Abstract
The objectives of this study were to determine the effects of phosphorus application, air temperature, soil moisture regime and soil pH on the yield response of, and soil phosphorus availability to, alfalfa (Medicago sativa L ’Saranac’). The following treatments were used in factorial combination: three moisture regimes: (1) semi-dry, with soil moisture between FC (100% of available water or field capacity) and WP (0% of available water or wilting point), (2) optimal, between FC and 70% of available water, (3) wet, between saturation point and FC; three rates of phosphorus in the form of disodium phosphate (0, 12.5 and 25.0 P kg −1 of dry soil; and three soil pH levels: original (5.2 or 5.7), 6.5 and 7.5. Half of the alfalfa was grown in a warm greenhouse section with a minimum daytime temperature of 25 °C and 19 °C at night and the other half in a cool section with a daytime minimum of 15 °C and 9 °C at night. Although shoot yields were higher under warm than under cool conditions, yield response to phosphorus was greater under cool than warm growing conditions. Yield increases due to phosphorus were linear under optimum and wet soil moisture regimes and nonsignificant under the semi-dry regime. Phosphorus application increased root weight by 18% under the cool regime compared to 14% in the warm greenhouse. Phosphorus uptake by alfalfa increased with increasing rates of soil-applied P, except in semi-dry soils at warm temperature, where no effect of P on P uptake was recorded. Phosphorus uptake increased significantly with soil pH and was higher under warm temperature and optimal water regime.Key words: Phosphorus fertilization, available phosphorus, alfalfa, soil moisture regime, air temperature, phosphorus uptake
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Claims 10
Claim · model-written summary
Shoot yields were higher in warm than cool conditions.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- warme0
- Outcome
- shoot yieldse0
- Direction
- highere0
- Comparator
- cool conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot yields were higher under warm than under cool conditions”
t0“alfalfa (Medicago sativa L ’Saranac’)”
Claim · model-written summary
Yield response to phosphorus was greater in cool than warm conditions.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- phosphoruse0
- Outcome
- yield responsee0
- Direction
- greatere0
- Comparator
- warm growing conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield response to phosphorus was greater under cool than warm growing conditions”
t0“alfalfa (Medicago sativa L ’Saranac’)”
Claim · model-written summary
Phosphorus produced linear yield increases under optimum and wet moisture.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- phosphoruse0
- Outcome
- Yielde0
- Direction
- increasese0
- Qualifier
- optimum and wet soil moisture regimese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield increases due to phosphorus were linear under optimum and wet soil moisture regimes”
t0“alfalfa (Medicago sativa L ’Saranac’)”
Claim · model-written summary
Phosphorus yield response was nonsignificant under semi-dry moisture.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- phosphoruse1
- Outcome
- yield responsee1
- Qualifier
- semi-dry regimee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nonsignificant under the semi-dry regime”
t0“alfalfa (Medicago sativa L ’Saranac’)”
e1“yield response to phosphorus was greater under cool than warm growing conditions”
Claim · model-written summary
Phosphorus increased root weight by 18% under cool conditions.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Phosphorus applicatione0
- Outcome
- root weighte0
- Direction
- increasede0
- Value
- 18%e0
- Qualifier
- cool regimee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus application increased root weight by 18% under the cool regime”
t0“alfalfa (Medicago sativa L ’Saranac’)”
Claim · model-written summary
Phosphorus increased root weight by 14% in the warm greenhouse.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Phosphorus applicatione0
- Outcome
- root weighte0
- Direction
- increasede0
- Value
- 14%e0
- Qualifier
- warm greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus application increased root weight by 18% under the cool regime compared to 14% in the warm greenhouse”
t0“alfalfa (Medicago sativa L ’Saranac’)”
Claim · model-written summary
Alfalfa phosphorus uptake increased with soil-applied phosphorus rate.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- soil-applied Pe0
- Outcome
- Phosphorus uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus uptake by alfalfa increased with increasing rates of soil-applied P”
Claim · model-written summary
Soil-applied phosphorus did not affect uptake in semi-dry soils at warm temperature.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Pe0
- Outcome
- P uptakee0
- Direction
- no effecte0
- Qualifier
- semi-dry soils at warm temperaturee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in semi-dry soils at warm temperature, where no effect of P on P uptake was recorded”
t0“alfalfa (Medicago sativa L ’Saranac’)”
Claim · model-written summary
Phosphorus uptake increased with soil pH.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- Phosphorus uptakee0
- Direction
- increasede0
- Setting
- soil pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus uptake increased significantly with soil pH”
t0“alfalfa (Medicago sativa L ’Saranac’)”
Claim · model-written summary
Phosphorus uptake was higher in warm temperature and optimal water regime.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- Phosphorus uptakee0
- Direction
- highere0
- Setting
- warm temperature and optimal water regimee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus uptake increased significantly with soil pH and was higher under warm temperature and optimal water regime”
t0“alfalfa (Medicago sativa L ’Saranac’)”
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