The effects of temperature and time on the solubility of resin-coated controlled-release fertilizers under laboratory and field conditions

Lamont, G.P.; Worrall, R.J.; O’Connell, Mary A.

doi:10.1016/0304-4238(87)90092-6

Cited by 36 publications

(32 citation statements)

References 6 publications

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“…1). Maximum air temperatures during this time period ranged from 28 to 46 °C, which are temperatures observed in other warm-temperate and subtropical growing regions (Ingram, 1981;Lamont et al, 1987). These temperatures were consistently above 21 °C, the labeled substrate temperature rating for 1-year longevity for Multicote.…”

Section: Resultssupporting

confidence: 54%

“…Controlled-release fertilizers (CRFs) are used extensively for the production of containerized woody ornamental plants, with the nursery and greenhouse industry accounting for almost 20% of all CRFs used in the U.S. (Goertz, 1993). Most of the research related to nutrient release characteristics from CRFs have been undertaken using atypical substrates such as 100% sand, under controlled laboratory conditions (Broschat, 1996;2005;Handreck, 1997;Havis and Baker, 1985a;Holcomb, 1981;Huett and Gogel, 2000;Husby et al, 2003;Lamont et al, 1987;Lunt and Oertli, 1962;Oertli and Lunt, 1962;Patel and Sharma, 1977), or by means of field studies (Gandeza et al, 1991), none of which reflects conditions experienced in container-production facilities. In addition, the duration of many experiments has been limited to 6 months, which is insufficient for measuring nutrient release from 12-monthrelease fertilizer formulations, as alluded to by Havis and Baker (1985a).…”

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confidence: 99%

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Nutrient Release from Controlled-release Fertilizers in Acid Substrate in a Greenhouse Environment: I. Leachate Electrical Conductivity, pH, and Nitrogen, Phosphorus, and Potassium Concentrations

Merhaut¹,

Blythe²,

Newman³

et al. 2006

HortSci

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Release characteristics of four types of controlled-release fertilizers (Osmocote, Nutricote, Polyon, and Multicote) were studied during a 47-week simulated plant production cycle. The 2.4-L containers containing a low-fertility, acid-based substrate were placed in an unheated greenhouse and subjected to environmental conditions often used for production of azaleas and camellias. Leachate from containers was collected weekly and monitored for pH, electrical conductivity, and concentrations of NH4+ N, NO3–N, total P and total K. Leachate concentrations of all nutrients were relatively high during the first 10 to 20 weeks of the study, and then gradually decreased during the remaining portion of the experiment. Differences were observed among fertilizer types, with Multicote often resulting in higher concentrations of N, P, and K in leachates compared to the leachates from the other fertilizer types during the first half of the study. Concentrations of NO3– and P from all fertilizer types were often above permissible levels as cited in the federal Clean Water Act.

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Section: Resultssupporting

confidence: 54%

mentioning

confidence: 99%

Nutrient Release from Controlled-release Fertilizers in Acid Substrate in a Greenhouse Environment: I. Leachate Electrical Conductivity, pH, and Nitrogen, Phosphorus, and Potassium Concentrations

Merhaut¹,

Blythe²,

Newman³

et al. 2006

HortSci

View full text Add to dashboard Cite

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“…For example, Hershey & Paul (1982) detected that between 20% and 21% of the N remained in the formula prills at the end of the growing period (Osmocote 14N-6.1P-11.6K, 3-4 months at 21ºC); the CRF was applied to a greenhouse crop growing for three months at 20ºC. In another study carried out under controlled conditions in the laboratory, two formulas of Osmocote (19N-4.8P-8.3K and 18N-2.6P-8.7K; 8-9 months at 21ºC) were subjected to incubation for 19 weeks at 45ºC and between 20% and 28% of the N remained inside the prills (Lamont et al, 1987). Other authors found 23% of the N inside the Osmocote prills (14N-6.1P-11.6K) after a three-month trial at 22ºC (Niemiera & Leda, 1993).…”

Section: Discussionmentioning

confidence: 99%

Effects of climate and fertilization strategy on nitrogen balance in an outdoor potted crop of Viburnum tinus L.

Narváez

Cáceres

Marfà

2012

Span. j. agric. res.

