Abstract
Rice (Oryza sativa L.) is one of the essential foods of the human diet; advances in agronomic crop management can improve productivity and profitability as well as reduce adverse environmental impacts. Nitrogen rates in Chile are generally based on crop yield without considering other agronomic factors. The objective of this experiment was to determine the effect of increasing N rates on plant nutrient composition and N apparent recovery in rice cultivated in five different locations in Chile. The five sites located in central Chile belong to one of the following soil orders: Inceptisol, Alfisol, and Vertisol; they were cropped in field conditions with 'Zafiro-INIA' rice fertilized with 0, 80, and 160 kg N ha -1 . Whole-plant total DM, macronutrient composition, and N apparent recovery efficiency (NARE) were determined at grain harvest. Results indicate that all evaluated parameters, with the exception of K concentration, were affected by the soil used. Nitrogen rates only affected total DM production and P, K, and Mg concentrations in plants. Phosphorus and K response decreased when N was added to some soils, which is associated with its chemical properties. Magnesium concentration exhibited an erratic effect, but it was not affected by the N rate in most soils. Nitrogen apparent recovery efficiency was not affected by the N rate and accounted for approximately 49% and 41% for 80 and 160 kg N ha -1 , respectively. Macronutrient composition was 5.1-7.7 g N, 1.3-1.8 g P, 5.4-10.8 g K, 1.68-2.57 g Ca, and 0.81-1.45 g Mg kg -1 of total DM.
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Claims 11
Claim · model-written summary
Soil affected all evaluated parameters except potassium concentration.
- Taxon
- rice
Oryza sativat0 - Outcome
- all evaluated parameterse0
- Setting
- soil usede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all evaluated parameters, with the exception of K concentration, were affected by the soil used”
t0“rice”
Claim · model-written summary
Nitrogen rates affected total dry matter production.
- Taxon
- riceOryza sativat0
- Treatment
- Nitrogen ratese0
- Outcome
- total DM productione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rates only affected total DM production and P, K, and Mg concentrations in plants”
t0“rice”
Claim · model-written summary
Nitrogen rates affected phosphorus concentration.
- Taxon
- riceOryza sativat0
- Treatment
- Nitrogen ratese0
- Outcome
- Pe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rates only affected total DM production and P, K, and Mg concentrations in plants”
t0“rice”
Claim · model-written summary
Nitrogen rates affected potassium concentration.
- Taxon
- riceOryza sativat0
- Treatment
- Nitrogen ratese0
- Outcome
- Ke0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rates only affected total DM production and P, K, and Mg concentrations in plants”
t0“rice”
Claim · model-written summary
Nitrogen rates affected magnesium concentration.
- Taxon
- riceOryza sativat0
- Treatment
- Nitrogen ratese0
- Outcome
- Mg concentrationse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen rates only affected total DM production and P, K, and Mg concentrations in plants”
t0“rice”
Claim · model-written summary
Phosphorus response decreased with nitrogen addition in some soils.
- Taxon
- riceOryza sativat0
- Treatment
- N was addede0
- Outcome
- Phosphoruse0
- Direction
- decreasede0
- Qualifier
- some soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus and K response decreased when N was added to some soils”
t0“rice”
Claim · model-written summary
Potassium response decreased with nitrogen addition in some soils.
- Taxon
- riceOryza sativat0
- Treatment
- N was addede0
- Outcome
- K responsee0
- Direction
- decreasede0
- Qualifier
- some soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus and K response decreased when N was added to some soils”
t0“rice”
Claim · model-written summary
Magnesium concentration showed erratic effects and was unaffected by nitrogen rate in most soils.
- Taxon
- riceOryza sativat0
- Treatment
- N ratee0
- Outcome
- Magnesium concentratione0
- Direction
- not affectede0
- Qualifier
- most soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Magnesium concentration exhibited an erratic effect, but it was not affected by the N rate in most soils”
t0“rice”
Claim · model-written summary
Nitrogen apparent recovery efficiency was unaffected by nitrogen rate.
- Taxon
- riceOryza sativat0
- Treatment
- N ratee0
- Outcome
- Nitrogen apparent recovery efficiencye0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen apparent recovery efficiency was not affected by the N rate”
t0“rice”
Claim · model-written summary
Nitrogen apparent recovery was approximately 49% at 80 kg N ha -1.
- Taxon
- riceOryza sativat0
- Treatment
- 80e0
- Outcome
- accounted fore0
- Value
- 49%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accounted for approximately 49% and 41% for 80 and 160 kg N ha -1 , respectively”
t0“rice”
Claim · model-written summary
Nitrogen apparent recovery was approximately 41% at 160 kg N ha -1.
- Taxon
- riceOryza sativat0
- Treatment
- 160 kg N ha -1e0
- Outcome
- accounted fore0
- Value
- 41%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accounted for approximately 49% and 41% for 80 and 160 kg N ha -1 , respectively”
t0“rice”
The same questions in other papers
nitrogen · nutrient: content · Oryza sativa (rice)Positive and negative results
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- positive
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