Abstract
Nickel is a micronutrient involved in nitrogen metabolism and a constituent of the urease molecule. Plant growth and urease activity were evaluated in lettuce (Lactuca sativa L.) grown in soil-filled pots in a 2 x 8 factorial design with two nitrogen (N) sources and eight Ni rates, with five replications. Nitrogen was applied at 200 mg dm-3 (half the dose incorporated into the soil at seedling transplanting and half top-dressed later) using the sources NH4NO3 (AN) and CO(NH2)2 (Ur). The Ni treatments (0, 2, 4, 8, 12, 16, 24 and 32 mg dm-3) were applied as NiCl2. The shoot dry-matter yield, leaf urease activity, Ni levels in the lettuce leaves and Ni levels extracted from soil with Mehlich-3 (M-3) and DTPA were determined. In the plants supplied with AN, the shoot dry-matter yield was higher than in those supplied with Ur. There was no difference in shoot dry matter in response to soil-applied Ni. The leaf urease activity increased with Ni application, regardless of the N source. The extractions with M-3 and DTPA were efficient to evaluate Ni availability for lettuce in the Red-Yellow Latosol.
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Claims 4
Claim · model-written summary
Lettuce supplied with NH4NO3 (AN) had higher shoot dry-matter yield than lettuce supplied with CO(NH2)2 (Ur).
- Taxon
- lettuce
Lactuca sativae1 - Treatment
- supplied with ANe2
- Outcome
- shoot dry-matter yielde2
- Direction
- highere2
- Comparator
- supplied with Ure2
- Setting
- soil-filled potse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth and urease activity were evaluated in lettuce (Lactuca sativa L.) grown in soil-filled pots”
e2“In the plants supplied with AN, the shoot dry-matter yield was higher than in those supplied with Ur”
Claim · model-written summary
Soil-applied Ni did not change lettuce shoot dry matter.
- Taxon
- lettuceLactuca sativae1
- Treatment
- soil-applied Nie3
- Outcome
- shoot dry mattere3
- Direction
- no differencee3
- Setting
- soil-filled potse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth and urease activity were evaluated in lettuce (Lactuca sativa L.) grown in soil-filled pots”
e3“There was no difference in shoot dry matter in response to soil-applied Ni”
Claim · model-written summary
Ni application increased leaf urease activity in lettuce, regardless of the N source.
- Taxon
- lettuceLactuca sativae1
- Organ / stage
- leafe4
- Treatment
- Ni applicatione4
- Outcome
- leaf urease activitye4
- Direction
- increasede4
- Qualifier
- regardless of the N sourcee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Plant growth and urease activity were evaluated in lettuce (Lactuca sativa L.) grown in soil-filled pots”
e4“The leaf urease activity increased with Ni application, regardless of the N source”
Claim · model-written summary
Mehlich-3 and DTPA extractions were efficient for evaluating Ni availability for lettuce in Red-Yellow Latosol.
- Taxon
- lettuceLactuca sativae5
- Outcome
- evaluate Ni availabilitye5
- Comparator
- M-3 and DTPAe5
- Setting
- Red-Yellow Latosole5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The extractions with M-3 and DTPA were efficient to evaluate Ni availability for lettuce in the Red-Yellow Latosol”
The same questions in other papers
nickel atom · growth · Lactuca sativa (garden lettuce)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
2 papers more in this group
See all 6 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.