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Timothy K. Hartz, P. R. Johnstone, E. Williams, and R.F. Smith

nutrient ranges ( Needham et al., 1990 ). Hartz et al. (1998) used DRIS analysis to calculate leaf nutrient norms for processing tomato ( Lycopersicon esculentum Mill.) and used those norms and the variance in nutrient concentrations among high

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Andrew P. Pond, James L. Walworth, Michael W. Kilby, Richard D. Gibson, Robert E. Call, and Humberto Núñez

Measurement of nutrients in leaf tissue is a practical method of monitoring the nutritional status of perennial crops such as pecan (Carya illinoinensis, Wang. C. Koch). Accurate interpretations require known standard concentrations for the crop and region. To determine standard concentrations for pecans, focusing on those grown in the desert southwest, we conducted a survey of 135 `Western Schley' pecan trees in Arizona for 2 years. Leaf nutrient concentrations and yield were collected for each tree. Leaf nutrient concentrations from the highest yielding trees (50th yield percentile) were used to calculate a mean and CV for each nutrient. Results were compared with data from New Mexico, Georgia, and Sonora, Mexico. Relatively large differences were noted in mean K, Ca, B, Cu, Fe, Mn, and Zn levels. Nutrient interpretation ranges were calculated based on Arizona population statistics using the balance index method.

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Geno A. Picchioni, Sharon A. Martinez, John G. Mexal, and Dawn M. VanLeeuwen

; Nau, 2011 ; Wright et al., 2008 ). In light of nutrient limitations reported in pine-based substrates and our preliminary findings on pecan wood, we hypothesized: 1) garden chrysanthemum would express significant increases in growth and leaf nutrient

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Bernadine C. Strik and Amanda J. Vance

the season ( Krewer et al., 2007 ). Leaf nutrient status, as compared with published sufficiency levels ( Hart et al., 1992 , 2006 ; Krewer et al., 2007 ), coupled with observations of plant growth are used to develop nutrient management programs

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Michael V. Mickelbart

Leaf nutrient status is an important tool for growers in determining fertilizer needs in ornamental species. This is especially true as consciousness and regulation of fertilizer runoff and leaching into groundwater increases. However, growers

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Patrick H. Brown

Concentrations of N, P, K, Ca, Mg, B, Fe, Cu, Zn, and Mn in mature commercial fig (`Calimyrna'; `Sari Lop') leaves are presented throughout the growing season. These data can be used as preliminary norms for the interpretation of tree nutrient status for high-yielding commercial fig orchards. In comparison with other deciduous tree crops growing in the same regions {almond [Prunus amygdalus Batsch syn. P. dulcis (Mill) D.A. Webb], walnut (Juglans regia L.), peach [Prunus persica (L.) Batsch]}, productive fig trees have relatively low leaf N, P, and K concentrations (2.1%, 0.1%, and 1.0% dry weight, respectively) in July, although tissue Mn and Ca concentrations often exceed those typically found in other deciduous species growing in the same soils. Seasonal variations in fig leaf nutrient concentrations are similar to those of other tree crops. Marked declines in tissue K and N concentrations toward the end of the season may indicate a need for supplemental N and K fertilization in highly productive orchards. The potential for K deficiency in fig also is indicated by the generally lower leaf K concentrations in the low-vigor orchards examined.

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Ricardo Goenaga, Heber Irizarry, David Jenkins, Debbie Boykin, and Angel Marrero

other rootstock seedlings. Fig. 1. Average leaf nutrient concentration of major elements [nitrogen (N), phosphorous (P), potassium (K), calcium (Ca), magnesium (Mg)] in ‘Prolific’ sapodilla grafted onto seedlings of 16 sapodilla rootstocks sampled (A

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Mehdi Sharifi, Julia Reekie, Andrew Hammermeister, Mohammed Zahidul Alam, and Taylor MacKey

crops, or mixtures, using a modified SSS on apple yields, tree growth, and leaf nutrient concentrations in an organic apple orchard in Nova Scotia, Canada. Materials and Methods The study was conducted at Boates Farms Limited, a 10 ha certified organic

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George E. Boyhan, Reid L. Torrance, and C. Randy Hill

evaluated for their effect on yield and leaf nutrient status. Materials and Methods All experiments were conducted at the Vidalia Onion and Vegetable Research Center (VOVRC) in Lyons, Ga. (lat. 32°11′N, long. 82°17′W) on a Tifton soil (fine

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Haytham Z. Zaiter, Dermot P. Coyne, Ralph B. Clark, and James R. Steadman

Nine bean cultivars/lines (Phaseolus vulgaris L.) were grown in three soils/rooting media at pH values of 7.9, 6.5, and 5.8 in greenhouse, growth chamber, and field experiments to evaluate the leaf reaction of the plants to a Nebraska bean rust [Uromyces appendiculatus (Pers.) Unger var. appendiculatus] isolate US85-NP-10-1. Significant differences were observed for rust pustule diameter between cultivars/lines grown in the three growth media. Plants grown in the medium at pH 5.8 showed significantly larger rust pustule diameters than those of plants grown at pH 6.5 or 7.9. A significant interaction occurred between growth medium and cultivars/lines for the rust reaction. Concentrations of Cl and Mn in leaves were positively correlated with rust pustule diameter. In contrast, concentration of K in leaves was negatively correlated with rust pustule diameter. Plant breeders attempting to improve beans for rust resistance must consider the growth medium pH in evaluating intensity and severity of rust symptoms on leaves.