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Mohammed B. Tahboub, William C. Lindemann, and Leigh Murray

, phosphorus (P), and potassium (K) ( Table 1 ). The N content (0.34%) of the pecan wood chips used in 2002 was used to estimate the C:N ratio (143:1) of pecan wood based on an assumed 48.5% carbon content ( Lamlom and Savidge, 2003 ). Five random wood chip

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Chi M. Do, Kate L. Delaporte, Vinay Pagay, and Carolyn J. Schultz

, area, and thickness by ≈20% ( Alireza et al., 2013 ). In addition to changes in growth parameters, many plants show changes in ion accumulation in roots and/or leaves or shoots, with contrasting trends for sodium and potassium accumulation. There is

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Timothy K. Broschat

Ixoras (Ixora L.) growing in calcareous sandy soils are highly susceptible to a reddish leaf spot disorder. Symptoms appear on the oldest leaves of a shoot and consist of irregular diffuse brownish-red blotches on slightly chlorotic leaves. Symptoms of K deficiency, P deficiency, and both K and P deficiency were induced in container-grown Ixora `Nora Grant' by withholding the appropriate element from the fertilization regime. Potassium-deficient ixoras showed sharply delimited necrotic spotting on the oldest leaves, were stunted in overall size, and retained fewer leaves per shoot than control plants. Phosphorus-deficient plants showed no spotting, but had uniformly brownish-red older leaves and olive-green younger foliage. Plants deficient in both elements displayed symptoms similar to those observed on landscape plants. Symptomatic experimental and landscape ixoras all had low foliar concentrations of both K and P.

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James E. Altland and James C. Locke

Fig. 1. Nitrate, phosphate, and potassium leaching from 85:15 sphagnum peat:perlite substrates amended with 0%, 1%, 5%, or 10% biochar. Columns were initially fertilized with 200 mL a 100 mg·L −1 nitrogen fertilizer (20N–4.3P–16.6K) solution. Columns

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Laban K. Rutto, Myong-Sook Ansari, and Michael Brandt

performance in season 2 than in season 1 ( Fig. 2 ). Table 3. Three-way analysis of variance for main effects and interactions of nitrogen (N), potassium (K), and season (summer and fall) on growth and biomass yield in stinging nettle grown under greenhouse

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Kathryn M. Santos, Paul R. Fisher, and William R. Argo

research has found an increase in nitrogen, phosphorus, and potassium when fertilizer was applied by root formation, our question was whether this uptake was occurring through some combination of basal and foliar uptake. Therefore, we wanted to determine if

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Jared Barnes, Paul Nelson, Brian E. Whipker, David A. Dickey, Dean Hesterberg, and Wei Shi

treatments from three nutrients at five levels. Nitrogen levels increase from the front to the back of the diagram (right sides of smaller cubes), phosphorus concentrations increase from the left to the right (tops of the smaller cubes), and potassium

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Earl E. Albregts, George J. Hochnmth, Craig K. Chandler, John Cornell, and Jay Harrison

`Oso Grande' and `Sweet Charlie' strawberries (Fragaria × ananassa Duch.) in 1991-92 and `Oso Grande' and `Seascape' in 1992-93 were grown in a K fertilization study using polyethylene-mulched and fumigated beds. Potassium was injected weekly into the drip irrigation system at 0.28,0.56,0.84, 1.12, and 1.40 kg K/ha per day. Early, March, and total-season marketable fruit yields were not affected by K rate during either season. The average fruit weight of `Oso Grande' for the early, March, and total-season harvest periods in the 1992-93 season decreased with increased K rate. For the same harvest periods, `Seascape' average fruit weight increased, decreased, and did not change, respectively, with increased K rate. Cull fruit yield during both seasons and fruit firmness during the 1992-93 season were not affected by K rate. Petiole sap, whole leaf, and leaf blade K concentrations increased with increasing K rates on most sampling dates during both seasons. `Oso Grande' and `Sweet Charlie' produced similar total marketable fruit yields the first season, but `Oso Grande' produced higher total yields than `Seascape' during all harvest periods of the second season.

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Michael A. Fidanza, David L. Sanford, David M. Beyer, and David J. Aurentz

O 5 ), potash (K 2 O), calcium (Ca), magnesium (Mg), sulfur (S), sodium (Na), aluminum (Al), iron (Fe), manganese (Mn), copper (Cu), and zinc (Zn). Although laboratory results reported P 2 O 5 and K 2 O values, actual phosphorus (P) and potassium (K

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Tyler C. Hoskins, James S. Owen Jr., Jeb S. Fields, James E. Altland, Zachary M. Easton, and Alex X. Niemiera

. Brown and Pokorny (1977) reported that soluble potassium applied to the top of a pine bark-filled column resulted in K + adsorption to the bark and that the distribution of that adsorbed K + was uneven throughout the column with most retained in the