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Andrew G. Ristvey, John D. Lea-Cox and David S. Ross

than 1.5% in the high P treatments of 25 mg/week. Phosphorus uptake efficiencies would have dropped to ≈20% for azaleas given the sufficient P rate of 5 mg/week compared with the calculated range of 40.1% to 49.2% ( Table 3 ). Interestingly, the uptake

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Jonathan M. Frantz

on overall P uptake efficiency and WUE. As a result of this research, appropriate rates of P supply could be identified and estimates of under- or oversupply could be made. Materials and Methods Seeds of vinca ‘Cooler Grape’ were sown 7 July 2009 in

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Silvia Jiménez, Mónica Pérez, Blanca María Plaza, Roberto Salinas and María Teresa Lao

use efficiency of 35, 38, and 43 g·g −1 . In this way, the use of NH 4 + -N or a combination NH 4 + –NO 3 – in the nutrient solution improves P use efficiency. Empirical models of phosphorus uptake and phosphorus uptake concentration

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Carolyn F. Scagel, Guihong Bi, Leslie H. Fuchigami and Richard P. Regan

.D. Ross, D.S. 2007 Nitrogen and phosphorus uptake efficiency and partitioning of container-grown azalea during spring growth J. Amer. Soc. Hort. Sci. 132 563 571 Rose, M.A. Rose, M. Wang, H. 1999 Fertilizer concentration and moisture tension affect growth

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Carolyn F. Scagel, Guihong Bi, Leslie H. Fuchigami and Richard P. Regan

relationships between uptake of different nutrients will aid in the development of fertilizer management strategies that increase fertilizer efficiency by synchronizing nutrient availability with nutrient demand and maintain stable internal nutrient ratios. This

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Pedro García-Caparrós, Alfonso Llanderal and María Teresa Lao

(28% lower compared with the control), whereas phosphorus uptake efficiency (PUE) increased with higher EC (4.5 and 7.5 dS · m −1 ) (23% and 26%, respectively, compared with the control). Similarly, Ristvey et al. (2007) also reported an increase in

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María José Jiménez-Moreno and Ricardo Fernández-Escobar

( Thornton et al., 2014 ). Phosphorus uptake, cycling, and use efficiency has been investigated intensively with annual plants, but little is known in perennial, woody plants ( Rennenberg and Herschbach, 2013 ). In deciduous trees, P is remobilized from

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Hala G. Zahreddine, Daniel K. Struve and Salma N. Talhouk

content of seedlings raised from two Malus trilobata trees and one Acer syriacum tree when grown under either 25 or 100 mg·L −1 N water-soluble fertilizer. Nutrient uptake and nutrient use efficiencies. For both species, there was no

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Valéria Santos Cavalcante, Renato de Mello Prado, Ricardo de Lima Vasconcelos, Hilário Júnior de Almeida and Thais Ramos da Silva

content of selected nutrients Food Res. Intl. 43 1833 1843 Swiader, J.M. Chyan, Y. Freiji, F.G. 1994 Genotypic differences in nitrate uptake and utilization efficiency in pumpkin hybrids 1 J. Plant Nutr. 17 1687 1699 Vance, C.P. Uhde-Stone, C. Allan, D

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Pascal Nzokou and Bert M. Cregg

various agricultural crops also indicated accumulation of phosphorus, magnesium, potassium, and carbon under drought stress ( Jenne et al., 1958 ). Another important process that affects the availability and uptake of nutrients under well