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William R. Argo and John A. Biernbaum

Hybrid impatiens (Impatiens Wallerana Hook. F.) were planted in a peat-based medium containing two dolomitic liming materials (1.8 kg Ca(OH)2·Mg(OH)2/m3 or 8.4 kg CaCO3·MgCO3/m3) and subirrigated for 17 weeks using four irrigation-water sources (IWSs) with varied bicarbonate alkalinity, Ca2+, Mg2+, and SO4-S content and three water-soluble fertilizers (WSFs) that contained (in mg) 200N-20P-200K/liter but a variable NH4: NO3 ratio, Ca2+, Mg2+, and SO4-S content. The factorial arrangement of the IWS and WSF resulted in a range of Ca2+, Mg2+, and SO4-S concentrations varying by a factor of 10. After 8 weeks, medium pH ranged from 4.5 to 8.5. The maximum critical medium pH for PO4-P uptake was 7.4 to 7.7, which probably was due to a change in most of the water-soluble P to the less-available HPO4 2- form. Lime type did not affect the long-term increase in medium pH, Ca2+, and Mg2+ concentrations with nutrient solutions containing low NH4 +-N and high Ca2+ and Mg2+. The carbonate lime buffered the medium pH and Ca2+ and Mg2+ concentrations with nutrient solutions containing high NH4 +-N and low Ca2+ and Mg2+ compared to that measured with the hydrated lime. With both lime types, there was a linear increase in tissue Ca and Mg as the applied concentrations of the various nutrient solutions increased from 18 to 210 mg Ca2+/liter and 7 to 90 mg Mg2+/liter. The relationship was similar for both lime types up to week 8, after which tissue Ca and Mg decreased more rapidly with the hydrated lime and low solution Ca2+ and Mg2+ compared to that of the same carbonate lime treatments. The minimum critical SO4-S concentration in the applied nutrient solution for plant uptake was 30 to 40 mg S/liter. Below this concentration, tissue S decreased rapidly; above, there was little effect on tissue S.

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M.C. Bolarín, F.G. Fernández, V. Cruz, and J. Cuartero

Abbreviations: EC, electrical conductivity; LDW, leaf dry weight; SDW, stem dry weight. This research has been supported by CAICYT (Project no. PA-85/140). The cost of publishing this paper was defrayed in part by the payment of page charges. Under

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Y. Saranga, D. Zamir, A. Marani, and J. Rudich

Abbreviations: acc., accessions; ECe, electrical conductivity of saturated soil extract; ECi, electrical conductivity of irrigation water; Lc, Lycopersicon cheesmanii ; Le, Lycopersicon esculentum ; Lpen, Lycopersicon pennellii ; Lper

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Maria Papafotiou, Barbara Avajianneli, Costas Michos, and Iordanis Chatzipavlidis

., Hanover, Penn.) 20 N-11.27 P-16.6 K-0.025 Mg-0.02 B-0.05 Cu-0.10 Fe-0.05 Mn-0.001 Mo-0.05 Zn (2 g·L −1 , 400 mg·L −1 N, 100 mL of solution per pot). Every 50 d during the experimental period, measurements of the media pH and electrical conductivity (EC

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Yuki Sago and Airi Shigemura

determinations of nitrate absorption in plants of marketable size. Table 1. Nitrate concentrations in starter solution and cultivation under electrical conductivity (EC), EC control management (ECM), and quantitative nutrient management (QNM). Sample measurements

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Huan-Ying Yao, Ren-Shih Chung, Sheng-Bin Ho, and Yao-Chien Alex Chang

collected and tested for pH and electrical conductivity (EC) by a pH and EC meter (IQ170; IQ Scientific Instruments, Carlsbad, CA), and the volume of leachate collected was also measured. The experiment was conducted in a completely randomized design with 20

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Job Teixeira de Oliveira, Rubens Alves de Oliveira, Domingos Sarvio Magalhães Valente, Isabela da Silva Ribeiro, and Paulo Eduardo Teodoro

. Pearson ( A ) and Moran ( B ) correlations networks of attributes studied: garlic yield (GY), apparent soil electrical conductivity (EC), resistance to penetration (RP1, RP2, RP3, RP4), mechanical resistance to penetration (MRP), soil volumetric moisture

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Jeremy R. Pinto, Rhiannon A. Chandler, and R. Kasten Dumroese

not pose problems, including salt burn, reduced growth, and interference with mineral nutrient uptake ( Dumroese et al., 2007 ); Scoggins (2005) summarizes acceptable electrical conductivity (EC) ranges for several herbaceous perennials. In

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Genhua Niu, Denise S. Rodriguez, and Mengmeng Gu

solution was made by adding 0.5 g·L −1 of 20N−8P−16K (Peter's 20−20-20; The Scotts Company LLC, Allentown, PA) to tap water resulting in a nutrient solution with electrical conductivity (EC) of 1.6 dS·m −1 . The major ions in tap water were Na + , Ca 2

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Gary R. Bachman and James D. Metzger

levels, substrate pH, and electrical conductivity (EC) of the 0%, 10%, 20%, 40%, and 100% amended substrates were determined for PVC and BVC through analysis performed at the Ohio State University Research and Extension Analytical Laboratory, Wooster (PVC