Abstract
Field trials on a silt-loamy paddy soil derived from shallow-sea deposit in direct seeding rice fields were conducted in Zhejiang, China, in 1996 to compare N efficiency of controlled release fertilizers (LP fertilizers) with the conventional urea. Six treatments including CK (no N fertilizer), conventional urea and different types of LP fertilizers at different rates were designed for two succeeding crops of early and late rice. A blend of different types of LP fertilizers as a single preplant co-situs application released N in a rate and amount synchronizing with uptake pattern of direct seeding rice. A single preplant application of the LP fertilizers could meet the N requirement of rice for the whole growth period without need of topdressing. Using LP fertilizer blends, equivalent grain yields could be maintained even if the N fertilization rates were reduced by 25%～50% compared with the conventional urea. Agronomic efficiency of the LP fertilizers was 13.6%～86.4% higher than that of the conventional urea in early rice and 100%～164.1% in late rice, depending on the amounts of the LP fertilizers applied. N fertilizer recovery rate increased from 27.4% for the conventional application of urea to 41.7%～54.1% for the single preplant co-situs application of the LP fertilizers. Use of the LP fertilizers was promising if the increase in production costs due to the high LP fertilizer prices could be compensated by increase in yield and N efficiency, reduction in labor costs and improvement in environment.
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Claims 7
Claim · model-written summary
A preplant blend released nitrogen in synchrony with direct seeded rice uptake.
- Taxon
- rice
Oryza sativae0 - Treatment
- LP fertilizerse0
- Outcome
- released N in a rate and amount synchronizing with uptake patterne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A blend of different types of LP fertilizers as a single preplant co-situs application released N in a rate and amount synchronizing with uptake pattern of direct seeding rice”
Claim · model-written summary
A single preplant LP fertilizer application met rice nitrogen requirements over the whole growth period without topdressing.
- Taxon
- riceOryza sativae0
- Treatment
- LP fertilizerse0
- Outcome
- N requirement of rice for the whole growth periode0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single preplant application of the LP fertilizers could meet the N requirement of rice for the whole growth period without need of topdressing”
Claim · model-written summary
LP fertilizer blends maintained equivalent grain yield with 25%～50% less nitrogen than conventional urea.
- Taxon
- riceOryza sativat0
- Treatment
- LP fertilizer blendse0
- Outcome
- grain yieldse0
- Direction
- equivalente0
- Value
- 25%～50%e0
- Comparator
- conventional ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using LP fertilizer blends, equivalent grain yields could be maintained even if the N fertilization rates were reduced by 25%～50% compared with the conventional urea”
t0“Rice”
Claim · model-written summary
LP fertilizer agronomic efficiency in early rice was 13.6%～86.4% higher than conventional urea.
- Taxon
- riceOryza sativae0
- Organ / stage
- early ricee0
- Treatment
- LP fertilizerse0
- Outcome
- Agronomic efficiencye0
- Direction
- highere0
- Value
- 13.6%～86.4%e0
- Comparator
- conventional ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Agronomic efficiency of the LP fertilizers was 13.6%～86.4% higher than that of the conventional urea in early rice”
Claim · model-written summary
LP fertilizer agronomic efficiency in late rice was 100%～164.1% higher than conventional urea.
- Taxon
- riceOryza sativae0
- Organ / stage
- late ricee0
- Treatment
- LP fertilizerse0
- Outcome
- Agronomic efficiencye0
- Direction
- highere0
- Value
- 100%～164.1%e0
- Comparator
- conventional ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Agronomic efficiency of the LP fertilizers was 13.6%～86.4% higher than that of the conventional urea in early rice and 100%～164.1% in late rice”
Claim · model-written summary
LP fertilizer application increased nitrogen recovery from 27.4% with urea to 41.7%～54.1%.
- Taxon
- riceOryza sativat0
- Treatment
- single preplant co-situs application of the LP fertilizerse0
- Outcome
- N fertilizer recovery ratee0
- Direction
- increasede0
- Value
- 41.7%～54.1%e0
- Qualifier
- 27.4%e0
- Comparator
- conventional application of ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilizer recovery rate increased from 27.4% for the conventional application of urea to 41.7%～54.1% for the single preplant co-situs application of the LP fertilizers”
t0“Rice”
Claim · model-written summary
The authors consider LP fertilizers promising if higher costs are offset by yield, efficiency, labor, and environmental gains.
- Taxon
- riceOryza sativae0
- Outcome
- Use of the LP fertilizerse0
- Qualifier
- if the increase in production costs due to the high LP fertilizer prices could be compensated by increase in yield and N efficiency, reduction in labor costs and improvement in environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Use of the LP fertilizers was promising if the increase in production costs due to the high LP fertilizer prices could be compensated by increase in yield and N efficiency, reduction in labor costs and improvement in environment”
The same questions in other papers
fertilization · nutrient: efficiency · Oryza sativa (rice)Positive and negative results
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- no effect
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- negative
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See all 220 papers →fertilization · yield · Oryza sativa (rice)Positive and negative results
3,182 papers in the same direction as this paper · 207 in the opposite direction · 65 reporting no difference from an alternative
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See all 3,455 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.