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R. Paul Schreiner and Tian Tian

Grapevines ( Vitis vinifera L.) are highly reliant on arbuscular mycorrhizal fungi (AMF) to obtain ample phosphorus (P) from the red hill soils used for vineyards in western Oregon ( Schreiner, 2007 ). Grapevines are particularly receptive

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John C. Majsztrik and John D. Lea-Cox

, Pennsylvania, Virginia, Washington, DC, and the EPA. This was soon replaced by an updated agreement in 1987, because it had no specific goals or methods to reach those goals. The 1987 agreement sought to reduce the nitrogen (N) and phosphorus (P) loads entering

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R. Paul Schreiner

western Oregon use foliar sprays of B (often mixed with fungicides) early in the season or postharvest to ensure that vines are not limited by this nutrient. Foliar sprays of macronutrients [nitrogen (N), phosphorus (P), potassium (K) calcium (Ca

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Jacob H. Shreckhise, James S. Owen Jr., Alexander X. Niemiera, and James E. Altland

Phosphorus (P) is an essential plant mineral nutrient, and soilless substrates used for container-based nursery production contain insufficient P levels for crop requirements ( Yeager and Wright 1982a ). Thus, P fertilization is necessary to

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C. R. Johnson and R. L. Hummel

Abstract

Roots of Carrizo citrange seedlings were inoculated with the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus intraradices or provided an inoculum filtrate (non-VAM plants). Plants were exposed to drought stress after transplanting into large containers filled with a phosphorus amended medium (30 mg g-1). Drought stress caused reduction of phosphorus in leaf tissues and dry matter accumulation in VAM plants. However, phosphorus levels, dry weights, and transpiration of VAM seedlings were greater than non-VAM plants. Mychorrhizal infection appears to improve establishment of citrus into transplant situations by improving phosphorus uptake and reducing plant stress.

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Arthur Villordon, Jeffrey Cole Gregorie, Don LaBonte, Awais Khan, and Michael Selvaraj

‘Beauregard’ sweetpotato subjected to phosphorus deficiency and compaction treatments. Mean comparisons were performed on transformed data: log 10 transformed (quantitative data), square root transformed (counts), and arcsine transformed (ratios

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L. Espinoza, C.A. Sanchez, and T.J. Schueneman

Four field experiments were conducted during two production seasons to evaluate soil-test P fertilizer recommendations for celery (Apium graveolens var. dulce) produced on Histosols, which often are linked hydrologically to environmentally sensitive wetlands, and to evaluate band placement as a strategy for improving P fertilizer-use efficiency in celery in such areas. Phosphorus was applied (broadcast or banded) at 0,50, 100,150, and 200 kg P/ha. Broadcast P was surface-applied and disked into the soil ≈ 15 cm deep 1 day before planting. Banded P was applied 5 cm below the soil surface and 5 cm to the side of each celery row. Total above-ground mass, marketable trimmed yield of celery, and yield of the larger grade sizes increased with P rate in all experiments. Band P placement was not a viable strategy for improving P fertilizer-use efficiency for celery. However, our results indicate that previous soil-test-based P fertilizer recommendations for celery were too high for the cultivars grown currently, and improved P fertilizer-use efficiency can be obtained with revised soil-test calibrations.

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Kathryn M. Santos, Paul R. Fisher, Thomas Yeager, Eric H. Simonne, Hannah S. Carter, and William R. Argo

70% and 80% in Weeks 2 and 3 with the combination of a more developed root systems and reduced irrigation frequency. Fig. 3. Nitrogen ( A ), phosphorus ( B ), and potassium ( C ) in leachate, substrate, and tissue over time for plants receiving

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Yan Zhang, Cuiyue Liang, Yan Xu, Thomas Gianfagna, and Bingru Huang

) and leaf photochemical efficiency ( B ) for SAG12-ipt transgenic line (S41) and the null transformant (NT) line of creeping bentgrass at 0, 7, and 21 d of full nutrient solution, no nitrogen (−N), or no phosphorus (−P) treatment. S41, S41-P, and S41

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R. Paul Schreiner and Carolyn F. Scagel

roots undergo extensive and specific reprogramming during arbuscular mycorrhizal development Plant J. 69 510 528 Graham, J.H. Leonard, R.T. Menge, J.A. 1982 Interaction of light intensity and soil temperature with phosphorus inhibition of vesicular