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J.R. Heckman

studies upon which those values are based are generally not cited ( Heckman et al., 2003 ). Over the course of the growing season, a crop will accumulate, in its biomass, certain amounts of each of the essential plant nutrients. Amounts of nutrient uptake

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

. The influence of water and N management on uptake of other nutrients during production for many crops has not been evaluated fully. With some woody perennial plants, growth is enhanced more by minimizing water stress than by increasing fertility ( Rose

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

uptake by container-grown nursery plants has primarily focused on N because it is the most important nutrient for plant growth ( Millard, 1996 ); and losses from production systems impact environmental quality ( Alt, 1998 ). Plants require other nutrients

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J. R. Davenport

Foliar feeding of crop plants is an increasingly popular practice. The use of foliar nutrients relies on the ability of the plant to sorb nutrients through the leaves. Cranberries (Vaccinium macrocarpon Ait.) are known to have a waxy cuticle on the leaf surface which may impede nutrient uptake, leaving only the lower leaf surface for effective uptake. This study was undertaken to determine the extent of foliar nutrient uptake by cranberries using rubidium as a tracer. Rubidium was chosen for its similarity to potassium in plant uptake. In replicated plots, cranberries were sprayed with rubidium at the rate recommended for foliar potassium at three different growth stages and three different times of day. Washed and unwashed leaves were analyzed one day, one week, and one month after rubidium applications. Stem, soil, and root material was analyzed for rubidium at the one week and one month sample times. Results will be discussed with reference to uptake and movement of foliar applied nutrients in cranberries.

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E. Niyonsaba, E. G. Rhoden and P. K. Biswas

The uptake of nutrients by sweetpotato (Ipomoea batatas) is critical in determining crop yield. Research was conducted to assess the effects of gypsum application on the nutrient uptake in three sweetpotato cultivars; `Carver II', `Georgia Jet' and `Jewel'. Gypsum application did not influence leaf P content of sweetpotato. However application of 3 tons per acre of gypsum increased leaf N and K content in `Carver II' and `Jewel' at 60 and 90 days after planting. There was a similar increase observed in Ca and Mg content of the leaf. While rate of gypsum did not influence nutrient uptake, date of sampling significantly influenced leaf nutrient concentration. It was noted that leaf K for `Jewel' and Ca for `Carver II' were greatest at 60 days after planting. Overall, Mg content was decreased following the application of gypsum in both `Carver II' and `Georgia Jet' cultivars.

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Pedro García-Caparrós, Alfonso Llanderal and María Teresa Lao

uptake efficiencies and their losses in the production of other containerized plants, but very little is known about the effects of salt stress on water and nutrient uptake efficiencies and their losses in fern leaf lavender grown in containers. Therefore

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Hao Wang and Mary Ann Rose

Nutrient uptake and allocation patterns of Forsythia ovata × europaea `Meadowlark' grown in a recirculating hydroponic system in the greenhouse were observed for 5 months. Dormant rooted cuttings were placed in the system on 8 May 1995. The nutrient solution supplied (in mg·L–1) 100 N, 48 P, 210 K, 30 Mg, 60 Ca, 117 SO4, 3 Fe, 0.5 Mn, 0.15 Zn, 0.15 Cu, 0.5 B, 0.1 Mo. Solutions were completely replaced every 2 weeks. Leaves, stems, and roots were harvested for dry weight and nutrient analysis at monthly intervals. Nitrogen uptake and dry-weight accumulation in the roots increased throughout the experiment, reaching a maximum in the fifth month (September). Nitrogen uptake and dry-weight accumulation of leaves and stems increased rapidly throughout the first 3 months, then leveled off. Whole-plant N recovery (N taken up/N in hydroponics system) reached a maximum (58%) between 6 July and 3 August. N recovery in the hydroponics system was about 10 times greater than what we observed in related experiments with woody plants in typical production environments, suggesting that there is potential for manipulating fertilization and cultural practices to increase fertilization efficiency in woody ornamentals. Nutrient recovery and accumulation patterns of P and K also will be presented.

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Takafumi Kinoshita and Masaharu Masuda

differences in the modes of nutrient uptake in CRF- and LF-treated plants. Xylem exudates were analyzed after stem decapitation to assess nutrient uptake by the plant. The volume of xylem exudates per unit of time can be used to measure the activity of water

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Elisa Solis-Toapanta, Paul Fisher and Celina Gómez

ions, considering the different uptake rate of nutrients by plants (e.g., active, intermediate, and passive) ( Bailey et al., 1988 ). However, factors such as system design and capacity, environmental conditions, water quality, type and quantity of

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Rumana Yeasmin, Stephen P. Bonser, Satoru Motoki and Eiji Nishihara

researched. Heat stress often decreases the uptake of nutrients in plant tissues or decreases the total content of nutrients in the plants, although effects can vary among nutrients and species ( Giri et al., 2017 ). Hungria and Kaschuk (2014) reported that