Abstract
Commercial lettuce production requires adequate levels of nitrogen (N), phosphorus (P), and potassium (K) to provide high-quality postharvest attributes needed for longer shelf life. Factorial experiments were conducted in Salinas, CA, to evaluate yield and postharvest quality of both romaine and iceberg lettuce using fertilizers containing various levels of N, P, and K. Lettuce was evaluated for yield and postharvest quality parameters, including color, wilt, turgidity, glossiness, decay, brittleness, fringe burn, and salt burn. Uptake of N, P, K, calcium, and silicon by plants was also determined. Regardless of fertilizer treatment, shelf life and visual quality were better in the iceberg lettuce than romaine lettuce when cold-stored at 1 °C for 14 d. Yield increased with increased N application rate, but post-harvest quality fell at high levels of N (337 kg·ha −1 ) and P (225 kg·ha −1 ). The most economical treatment providing the highest yield and best post-harvest quality was the combination of 225 kg·ha −1 N and 112 kg·ha −1 P.
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Claims 5
Claim · model-written summary
Iceberg lettuce had better shelf life and visual quality than romaine after 14 days at 1 °C.
- Taxon
- lettuce
Lactuca sativae0 - Material
- iceberg lettucee0
- Treatment
- cold-stored at 1 °C for 14 de0
- Outcome
- shelf life and visual qualitye0
- Direction
- bettere0
- Comparator
- romaine lettucee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of fertilizer treatment, shelf life and visual quality were better in the iceberg lettuce than romaine lettuce when cold-stored at 1 °C for 14 d.”
Claim · model-written summary
Lettuce yield rose as nitrogen application rate rose.
- Taxon
- LettuceLactuca sativat0
- Treatment
- increased N application ratee0
- Outcome
- Yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield increased with increased N application rate”
t0“Yield and Postharvest Quality of Lettuce”
Claim · model-written summary
High nitrogen reduced lettuce postharvest quality.
- Taxon
- LettuceLactuca sativat0
- Treatment
- N (337 kg·ha −1 )e0
- Outcome
- post-harvest qualitye0
- Direction
- felle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-harvest quality fell at high levels of N (337 kg·ha −1 ) and P (225 kg·ha −1 )”
t0“Yield and Postharvest Quality of Lettuce”
Claim · model-written summary
High phosphorus reduced lettuce postharvest quality.
- Taxon
- LettuceLactuca sativat0
- Treatment
- P (225 kg·ha −1 )e0
- Outcome
- post-harvest qualitye0
- Direction
- felle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-harvest quality fell at high levels of N (337 kg·ha −1 ) and P (225 kg·ha −1 )”
t0“Yield and Postharvest Quality of Lettuce”
Claim · model-written summary
The combination of 225 kg·ha −1 N and 112 kg·ha −1 P was most economical and gave the highest yield and best postharvest quality.
- Taxon
- LettuceLactuca sativat0
- Treatment
- combination of 225 kg·ha −1 N and 112 kg·ha −1 Pe0
- Outcome
- most economical treatment providing the highest yield and best post-harvest qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most economical treatment providing the highest yield and best post-harvest quality was the combination of 225 kg·ha −1 N and 112 kg·ha −1 P.”
t0“Yield and Postharvest Quality of Lettuce”
The same questions in other papers
nitrogen · yield · Lactuca sativa (garden lettuce)Positive and negative results
60 papers in the same direction as this paper · 17 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- positive
- no effect
75 papers more in this group
See all 79 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.