Abstract
Slow‐release N materials are used to reduce N leaching losses from sandy soils and extend N availability over a growing season. The objective of this research was to examine the effectiveness of preplant sulfur‐coated urea (SCU) and polyolefin resin‐coated urea (PCU) N fertilizers compared to split applications of soluble fertilizer on green bell pepper ( Capsicum annuum L.) yield and quality. The 3‐yr experiment consisted of green bell peppers grown on 15‐cm raised beds utilizing plastic mulch and drip irrigation. Treatments were N source (preplant SCU, preplant PCU, and fertigated ammonium nitrate) and N rate (90, 135, 180, or 225 kg N ha −1 ). Ammonium nitrate (AN) was applied as a split application, with 20% preplant and 80% applied every‐other week in five equal applications. Other N sources were applied 100% preplant. A zero N control was also included. Collected data included plant height, leaf N content, and fruit yield and quality. In two of three years pepper yield was maximized at or near the Alabama recommended rate of 135 kg N ha −1 . Nitrogen source rarely affected the partitioning of harvested peppers into grade groups. Adding N from any N source decreased percent nonmarketable yield (cull) and increased the percentage of marketable yield that was large (U.S. 1) peppers. There were few consistent differences in pepper yield or quality due to N source. Given cost considerations of drip application and N sources, slow‐release N materials may be a viable option for small‐scale growers not using drip application systems.
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Claims 6
Claim · model-written summary
Pepper yield peaked near 135 kg N ha −1 in two of three years.
- Taxon
- bell peppert0
- Treatment
- 135 kg N ha −1e0
- Outcome
- pepper yielde0
- Direction
- maximizede0
- Qualifier
- In two of three yearse0
Not reportedComparator
Verbatim
e0“In two of three years pepper yield was maximized at or near the Alabama recommended rate of 135 kg N ha −1 .”
t0“Bell Pepper”
Claim · model-written summary
Nitrogen source rarely affected the distribution of harvested peppers among grades.
- Taxon
- bell peppert0
- Treatment
- Nitrogen sourcee0
- Outcome
- partitioning of harvested peppers into grade groupse0
Not reportedComparatorDirection
Verbatim
e0“Nitrogen source rarely affected the partitioning of harvested peppers into grade groups.”
t0“Bell Pepper”
Claim · model-written summary
Nitrogen from any source reduced the percentage of nonmarketable yield.
- Taxon
- bell peppert0
- Treatment
- Adding N from any N sourcee0
- Outcome
- percent nonmarketable yield (cull)e0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“Adding N from any N source decreased percent nonmarketable yield (cull)”
t0“Bell Pepper”
Claim · model-written summary
Nitrogen from any source increased the share of marketable yield in large peppers.
- Taxon
- bell peppert0
- Treatment
- Adding N from any N sourcee0
- Outcome
- percentage of marketable yield that was large (U.S. 1) pepperse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Adding N from any N source decreased percent nonmarketable yield (cull) and increased the percentage of marketable yield that was large (U.S. 1) peppers.”
t0“Bell Pepper”
Claim · model-written summary
Pepper yield and quality showed few consistent differences among nitrogen sources.
- Taxon
- bell peppert0
- Treatment
- N sourcee0
- Outcome
- pepper yield or qualitye0
- Direction
- few consistent differencese0
Not reportedComparator
Verbatim
e0“There were few consistent differences in pepper yield or quality due to N source.”
t0“Bell Pepper”
Claim · model-written summary
The authors consider slow-release nitrogen viable for small growers without drip systems.
Verbatim
e0“slow‐release N materials may be a viable option for small‐scale growers not using drip application systems.”
t0“Bell Pepper”
The same questions in other papers
nitrogen · yield · Capsicum annuum (sweet pepper)Results differ
37 papers in the same direction as this paper · 7 in the opposite direction
- positive
- negative
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See all 45 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.