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Yan Chen, Regina P. Bracy, Allen D. Owings, and Joey P. Quebedeaux

. Leaf tissue N concentrations of seven herbaceous perennials at 5 months after transplant into the landscape. Plants were fertilized with granular controlled-release fertilizer (GF) 15N–3.9P–10K at 0, 1, 2, and 4 lb/1000 ft 2 nitrogen [no fertilizer, GF

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Luther C. Carson and Monica Ozores-Hampton

, and application timing in both plasticulture and open-bed seepage-irrigated vegetable production systems in Florida. What is controlled-release fertilizer? Controlled-release fertilizer belongs to a group of fertilizers called enhanced

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Wendy S. Klooster, Bert M. Cregg, R. Thomas Fernandez, and Pascal Nzokou

of composted pine bark (B) and Canadian peatmoss (PM) in ratios (vB:vPM) of 70%:30%, 80%:20%, or 90%:10% (Renewed Earth, Kalamazoo, MI). Thirty trees of each species were potted in each substrate mix. Fertilizer treatment Controlled-release

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Luther C. Carson, Monica Ozores-Hampton, Kelly T. Morgan, and Steven A. Sargent

(except at 109 DAT in 2012) were higher than the upper sufficiency range for LTN. Fig. 1. Leaf-tissue nitrogen (N) concentration for tomatoes grown with five controlled-release fertilizer (CRF)/soluble nitrogen fertilizer (SNF) programs in Immokalee, FL

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Tripti Vashisth and Taylor Livingston

treatments were as follows: 1) conventional fertilizer (CNV) applied at 200 lb/acre (224.17 kg·ha −1 ) nitrogen (N) in five split applications per year, and 2) controlled-release fertilizer (CRF) applied at 150 lb/acre (168.13 kg·ha −1 ) N split in three

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George H. Snyder and John L. Cisar

Field and laboratory studies were conducted to evaluate the K retention properties of several resin-coated (RC), sulfur-coated (SC), and plastic-coated (PC) K fertilizers. Substantial differences in K release were found among the controlled-release K materials, based both on the K content of `Tifgreen' bermudagrass [Cynodon dactylon (L.) Pers. × C. transvaalensis Burt-Davvy] clippings and on direct measurement of K remaining in fertilizer granules in the field over time. One SC material appeared to release K too rapidly, and one RC material appeared to release K too slowly to be useful for providing extended plant-available K to turfgrass. The other sources appeared to have release characteristics that would be favorable for turfgrass maintenance. Because differences in K release were observed among the sources, a laboratory method for assessing K release would be useful. Toward this-end, models were developed relating K retention of sources in hot water (70C) to K retention under field conditions.

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Erin Agro and Youbin Zheng

nursery leachate and runoff. Consequently, when optimal fertilizer application rates are used, crops will perform at their best and environmental impacts will be minimized ( Cabrera, 2003 ). Controlled-release fertilizers have become the principal method

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Ji-Jhong Chen, Heidi Kratsch, Jeanette Norton, Youping Sun, and Larry Rupp

) of Shepherdia ×utahensis ‘Torrey’ inoculated with soil containing infective Frankia and topdressed with 0 to 8.4 g·L −1 controlled-release fertilizer (CRF; 15N–3.9P–10K) for 8 weeks. The round markers represent means of the plants inoculated

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Timothy K. Broschat

Release rates at 21 °C were determined in sand columns for 12 commercially available soluble and controlled-release Mg fertilizers. Lutz Mg spikes, K2SO4, MgSO4, MgSO4·H2O, and MgSO4·7H2O released their Mg within 2 to 3 weeks. Within the first 6 weeks, MgO·MgSO4 released its soluble Mg fraction, but little release occurred thereafter. Dolomite and MgO released <5% of their Mg over 2 years while MagAmp released <20% of its Mg. Florikan 1N-0P-26K-4Mg types 100 and 180 exhibited typical controlled-release fertilizer characteristics, with most of their Mg release occurring during the first 15 weeks.

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Takafumi Kinoshita and Masaharu Masuda

block with three replicate plots of each treatment. Each plot was comprised of six plants, all of which were in a single container. Table 1. Fertilizer component concentrations in the substrate of controlled-release fertilizer application treatments (g