Release Rates of Ammonium‐Nitrogen, Nitrate‐Nitrogen, Phosphorus, Potassium, Magnesium, Iron, and Manganese from Seven Controlled‐Release Fertilizers

Broschat, Timothy K.; Moore, Kimberly K.

doi:10.1080/00103620701260946

Cited by 54 publications

(41 citation statements)

References 10 publications

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“…also reported a nearly total P retention in soil and low NH + 4 and K + leaching in column experiments carried out with Galician soils after the addition of cattle slurry. In another study also using laboratory columns and different CRF, but with a lower total water volume (21 L), Broschat and Moore (2007) obtained a P leaching between 47 and 80 %, lower than that of N and K + (> 80 %). These percentages are clearly higher than those found in our study, probably because Broschat and Moore (2007) filled up their columns with washed sand, which had a much lower retention capacity for elements and compounds.…”

Section: Nutrient Balances During the Experimentsmentioning

confidence: 99%

“…In another study also using laboratory columns and different CRF, but with a lower total water volume (21 L), Broschat and Moore (2007) obtained a P leaching between 47 and 80 %, lower than that of N and K + (> 80 %). These percentages are clearly higher than those found in our study, probably because Broschat and Moore (2007) filled up their columns with washed sand, which had a much lower retention capacity for elements and compounds. Calcium and Mg 2+ leaching, similarly to Ca 2+ and Mg 2+ release, were relatively high in treatment 11-18-11 and low in treatment 8-8-16 (Table 4).…”

Section: Nutrient Balances During the Experimentsmentioning

confidence: 99%

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Nitrogen, phosphorus, potassium, calcium and magnesium release from two compressed fertilizers: column experiments

et al. 2014

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Abstract. The objective of this work was to study nutrients release from two compressed nitrogen-potassiumphosphorous (NPK) fertilizers. In the Lourizán Forest Center, tablet-type controlled-release fertilizers (CRF) were prepared by compressing various mixtures of fertilizers without covers or binders. We used soil columns (50 cm long and 7.3 cm inner diameter) that were filled with soil from the surface layer (0-20 cm) of an A horizon corresponding to a Cambic Umbrisol. Tablets of two slow-release NPK fertilizers (11-18-11 or 8-8-16) were placed into the soil (within the first 3 cm), and then water was percolated through the columns in a saturated regime for 80 days. Percolates were analyzed for N, P, K + , Ca 2+ and Mg 2+ . These elements were also determined in soil and fertilizer tablets at the end of the trials. Nutrient concentrations were high in the first leachates and reached a steady state when 1426 mm of water had been percolated, which is equivalent to approximately 1.5 years of rainfall in this geographic area. In the whole trial, both tablets lost more than 80 % of their initial N, P and K contents. However, K + , Ca 2+ and Mg 2+ were the most leached, whereas N and P were lost in leachates to a lesser extent. Nutrient release was slower from the tablet with a composition of 8-8-16 than from the 11-18-11 fertilizer. In view of that, the 8-8-16 tablet can be considered more adequate for crops with a nutrient demand sustained over time. At the end of the trial, the effects of these fertilizers on soil chemical parameters were still evident, with a significant increase of pH, available Ca 2+ , Mg 2+ , K + , P and effective cation exchange capacity (eCEC) in the fertilized columns, as well as a significant decrease in exchangeable Al 3+ , reaching values < 0.08 cmol (+) kg −1 .

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Section: Nutrient Balances During the Experimentsmentioning

confidence: 99%

Section: Nutrient Balances During the Experimentsmentioning

confidence: 99%

Nitrogen, phosphorus, potassium, calcium and magnesium release from two compressed fertilizers: column experiments

et al. 2014

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“…Considering this, acid washed sand could be used as an alternative to soil given its use in methods by Broschat and Moore (2007), Du et al (2006), and Huett and Gogel (2000). In the study by Adams et al (2013) the sand used was sourced from Ottawa Il (USA) sand, a pure silica sand recognised for its chemical inertness, where 95% of the particles are between 0.5 mm and 0.6 mm.…”

Section: Dynamic Methods-soil Sand or Solutionmentioning

confidence: 99%

A column perfusion test to assess the kinetics of nutrient release by soluble, sparingly soluble and coated granular fertilizers

