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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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Ada Baldi, Anna Lenzi, Marco Nannicini, Andrea Pardini, and Romano Tesi

Nitrogen, P, and K are the primary nutrients to be supplied to turfgrass through fertilizer application ( Beard, 1973 ; Turgeon, 2007 ). Nitrogen, being the nutrient required in greatest amounts by turfgrass, is the basic element of turf

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Brígida Resende Almeida, Suzan Kelly Vilela Bertolucci, Alexandre Alves de Carvalho, Heitor Luiz Heiderich Roza, Felipe Campos Figueiredo, and José Eduardo Brasil Pereira Pinto

, photosynthesis, and formation of the cell wall. The availability or absence of an element may induce changes in the biosynthetic pathways of plants ( Alvarenga et al., 2015 ). Plants may also manifest symptoms that are characteristic of each nutrient, depending

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Etienne L. LeRiche, Gefu Wang-Pruski, and Valtcho D. Zheljazkov

information such as how the tuber element content affects the change in ACD severity over time, it may become possible to predict the severity of ACD in tubers in late stages of storage by determining the element concentrations and their spatial distribution

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Ming Liu, Aijun Zhang, Xiaoguang Chen, Rong Jin, Hongmin Li, and Zhonghou Tang

the chlorophyll fluorescence parameters of two sweetpotato varieties. Discussion Plant growth and physiological response to K + deficiency. Plants require K + in a larger amount than any other mineral element except for N, and K + is a nutrient that

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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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Eun Young Yang*, Hye Jin Lee, and Yong-Beom Lee

The application of a closed hydroponic system for rose poses some horticultural problems. The nutrient uptake by the plants changes constantly depending upon environmental conditions and growing stages, which results in the imbalanced composition of the drained solution and aggravates root environmental conditions. This research was aimed to observe the effect of mineral nutrient control method on the nutrient solution management in a closed hydroponic system. Single-node cutting rose `Versillia' was grown in aeroponics and DFT system and was irrigated with the nutrient solution of the Univ. of Seoul (NO3 -N 8.8, NH4 -N 0.67, P 2.0, K 4.8, Ca 4.0, and Mg 2.0 me·L-1). Recirculated nutrient solution was managed by five different control method: macro- and micro-element control in aeroponic system (M&M); macroelement control in aeroponic system (M); nutrient solution supplement in aeroponic system (S); electrical conductivity (EC) control in aeroponic system (EC-A); EC control in deep flow technique system (EC-D). In the EC control method, the concentration of NO3 -N exceeds optimal range whereas P and Mg decreased at the later stage of plant growth. The overall mineral nutrient content increased with S. On the other hand, the nutrient content of root environment was maintained optimally with M&M and M.

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George J. Wulster and J. Benton Jones Jr.

Easter Lilies (Lilium Longiflorium) were grown in potting media containing 50% peatmoss and 50% vermiculite V/V or amended with 25, 33, or 50% (V/V) composted municipal sludge.

Macro and micro nutrient levels were determined for the various media formulations using either a water or a Mehlich III extraction procedure. Foliar levels of micro and macro nutrients were determined at anthesis. Final plant height and number of buds per plant were measured for each treatment.

No media formulations were phytotoxic; however, several micro element levels increased with increasing composted sludge content in foliar samples. These increasing foliar levels of Cu, Fe, Zn correlated well with media levels when Mehlich III was the extraction method. A similar correlation was not found with water as the extractant.

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T.R. Konsler, S.W. Zito, J.E. Shelton, and E.J. Staba

Abbreviations: RN, root tissue nutrients; SF; soil fertility; Tg, spectrophotometric measure of total ginsenosides. 1 Professor Emeritus. 2 Associate Professor. 3 Professor. Paper no. 12054 of the Journal Series of North Carolina Agricultural