Abstract
A field experiment was conducted to deter- mine the seasonal patterns of arbuscular mycorrhiza (AM) in a dryland winter wheat (Triticum aestivum L.) system and to determine wheat growth and P uptake responses to inoculation with mycorrhizal fungus. Broadcast-incorporated treatments included (1) no ino- culation with mycorrhizal fungus, with and without P fertilizer, and (2) mycorrhizal fungal inoculation at a rate of 5000 spores of Glomus intraradices (Schenck and Smith), per 30 cm in each row, with and without fertilizer P. Winter wheat was seeded within a day after treatments were imposed, and roots were sampled at five growth stages to quantify AM. Shoot samples were also taken for determination of dry matter, grain yield and yield components, and N and P uptake. No AM infection was evident during the fall months following seeding, which was characterized by low soil tempera- ture, while during the spring, the AM increased grad- ually. Increases in wheat grain yields by enhanced AM were of similar magnitude to the response obtained from P fertilization. However, responses differed at in- termediate growth stages. At the tillering stage, P up- take was mainly increased by P fertilization but not by fungal inoculation. At harvest, enhanced AM increased P uptake regardless of whether or not fertilizer P was added. The AM symbiosis increased with rising soil temperatures in the spring, in time to enhance late-sea- son P accumulation and grain production.
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Claims 5
Claim · model-written summary
AM infection was absent in fall and increased during spring.
- Taxon
- winter wheat
Triticum aestivumt0 - Outcome
- AM infectione0
- Direction
- increased grad- uallye0
- Qualifier
- during the springe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No AM infection was evident during the fall months following seeding, which was characterized by low soil tempera- ture, while during the spring, the AM increased grad- ually.”
t0“winter wheat”
Claim · model-written summary
Enhanced AM increased wheat grain yield with a response similar in magnitude to P fertilizer.
- Taxon
- wheatTriticum aestivume0
- Treatment
- enhanced AMe0
- Outcome
- wheat grain yieldse0
- Direction
- Increasese0
- Comparator
- P fertilizatione0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in wheat grain yields by enhanced AM were of similar magnitude to the response obtained from P fertilization.”
Claim · model-written summary
At tillering, P fertilizer increased P uptake.
- Taxon
- winter wheatTriticum aestivumt0
- Organ / stage
- tillering stagee0
- Treatment
- P fertilizatione0
- Outcome
- P up- takee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the tillering stage, P up- take was mainly increased by P fertilization but not by fungal inoculation.”
t0“winter wheat”
Claim · model-written summary
At tillering, fungal inoculation did not increase P uptake.
- Taxon
- winter wheatTriticum aestivumt0
- Organ / stage
- tillering stagee0
- Treatment
- fungal inoculatione0
- Outcome
- P up- takee0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the tillering stage, P up- take was mainly increased by P fertilization but not by fungal inoculation.”
t0“winter wheat”
Claim · model-written summary
At harvest, enhanced AM increased P uptake regardless of P fertilizer.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- enhanced AMe0
- Outcome
- P uptakee0
- Direction
- increasede0
- Qualifier
- regardless of whether or not fertilizer P was addede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At harvest, enhanced AM increased P uptake regardless of whether or not fertilizer P was added.”
t0“winter wheat”
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