Baird

Silva

Degryse

et al. 2019

J. Plant Nutr. Soil Sci.

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In recent years, innovations in fertilizer research have principally been in the design of products to supply more timely plant nutrients and mitigate detrimental losses to the environment. In the development of these fertilizers, a laboratory method to comparatively screen a large number of formulations for the rate of nutrient release is a critical first step in formulation optimization to significantly reduce time spent on pot and field trials, reducing costs considerably. Currently, given the absence of a standard laboratory method for all fertilizers, adaptions of a method for coated fertilizers from the International Organization for Standardization (2017) ISO 21263 and other column tests are being used which are often complex and/or require manual sampling which can be laborious, time consuming and costly. The method presented here evaluates the dynamic release in real time by continuously perfusing samples in columns utilizing an automated sample accumulation system for short‐term and long‐term release studies and eliminates the need for soil/sand packing of columns. Mass balance is accounted for by analysing the residue after dissolution and the amount released is expressed as a % of the total nutrient content in the product. This method is reliable, uncomplicated and cost‐effective and has been used to test uncoated soluble fertilizers, nanofertilizers, fertilizers with newly developed coating technologies and other slowly soluble fertilizers, to assess the effect of variables like coating chemistry and thickness, fertilizer composition or fertilizer particle size on release rate.

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“…Microbial biofertilizers e.g. Azotobacter chroococcum and Bacillus subtilis are commonly supplied as charcoalbased inoculants and has been applied for wheat cultivation (Mahajan et al, 2003;Ogut et al, 2005;Broschat and Moore, 2007;Kumar et al, 2010;Ramanjaneyulu et al, 2010) Though biofertilizers offer an economically attractive and ecologically sound alternative to CU, its efficacy is significantly low in relation to the crop yield than that for the chemical fertilizer. Some studies have been conducted with the application of CRFs, SRFs, and CFs for cultivation of different crops including wheat (Dahiya et al, 2004;Mubeen 2004;Ali et al, 2005;Mubeen et al, 2006;Carlier et al, 2008;Shaharoona et al, 2008;Kandil et al, 2010;Sharma and Singh, 2011;Kumar et al, 2012).…”

Section: Introductionmentioning

confidence: 98%

“…Integrated Plant Nutrient System (IPNS), Farm Yard Manure (FYM) and use of biofertilizers (CB), controlled release fertilizers (CRF), slow release fertilizers (SRF) and customized fertilizers (CF), etc. are often considered as potential alternatives to conventional urea (CU) (Mahajan et al, 2003;Ogut et al, 2005;Singh et al, , 2011aBroschat and Moore, 2007;Adesemoye et al, 2009). Microbial biofertilizers e.g.…”

Section: Introductionmentioning

confidence: 99%

Increase in Growth, Productivity and Nutritional Status of Wheat (Triticum aestivumL.) and enrichment in Soil Microbial Population Applied with Biofertilizers Entrapped with Organic Matrix

Kumar

Bauddh

Sainger

et al. 2014

Journal of Plant Nutrition

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2 To find effective alternatives to reduce the application of conventional urea (CU), a conventional biofertilizer (CB) preparation (charcoal mixed Azotobacter chroococcum and Bacillus subtilis) and the same biofertilizers entrapped in an organic matrix consisting of cow dung, rice bran, dried powder of neem leaves, and clay soil in 1:1:1:1 ratio and 25% (w/w) saresh (plant gum of Acacia sp.), named as super granules of biofertilizers (SGBF) were applied to cultivate wheat (Triticum aestivum L. cv. 'WH-711') in experimental plots. The results revealed that the efficacy of commercially available charcoal mixed biofertilizers could not prove as effective alternative to CU, whereas the same dose of biofertilizers entrapped in the organic matrix, SGBF, resulted in a significant increase in growth and productivity of wheat. It appears that SGBF prepared and applied in this study is an effective organic alternative to the urea for wheat cultivation in semi-arid subtropical agro-ecosystems.

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Release Rates of Ammonium‐Nitrogen, Nitrate‐Nitrogen, Phosphorus, Potassium, Magnesium, Iron, and Manganese from Seven Controlled‐Release Fertilizers

Cited by 54 publications

References 10 publications

Nitrogen, phosphorus, potassium, calcium and magnesium release from two compressed fertilizers: column experiments

Nitrogen, phosphorus, potassium, calcium and magnesium release from two compressed fertilizers: column experiments

A column perfusion test to assess the kinetics of nutrient release by soluble, sparingly soluble and coated granular fertilizers

Increase in Growth, Productivity and Nutritional Status of Wheat (Triticum aestivumL.) and enrichment in Soil Microbial Population Applied with Biofertilizers Entrapped with Organic Matrix

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