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

Merhaut, Donald J.; Blythe, Eugene K.; Newman, Julie; Albano, Joseph P.

doi:10.21273/hortsci.41.3.780

Cited by 45 publications

(56 citation statements)

References 29 publications

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“…(5) CRFs vary in N release and thus N leaching. N concentrations in leachates varied from 60 to 275 mg/L in container production of Vibrunum [16] and from 50 to 400 mg/L in other container ornamental plant production [68] due in part to the application of different CRFs. (6) CRF application may improve the rhizhosphere microbial community.…”

Section: Crf Application Reduces N Leaching and Runoff In Container Pmentioning

confidence: 99%

Controlled-Release Fertilizers as a Means to Reduce Nitrogen Leaching and Runoff in Container-Grown Plant Production

Chen¹,

Wei²

2018

Nitrogen in Agriculture - Updates

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Container-grown plants refer to plants produced in confined volume filled with substrates. The substrates endogenously have limited nutrients and low water-holding capacity. Plants grown in the containers must be fertilized and watered frequently varying from daily to weekly. Frequent fertilization and irrigation can result in nutrient leaching and/or runoff. Since nitrogen (N) is a key component of the majority of fertilizers, container plant production has been viewed as a source of N leaching and/or runoff. The leaching and runoff, if in large quantities on a year-round basis, could affect surface and ground water quality. Application of controlled-release fertilizers (CRFs) has been reported to have less N leaching than plants fertilized with water-soluble fertilizers (WSFs). However, there are different types of CRFs with different compositions and longevities on the market. Container plants also differ greatly in their growth and development and in N requirement. Thus, production of high-quality container plants with minimum N leaching using CRFs still remains challenging. This article is intended to discuss characteristics of container plant production and N leaching and runoff during production, and to document that CRF application can reduce N leaching and/or runoff. Certain requirements for future development of CRFs are also discussed.

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Section: Crf Application Reduces N Leaching and Runoff In Container Pmentioning

confidence: 99%

Controlled-Release Fertilizers as a Means to Reduce Nitrogen Leaching and Runoff in Container-Grown Plant Production

Chen¹,

Wei²

2018

Nitrogen in Agriculture - Updates

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“…As previously discussed in the literature Merhaut, et al, 2006), plant nutrients, other than nitrate (NO 3 -) and P, are listed under the Clean Water Act (U.S. Environmental Protection Agency, 1994) as potential pollutants of impaired water bodies. Some state agencies, such as the Regional Water Quality Control Board for Los Angeles, have already listed Mn, Cu, and Zn as potential pollutants that need to be monitored (Harris and Dasker, 1994).…”

mentioning

confidence: 99%

“…In earlier studies Merhaut et al, 2006), release and leaching characteristics of plant essential nutrients from CRFs were determined in a greenhouse production system using the cultural practices of low N fertilizer (1.17 kgÁm -3 ) rates and an acid pH, peat/pine bark/sand substrate. In the current study, the nutrient release characteristics of the same CRFs were studied using cultural practices (relatively high fertilizer rates, neutral pH, composted forest products/pine bark/sand substrate, and an outdoor climate) commonly used for suntolerant, fast-growing woody ornamentals.…”

mentioning

confidence: 99%

Effects of Prohexadione-Ca and GA4+7 on Scarf Skin and Fruit Maturity in Apple

McArtney¹,

Ferree²,

Schmid³

et al. 2006

HortSci

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Nutrient release characteristics of four different controlled-release fertilizers (Osmocote, Nutricote, Polyon, and Multicote) were monitored during an 11-month period in a simulated outdoor nursery production facility. Although no plants were used in the experiment, fertilization rates, irrigation regimes, and cultural practices simulated those typically used to produce fast-growing, high-nutrient-requiring containerized woody ornamentals. Fertilizer prill release characteristics were monitored through analyses of leachates, which were collected weekly. Concentrations of Mg, Mn, Zn, Cu, and Mo were relatively high during the first 5 to 10 weeks of the experiment, then declined and usually stabilized during the remainder of the study. However, Mn and Zn displayed erratic increases in concentrations several times throughout the study. Calcium concentrations did not increase until the fifth week, rapidly peaked to about 300 mgÁL -1 , and then decreased and leveled off to %80 to 100 mgÁL -1 during the remainder of the study. Several significant differences were observed between treatments. The Osmocote treatment had significantly greater Ca and Mg concentrations in the leachate than the other fertilizer types during the last 6 weeks of the study, whereas the Nutricote treatment often had significantly greater Fe concentrations than leachates from other treatments, especially during the last 26 to 35 weeks of the study, and significantly greater Zn concentrations than the other CRFs during the last 21 weeks of the study. Based upon U.S. Environmental Protection Agency guidelines, concentrations of Fe were often more than the allowable limit of 0.3 mgÁL -1 with all fertilizer types, but especially with Nutricote. Concentrations of Mn and Cu also exceeded federal guidelines, particularly during the first several weeks of the study.

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“…With CRFs, the Lix EC pattern was different from SS EC evolution ( The EC levels were probably associated with a high speed of nutrient release from CRFs caused by temperature (Cabrera 1997), being increased by the medium acidity, that allows the soluble salts to be leached out of the container over the first week of the cycle (Merhaut et al 2006). …”

Section: Electrical Conductivity (Ec)mentioning

confidence: 98%

Evaluation of the Leakage Contamination through the Nutrient Parameters Levels of the Substrate Solution inSyngonium podophyllum“Silver” Crop

Segura

París

Plaza

et al. 2009

Communications in Soil Science and Plant Analysis

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Substrate solution constitutes a useful tool to evaluate the nutritional status of the root zone; this work studies the possibility of using the drainage and the suction cup solution to evaluate the nutritional parameters in leaching, avoiding analysis and simplifying the diagnosis model. The trial was carried out in an INSOLE-type greenhouse (buried solar greenhouse), from 19 April to 19 September 2004 (20 weeks). There were four mineral fertilizer treatments: (SLF) standard liquid feeding, (LFSF) fertilizer (17-8-14) containing both nitrate (NO 3 2 -N) and ammonium (NH 4 + -N) and a nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP), and two coated controlled release fertilizers (CRF), the first one with Basacote Plus (16-8-12) + half concentration of SLF and the second one with Osmocote Plus (16-8-12) + half concentration of SLF. Nutrient, substrate, and leachate solutions were collected fortnightly. The parameters analyzed were pH, electrical conductivity (EC), NO 3 2 -N, and NH 4 + . There were significant differences between substrate solutions and leaching during the trial, especially when slow-release fertilizers were applied. Leaching showed more extreme pH and EC levels than suction-cup solutions, especially in the treatment with Basacote; however, NO 3 2 -N and NH 4 + -N exhibited higher values in the suction-cup solutions.

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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

Cited by 45 publications

References 29 publications

Controlled-Release Fertilizers as a Means to Reduce Nitrogen Leaching and Runoff in Container-Grown Plant Production

Controlled-Release Fertilizers as a Means to Reduce Nitrogen Leaching and Runoff in Container-Grown Plant Production

Effects of Prohexadione-Ca and GA4+7 on Scarf Skin and Fruit Maturity in Apple

Evaluation of the Leakage Contamination through the Nutrient Parameters Levels of the Substrate Solution inSyngonium podophyllum“Silver” Crop

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