigation water movement.
- Taxon
- tomatoesSolanum lycopersicume1
- Outcome
- fertilizer N should be placed carefully with respect to plant rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For high efficiency, fertilizer N should be placed carefully with respect to plant roots, taking into consideration the direction of water movement during irrigations.”
e1“tomatoes ( Lycopersicum esculentum Mill.)”
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