Volume 15, Issue 2 (2013)                   JAST 2013, 15(2): 409-419 | Back to browse issues page

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Arrobas M, Ângelo Rodrigues M. Agronomic Evaluation of a Fertilizer with D-CODER ‎Technology: A New Mechanism for the Slow ‎ Release of Nutrients. JAST 2013; 15 (2) :409-419
URL: http://jast.modares.ac.ir/article-23-1726-en.html
1- Mountain Research Centre (CIMO), Polytechnic Institute of Bragança, Ap 1172, 5301-855 Bragança, ‎Portugal.‎
Abstract:   (6501 Views)
D-CODER is a fertilizer with a new slow-release mechanism consisting of an organo-mineral matrix that releases the nutrients only in the presence of growing plants. Pot and field experiments were carried out to study the release pattern of N from D-CODER. The experiments included grown and bare soil plots. The fertilizer treatments were D-CODER, ammonium nitrate (ANpreplant), and the control. A fourth treatment was added to the cultivated plots, consisting of splitting the ammonium nitrate application of 25% at preplant and 75% as top-dressing (ANsplit). In the bare soil pots, 35 days after the fertilizer application (DAFA), NO3-N concentrations in the extracts of anion exchange membranes incubated in the soil for ANpreplant, D-CODER, and the control treatments were 118.5, 82.5 and 34.5 mg L-1, respectively, suggesting that part of N from D-CODER had not yet been released. In the pots cultivated with ryegrass, 209 DAFA, N recoveries for D-CODER, ANpreplant, and control treatments were 0.94, 0.86 and 0.20 g pot-1, respectively, suggesting that in the presence of the growing plants the release of N from D-CODER had not been restricted. Furthermore, soil NO3-N levels in the bare soil plots of the field experiment were significantly higher in D-CODER (38.1 and 6.8 mg kg-1 on November and March) in comparison to ANpreplant (26.3 and 5.1 mg kg-1 on Nov. and March) treatments, suggesting that N from D-CODER was better protected from leaching. In the absence of growing plants, D-CODER provided some protection of N at least until 65 DAFA. In cultivated soils, it seemed less effective, particularly if the risk of nitrate leaching persisted for a long period of time. In these situations, a split application of N was a better strategy.
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Article Type: Research Paper | Subject: Agronomy
Received: 2011/10/7 | Accepted: 2012/06/23 | Published: 2013/01/17

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