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Ustun Sahin, Melek Ekinci, Fatih Mehmet Kiziloglu, Ertan Yildirim, Metin Turan, Recep Kotan, and Selda Ors

of bars indicate differences (least significant difference test, P < 0.05). Mean separation within each year. ns = nonsignificant. Plant nutrient element content. The concentrations of plant nutrient elements in the leaves of lettuce in response

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Huseyin Karlidag, Ertan Yildirim, Metin Turan, Mucahit Pehluvan, and Figen Donmez

efficiency. Previous studies have reported that salinity conditions drastically decreased the plant nutrient element content of the leaves and roots of strawberry plants with the exception of Na and Cl, which increased under salt stress ( Karlidag et al

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Chia-Yun Ko, Tsai-Yun Lin, Chin-Wen Ho, and Jei-Fu Shaw

To establish a mass micropropagation procedure for Cephalotus follicularis, the effects of varying the strengths of solid Murashige and Skoog (MS) medium were investigated using subcultured shoot explants. After a 60-day primary culture from root mass, the regenerated shoot explants were subcultured every 60 days in solid MS medium. To facilitate shoot proliferation, liquid MS medium was applied with or without exogenous auxin and cytokinin. Our results demonstrate that shoot proliferation and survival of C. follicularis is most effective in modified MS (MMS) medium containing one-fifth or one-tenth strength macronutrients and full-strength micronutrients. Successful shoot proliferation and development of C. follicularis explants were obtained in one-fifth or one-tenth modified liquid MS medium without auxin and cytokinin or with addition of 5 μM indole 3-acetic acid/1 μM N6-benzyladenine for 45 days. The liquid medium consistently produced more explants than the solid medium and shortened the culturing time. Plantlets cultured in hormone-free one-fifth MMS medium developed greater root systems. Using the liquid culture we established, vigorous plants with extensive roots were obtained within 4 months. Plant survival in the greenhouse reached 100%.

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A. Matar, W.L. Berry, C.L. Mackowiak, G.W. Stutte, R.M. Wheeler, and J.C. Sager

Tissue nutrient (element) content profiles were determined for wheat and potato plants grown hydroponically (NFT) in NASA's Biomass Production Chamber (20 m2) using a complete nutrient solution with electrical conductivity maintained at 0.12 S·m–1. Profiles were compared to patterns of nutrient accumulation during vegetative stages reported for highly productive wheat and potatoes grown in the field under a wide range of conditions. Among the essential elements, differences between the hydroponically and field-grown crops were observed only for Ca, Mg, and Mn in the recently mature leaves, and these differences were related to changes in growth phase and/or consistency of nutrient supply during plant growth. Nutrient profiles for both hydroponically and field-grown crops were also compared to deficiency and toxicity critical levels compiled by various workers. As expected for high-yielding crops, the profiles for both crops were well within the sufficiency ranges for all evaluated nutrients.

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M. Leonard Wells and Bruce W. Wood

element content of pecan leaves to the yield of nuts Proc. Southeastern Pecan Growers' Assn. 48 77 Hunter, J.H. Hammar, H.E. 1947 The results of applying different fertilizers to the Moore variety of pecan over a ten-year period Proc. Southeastern Pecan

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Ertan Yildirim, Huseyin Karlidag, Metin Turan, Atilla Dursun, and Fahrettin Goktepe

values increased values with PGPR treatments ( Table 2 ; Fig. 1 ). Effects of biofertilizer on plant nutrient element content. Results showed bacterial inoculations significantly affected ionic compositions of plant leaves ( Fig. 1 ). In this study, the

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Safwan Shiyab

. 1995 Effect of chromium on nutrient element content and morphology of tomato J. Plant Nutr. 18 4 829 834 Nag, P. Paul, A.K. Mukherjee, S. 1981 Heavy metal effects in plant tissues involving chlorophyll, chlorophyllase, Hill reaction activity, and gel