Abstract
The study aimed to verify the incidence of thrips in higher population densities subjected to doses of nitrogen and its possible effects on the biomass production of onion bulbs. The treatments were four plant densities (400, 600, 800 thousand plants ha-1 and 1 million plants ha-1) subjected to two doses of nitrogen (150 and 200 kg N ha-1). The higher temperatures in the initial development and the absence of rain from the end of August to the end of September lead to an early incidence of thrips above the level of economic damage. The incidence of thrips is reduced linearly with increasing plant density, not being influenced by doses of up to 200 kg N ha-1. The use of nitrogen doses above 150 kg N ha-1, even in populations of one million plants per hectare, does not increase the biomass of onion bulbs. Population densities above 600 thousand plants ha-1 reduce the fresh and dry biomass of onion bulbs.
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Claims 5
Claim · model-written summary
High initial temperatures and late-season absence of rain led to early thrips incidence above the economic threshold.
- Taxon
- cebolat0
- Treatment
- higher temperatures in the initial development and the absence of rain from the end of August to the end of Septembere0
- Outcome
- incidence of thripse0
- Direction
- above the level of economic damagee0
ThripsOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher temperatures in the initial development and the absence of rain from the end of August to the end of September lead to an early incidence of thrips above the level of economic damage.”
t0“Incidência de tripes (Thrips tabaci) em populações superadensadas de cebola submetidas a doses de nitrogênio e seu efeito na biomassa dos bulbos”
Claim · model-written summary
Thrips incidence declined linearly as onion plant density increased.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The incidence of thrips is reduced linearly with increasing plant density”
t0“Incidência de tripes (Thrips tabaci) em populações superadensadas de cebola submetidas a doses de nitrogênio e seu efeito na biomassa dos bulbos”
Claim · model-written summary
Nitrogen doses through 200 kg N ha-1 did not influence thrips incidence.
- Taxon
- cebolat0
- Treatment
- doses of up to 200 kg N ha-1e0
- Outcome
- incidence of thripse1
- Direction
- not being influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“not being influenced by doses of up to 200 kg N ha-1”
e1“The incidence of thrips is reduced linearly with increasing plant density”
t0“Incidência de tripes (Thrips tabaci) em populações superadensadas de cebola submetidas a doses de nitrogênio e seu efeito na biomassa dos bulbos”
Claim · model-written summary
Nitrogen above 150 kg N ha-1 did not increase onion bulb biomass.
- Taxon
- onion
Allium cepae0 - Treatment
- nitrogen doses above 150 kg N ha-1e0
- Outcome
- biomass of onion bulbse0
- Direction
- does not increasee0
- Qualifier
- even in populations of one million plants per hectaree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of nitrogen doses above 150 kg N ha-1, even in populations of one million plants per hectare, does not increase the biomass of onion bulbs.”
Claim · model-written summary
Densities above 600 thousand plants ha-1 reduced fresh and dry onion bulb biomass.
- Taxon
- onionAllium cepae0
- Treatment
- Population densities above 600 thousand plants ha-1e0
- Outcome
- fresh and dry biomass of onion bulbse0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Population densities above 600 thousand plants ha-1 reduce the fresh and dry biomass of onion bulbs.”
The same questions in other papers
nitrogen · growth · Allium cepa (onion)Results differ
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- positive
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See all 81 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.