Abstract
The influence of nitrogen, phosphorus, and potassium on the severity of anthracnose crown rot was evaluated in three greenhouse studies. Strawberry plants were fertilized three times weekly with a modified Hoagland's Nutrient Solution containing the treatments and inoculated eight weeks after treatment applications began with a conidial suspension of the causal pathogen, Colletotrichum fragariae. Disease severity was rated 30 days later on a scale of 0 (no symptoms) to 6 (plant dead). In the first study, the effect of N, P, and K levels was evaluated using 16 treatments: eight N levels with either low P and K or high P and K. Disease severity ratings and percent foliar N increased as N level increased but were not influenced by the level of P and K. In two other experiments, seven N sources were each evaluated at three levels. Plants receiving 160 ppm N had higher disease severity ratings than plants receiving 0 or 40 ppm N. Among plants receiving 160 ppm N, those treated with Ca(NO 3 ) 2 had the least disease. When N fertilizer is applied to strawberry plants as Ca(NO 3 ) 2 , anthracnose crown rot severity should be less severe than when N is applied in ammonium forms. Accepted for publication 13 April 2009. Published 9 June 2009.
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Claims 6
Claim · model-written summary
Disease severity rose with nitrogen level.
- Taxon
- Strawberry
_single2.jpg?width=60)
Fragaria ×ananassae1 - Treatment
- N levele0
- Interactor
- Colletotrichum fragariaeColletotrichum fragariaee2pathogen
- Outcome
- Disease severity ratingse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“Disease severity ratings and percent foliar N increased as N level increased”
e1“Strawberry plants were fertilized three times weekly”
e2“Colletotrichum fragariae”
Claim · model-written summary
Foliar nitrogen increased with nitrogen level.
- Taxon
- StrawberryFragaria ×ananassae1
- Treatment
- N levele0
- Outcome
- percent foliar Ne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“percent foliar N increased as N level increased”
e1“Strawberry plants were fertilized three times weekly”
Claim · model-written summary
Phosphorus and potassium levels did not influence disease severity or foliar nitrogen.
- Taxon
- StrawberryFragaria ×ananassae1
- Treatment
- level of P and Ke0
- Outcome
- Disease severity ratings and percent foliar Ne0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease severity ratings and percent foliar N increased as N level increased but were not influenced by the level of P and K”
e1“Strawberry plants were fertilized three times weekly”
Claim · model-written summary
At 160 ppm N, disease severity exceeded that at 0 or 40 ppm N.
- Taxon
- StrawberryFragaria ×ananassae1
- Treatment
- 160 ppm Ne0
- Outcome
- disease severity ratingse0
- Direction
- highere0
- Comparator
- 0 or 40 ppm Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants receiving 160 ppm N had higher disease severity ratings than plants receiving 0 or 40 ppm N”
e1“Strawberry plants were fertilized three times weekly”
Claim · model-written summary
At 160 ppm N, calcium nitrate produced the least disease.
- Taxon
- StrawberryFragaria ×ananassae1
- Treatment
- Ca(NO 3 ) 2e0
- Outcome
- diseasee0
- Direction
- leaste0
- Comparator
- plants receiving 160 ppm Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among plants receiving 160 ppm N, those treated with Ca(NO 3 ) 2 had the least disease”
e1“Strawberry plants were fertilized three times weekly”
Claim · model-written summary
The authors recommend calcium nitrate instead of ammonium forms to reduce anthracnose crown rot severity.
- Taxon
- strawberryFragaria ×ananassae0
- Treatment
- Ca(NO 3 ) 2e0
- Outcome
- anthracnose crown rot severitye0
- Direction
- less severee0
- Comparator
- ammonium formse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When N fertilizer is applied to strawberry plants as Ca(NO 3 ) 2 , anthracnose crown rot severity should be less severe than when N is applied in ammonium forms”
The same questions in other papers
calcium atom · disease · Fragaria x ananassa (strawberry)Positive and negative results
8 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
6 papers more in this group
See all 10 papers →nitrogen · disease · Fragaria x ananassa (strawberry)Positive and negative results
1 in the opposite direction
- positive
potassium · disease · Fragaria x ananassa (strawberry)Positive and negative results
1 paper in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →phosphorus · disease · Fragaria x ananassa (strawberry)Results agree
2 papers in the same direction as this paper
- no effect
- no effect
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.