Abstract
This paper presents research on lettuce production's physiological and economic aspects under deficit water and nitrogen conditions. Lettuce (Lactuca sativa L. var. longifolia) is an essential crop for the economy of California. Two experiments were conducted during fall 2017 and spring 2018 to evaluate the effect of different water applications (0, 25, 50, and 100% of required water to replenish weekly crop evapotranspiration). Nitrogen fertilizer levels (0, 25, 50, and 100 percent of nitrogen required for optimum plant growth based on soil chemical analysis) on lettuce optimize the best water and nitrogen level to achieve the highest input efficiency economically justifiable yield. Soil moisture followed a decreasing trend as the irrigation level decreased, while there was no identical trend in soil moisture content in response to nitrogen treatments. The highest leaf water potential was measured for 100% nitrogen application (N100), whereas the lowest one was recorded in the plants with zero nitrogen (N0). The higher irrigation levels caused lower leaf water potential in lettuce, while the zero irrigation level (IR0) demonstrated the highest leaf water potential. Across all treatments, leaf chlorophyll content was more significantly affected by irrigation levels compared to nitrogen treatments. The higher irrigation and nitrogen levels up to 100% produced the highest lettuce yield. However, the highest water and nitrogen use efficiency was recorded at IR50N25 treatment in both growing seasons. The same treatment produced an economically justifiable yield.
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Claims 11
Claim · model-written summary
Soil moisture declined with lower irrigation.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- irrigation levele0
- Outcome
- Soil moisturee0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil moisture followed a decreasing trend as the irrigation level decreased”
t0“Lettuce Production”
Claim · model-written summary
Soil moisture showed no consistent trend with nitrogen treatments.
- Taxon
- lettuceLactuca sativat0
- Treatment
- nitrogen treatmentse0
- Outcome
- soil moisture contente0
- Direction
- no identical trende0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no identical trend in soil moisture content in response to nitrogen treatments”
t0“Lettuce Production”
Claim · model-written summary
Leaf water potential was highest with 100% nitrogen.
- Taxon
- lettuceLactuca sativat0
- Treatment
- 100% nitrogen applicatione0
- Outcome
- leaf water potentiale0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest leaf water potential was measured for 100% nitrogen application (N100)”
t0“Lettuce Production”
Claim · model-written summary
Leaf water potential was lowest with zero nitrogen.
- Taxon
- lettuceLactuca sativat0
- Treatment
- zero nitrogene0
- Outcome
- the lowest onee0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lowest one was recorded in the plants with zero nitrogen (N0)”
t0“Lettuce Production”
Claim · model-written summary
Higher irrigation lowered leaf water potential.
- Taxon
- lettuceLactuca sativat0
- Treatment
- higher irrigation levelse0
- Outcome
- leaf water potentiale0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher irrigation levels caused lower leaf water potential in lettuce”
t0“Lettuce Production”
Claim · model-written summary
Zero irrigation produced the highest leaf water potential.
- Taxon
- lettuceLactuca sativat0
- Treatment
- zero irrigation levele0
- Outcome
- leaf water potentiale0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the zero irrigation level (IR0) demonstrated the highest leaf water potential”
t0“Lettuce Production”
Claim · model-written summary
Irrigation affected chlorophyll content more significantly than nitrogen.
- Taxon
- lettuceLactuca sativat0
- Treatment
- irrigation levelse0
- Outcome
- leaf chlorophyll contente0
- Comparator
- nitrogen treatmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf chlorophyll content was more significantly affected by irrigation levels compared to nitrogen treatments”
t0“Lettuce Production”
Claim · model-written summary
Higher irrigation and nitrogen levels up to 100% produced the highest yield.
- Taxon
- lettuceLactuca sativat0
- Treatment
- higher irrigation and nitrogen levels up to 100%e0
- Outcome
- lettuce yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher irrigation and nitrogen levels up to 100% produced the highest lettuce yield”
t0“Lettuce Production”
Claim · model-written summary
IR50N25 had the highest water use efficiency in both seasons.
- Taxon
- lettuceLactuca sativat0
- Treatment
- IR50N25 treatmente0
- Outcome
- water and nitrogen use efficiencye0
- Direction
- higheste0
- Qualifier
- both growing seasonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest water and nitrogen use efficiency was recorded at IR50N25 treatment in both growing seasons”
t0“Lettuce Production”
Claim · model-written summary
IR50N25 had the highest nitrogen use efficiency in both seasons.
- Taxon
- lettuceLactuca sativat0
- Treatment
- IR50N25 treatmente0
- Outcome
- water and nitrogen use efficiencye0
- Direction
- higheste0
- Qualifier
- both growing seasonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest water and nitrogen use efficiency was recorded at IR50N25 treatment in both growing seasons”
t0“Lettuce Production”
Claim · model-written summary
IR50N25 produced an economically justifiable yield.
- Taxon
- lettuceLactuca sativat0
- Outcome
- economically justifiable yielde0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The same treatment produced an economically justifiable yield”
t0“Lettuce Production”
The same questions in other papers
irrigation · yield · Lactuca sativa (garden lettuce)Positive and negative results
31 papers in the same direction as this paper · 23 in the opposite direction · 2 reporting no difference from an alternative
- positive
- negative
- negative
53 papers more in this group
See all 57 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
- positive
- no effect
- negative
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.