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Little information is currently available on how fertilization management affects leachate composition and the plant nitrogen (N) uptake of crops under Mediterranean climate. The objectives of this study were to determine the effect of different fertilization strategies and doses on the composition of the leachates and the use of N by plants, to establish a N balance for the different fertilization strategies and doses used and to establish a linear regression model to predict N concentration in leachates from an outdoor potted crop of Viburnum tinus L. 'Eve Price'. Two fertilizations strategies, i.e. continuous fertigation (NS) and incorporated controlled-release fertilizer (CRF), were applied to the crop. The treatments were two NS doses (NSA: 57.4 mg NO 3 --N L -1 and NSB: 43.4 mg NO 3 --N L -1 ) and two CRF doses (CRFC: 5 g L -1 and CRFD: 7 g L -1 ). The NO 3 --N concentration in the leachates from the CRF treatments was high in the first weeks of growing (100-300 mg L -1 ). The efficiency of use of N was greater in the NSA treatment (9.2 g g -1 ). When CRFC was applied there was an increased loss of N by leaching (48 % of the total N). The concentration of N in the leachates for both fertilization strategies was found to be correlated with the variables substrate temperature and precipitation. Therefore, these variables must be considered when determining the dose of fertilizer to be added to a crop, especially when CRF are chosen, to avoid high losses of N by leaching.Additional key words: controlled-release fertilizer; fertigation; Mediterranean climate; nitrate pollution; nitrogen efficiency; woody ornamental. ResumenEfectos del clima y de la estrategia de fertilización en el balance de nitrógeno en un cultivo al exterior en contenedor de Viburnum tinus L.Existe poca información sobre el efecto de la estrategia de fertilización en la composición de los lixiviados y la absorción de nitrógeno (N) por un cultivo en clima mediterráneo. Los objetivos de este estudio fueron determinar el efecto de diferentes estrategias de fertilización y dosis en la composición de los lixiviados y en el uso del N por las plantas, establecer un balance de N basado en la estrategia de fertilización y dosis aplicadas y establecer un modelo lineal para predecir la concentración de N en los lixiviados de un cultivo de Viburnum tinus L. `Eve Price´. Se aplicaron al cultivo fertilizantes mediante fertirrigación continua ( ). Las pérdi-das de N por lixiviación aumentaron significativamente al aplicar el tratamiento CRFC (48% del N total). La concentración de N en los lixiviados de todos los tratamientos se correlacionó con las variables temperatura del sustrato y precipitación, por lo que éstas deben ser consideradas para determinar la dosis de fertilizantes a añadir a un cultivo, especialmente cuando se usan CRF, y así evitar elevadas pérdidas de N por lixiviación.

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“…Nutrient release typically depends on time, temperature, and moisture, although fertilizer packets are not always consistent in their N release rate to the surrounding soil (Haase et al 2006). The greatest release of nutrients occurs during warm periods (Lamont et al 1987). The greatest release of nutrients occurs during warm periods (Lamont et al 1987).…”

Section: Fertilization At Plantingmentioning

confidence: 99%

Growth and nutrient dynamics of Douglas-fir seedlings raised with exponential or conventional fertilization and planted with or without fertilizer

2007

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The effects of two operational nursery fertilization regimes on the growth and nutrient dynamics of Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) seedlings after planting were compared. Seedlings were grown in a nursery with nutrients added at a constant rate (conventional fertilization) or at a rate that increased exponentially by 2%Áday -1 (exponential fertilization) and planted near Barriere and Victoria, British Columbia. At the time of planting, half of the conventionally fertilized seedlings were planted with slow-release fertilizer packets. Growth and nutrient allocation was observed for 2 years following planting. Although the exponential fertilization regime provided 25% more N in the nursery compared with the conventional fertilization regime, exponentially fertilized seedlings were smaller at the time of planting, did not differ significantly in foliar N concentration, and showed no lasting benefits in growth or nutrient allocation. Two years after planting, there were no significant differences between the conventional and exponential fertilization regimes in seedling height, root collar diameter, total dry mass, or whole-plant N concentration. Seedlings fertilized at the time of planting had greater height and dry mass on the Barriere site but not on the dry Victoria site and whole-plant N concentrations did not differ 2 years after planting.Résumé : Deux régimes opérationnels de fertilisation en pépinière pour les semis de douglas de Menzies (Pseudotsuga menziesii var. glauca (Beissn.) Franco) ont été comparés quant à leurs effets sur la dynamique de la croissance et des nutriments après la plantation. Les semis ont été cultivés en pépinière où des nutriments ont été ajoutés à un taux constant (fertilisation conventionnelle) ou à un taux qui augmentait de façon exponentielle à raison de 2 % par jour (fertilisation exponentielle) et ils ont été plantés près de Barriere et de Victoria, en Colombie-Britannique. Au moment de la plantation, la moitié des semis fertilisés de façon conventionnelle ont été plantés avec des sachets de fertilisant à libération lente. La croissance et l'allocation des nutriments ont été observées pendant deux ans après la plantation. Bien que la fertilisation exponentielle eusse fourni 25 % plus de N en pépinière comparativement à la fertilisation conventionnelle, les semis fertilisés de façon exponentielle étaient plus petits au moment de la plantation, leur concentration en N foliaire n'était pas significativement différente et aucun bénéfice durable tant du point de vue de la croissance que de l'allocation des nutriments n'a été observé. Deux ans après la plantation, il n'y avait aucune différence significative entre les deux traitements de fertilisation appliqués en pépinière du point de vue de la hauteur des semis, du diamètre au collet, de la masse anhydre totale et de la concentration de N dans l'ensemble de la plante. La taille et la masse anhydre des semis fertilisés au moment de la plantation étaient plus grandes sur le site de Barriere mais pas su...

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The effects of temperature and time on the solubility of resin-coated controlled-release fertilizers under laboratory and field conditions

Cited by 36 publications

References 6 publications

Nutrient Release from Controlled-release Fertilizers in Acid Substrate in a Greenhouse Environment: I. Leachate Electrical Conductivity, pH, and Nitrogen, Phosphorus, and Potassium Concentrations

Nutrient Release from Controlled-release Fertilizers in Acid Substrate in a Greenhouse Environment: I. Leachate Electrical Conductivity, pH, and Nitrogen, Phosphorus, and Potassium Concentrations

Effects of climate and fertilization strategy on nitrogen balance in an outdoor potted crop of Viburnum tinus L.

Growth and nutrient dynamics of Douglas-fir seedlings raised with exponential or conventional fertilization and planted with or without fertilizer

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