Abstract
Abstract The timeliness of P availability to a plant is important for maximum plant growth. There is little information pinpointing the critical time(s) in the life cycle of winter wheat ( Triticum aestivum L.) at which P uptake is the most important for maximum growth response. The objectives of this research were: i) to determine the effects of removing P from the growing medium during progressive stages of growth on dry matter production and P uptake of winter wheat; and ii) to compare the P demand pattern of winter wheat with that known for spring wheat. ‘Centurk’ winter wheat was grown using a modified Hoagland's nutrient solution in a greenhouse environment. Treatments consisted of evaluating the plant response to the time grown with and without available P in the nutrient solution. This was accomplished by replacing the complete nutrient solution with a nutrient solution devoid of P and allowing plants to continue growth to physiological maturity. Winter wheat had taken up sufficient P by the first node stage to ensure maximum dry matter production of the mature roots and tops. Phosphorus availability in later growth stages did not significantly increase mature root and top dry matter production. Maximum grain yield at maturity, however, was only realized when P was available through the mealy‐ripe stage (Feekes' Scale 11.2) of grain development. It appears that after noding stage only a small amount of P may be needed to allow carbohydrate translocation mechanisms to function. Spring wheat differs from winter wheat in that it only requires adequate P up to heading to produce maximum grain yields.
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Claims 6
Claim · model-written summary
Winter wheat had sufficient P by first node stage for maximum mature root dry matter.
- Taxon
- Winter wheat
Triticum aestivume0 - Organ / stage
- mature rootse0
- Outcome
- dry matter productione0
- Direction
- maximume0
- Qualifier
- by the first node stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winter wheat had taken up sufficient P by the first node stage to ensure maximum dry matter production of the mature roots and tops.”
Claim · model-written summary
Winter wheat had sufficient P by first node stage for maximum mature top dry matter.
- Taxon
- Winter wheatTriticum aestivume0
- Organ / stage
- topse0
- Outcome
- dry matter productione0
- Direction
- maximume0
- Qualifier
- by the first node stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winter wheat had taken up sufficient P by the first node stage to ensure maximum dry matter production of the mature roots and tops.”
Claim · model-written summary
Later phosphorus availability did not significantly increase mature root dry matter.
- Taxon
- Winter wheatTriticum aestivume1
- Treatment
- Phosphorus availability in later growth stagese0
- Outcome
- mature root and top dry matter productione0
- Direction
- did not significantly increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus availability in later growth stages did not significantly increase mature root and top dry matter production.”
e1“Winter wheat had taken up sufficient P by the first node stage”
Claim · model-written summary
Maximum grain yield required phosphorus through the mealy-ripe stage.
- Taxon
- winter wheatTriticum aestivume1
- Organ / stage
- mealy‐ripe stagee0
- Treatment
- P was available through the mealy‐ripe stagee0
- Outcome
- grain yielde0
- Direction
- Maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum grain yield at maturity, however, was only realized when P was available through the mealy‐ripe stage (Feekes' Scale 11.2) of grain development.”
e1“winter wheat ( Triticum aestivum L.)”
Claim · model-written summary
The authors suggest only a small amount of P may be needed after noding for carbohydrate translocation.
- Taxon
- winter wheatTriticum aestivume1
- Outcome
- carbohydrate translocation mechanisms to functione0
- Qualifier
- after noding stage only a small amount of P may be needede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It appears that after noding stage only a small amount of P may be needed to allow carbohydrate translocation mechanisms to function.”
e1“winter wheat ( Triticum aestivum L.)”
Claim · model-written summary
Spring wheat required adequate P only through heading for maximum grain yield.
- Taxon
- Spring wheatTriticum aestivume0
- Outcome
- grain yieldse0
- Direction
- maximume0
- Qualifier
- adequate P up to headinge0
- Comparator
- winter wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat differs from winter wheat in that it only requires adequate P up to heading to produce maximum grain yields.”
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