Abstract
Lettuce as an important vegetable crop warrants special research and attention. Because of environmental and economic concerns, it is necessary to determine the most efficient application levels of irrigation water and nitrogen fertilizer to achieve the optimum yield in this crop. Two field experiments were conducted to test the effect of deficit irrigation and nitrogen fertilizer applications on agronomic growth characteristics of lettuce. Experimental treatments were arranged in split strip plots based on a completely randomized block design with three replications. The irrigation and nitrogen treatments were considered at four levels (0, 25, 50, and 100% of the currently recommended water and N fertilizer for lettuce production). Results showed that 50% of irrigation water and 25% of nitrogen (IR50N25) treatment currently recommended for lettuce production led to significantly higher water (4.4 Kg DM/m3) and N (45 kg DM/kg N) use efficiencies for the fall experiment in 2017. The same results for water of 3.9 kg DM/m3 and N of 73.1 kg DM/kg were achieved in the spring experiment 2018. The optimum lettuce biomass yield was obtained for IR50N25 treatment in both experiments.
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 5
Claim · model-written summary
IR50N25 gave significantly higher fall 2017 water use efficiency of 4.4 Kg DM/m3.
- Taxon
- Lettuce
Lactuca sativat0 - Treatment
- 50% of irrigation water and 25% of nitrogen (IR50N25)e0
- Outcome
- watere0
- Direction
- highere0
- Value
- 4.4 Kg DM/m3e0
- Setting
- fall experiment in 2017e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“50% of irrigation water and 25% of nitrogen (IR50N25) treatment currently recommended for lettuce production led to significantly higher water (4.4 Kg DM/m3) and N (45 kg DM/kg N) use efficiencies for the fall experiment in 2017.”
t0“Lettuce”
Claim · model-written summary
IR50N25 gave significantly higher fall 2017 nitrogen use efficiency of 45 kg DM/kg N.
- Taxon
- LettuceLactuca sativat0
- Treatment
- 50% of irrigation water and 25% of nitrogen (IR50N25)e0
- Outcome
- Ne0
- Direction
- highere0
- Value
- 45 kg DM/kg Ne0
- Setting
- fall experiment in 2017e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“50% of irrigation water and 25% of nitrogen (IR50N25) treatment currently recommended for lettuce production led to significantly higher water (4.4 Kg DM/m3) and N (45 kg DM/kg N) use efficiencies for the fall experiment in 2017.”
t0“Lettuce”
Claim · model-written summary
Spring 2018 water use efficiency under the same treatment was 3.9 kg DM/m3.
- Taxon
- LettuceLactuca sativat0
- Outcome
- watere0
- Value
- 3.9 kg DM/m3e0
- Setting
- spring experiment 2018e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The same results for water of 3.9 kg DM/m3 and N of 73.1 kg DM/kg were achieved in the spring experiment 2018.”
t0“Lettuce”
Claim · model-written summary
Spring 2018 nitrogen use efficiency under the same treatment was 73.1 kg DM/kg.
- Taxon
- LettuceLactuca sativat0
- Outcome
- Ne0
- Value
- 73.1 kg DM/kge0
- Setting
- spring experiment 2018e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The same results for water of 3.9 kg DM/m3 and N of 73.1 kg DM/kg were achieved in the spring experiment 2018.”
t0“Lettuce”
Claim · model-written summary
IR50N25 yielded optimum lettuce biomass in both experiments.
- Taxon
- lettuceLactuca sativae0
- Treatment
- IR50N25e0
- Outcome
- lettuce biomass yielde0
- Direction
- optimume0
- Qualifier
- both experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum lettuce biomass yield was obtained for IR50N25 treatment in both experiments.”
The same questions in other papers
irrigation · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
4 papers more in this group
See all 8 papers →nitrogen · nutrient: content · Lactuca sativa (garden lettuce)Positive and negative results
34 papers in the same direction as this paper · 17 in the opposite direction
- negative
- negative
- negative
48 papers more in this group
See all 52 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.