DIFFUSION MODEL FOR PLANT CUTICULAR PENETRATION BY SPRAY-APPLIED WEAK ORGANIC ACID BIOREGULATOR IN PRESENCE OR ABSENCE OF AMMONIUM NITRATE
| Autor: | Martin J. Bukovac, Ross D. Brazee, H. Zhu |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
chemistry.chemical_classification
Active ingredient Chemistry Ammonium nitrate Environmental engineering Penetration (firestop) Thermal diffusivity Agricultural and Biological Sciences (miscellaneous) chemistry.chemical_compound Chemical engineering Time course Diffusion (business) Diffusion cell Organic acid |
| Zdroj: | Transactions of the ASAE. 47:629-635 |
| ISSN: | 2151-0059 |
| DOI: | 10.13031/2013.16092 |
| Popis: | Current agricultural crop management practices stand in need of more effective ways to enhance penetration by spray-applied systemic materials through rate-limiting, plant cuticular surfaces. A goal of this study was to develop a plant cuticular penetration model that may aid in identifying and quantifying factors in transcuticular transport that can be effectively managed to promote penetration. A diffusion model was developed that embodied a time-dependent diffusivity and an instantaneous plane source that simulated a finite-dose spray solution containing a systemic active ingredient, with and without an additive intended to increase penetration. The time-dependent, three-layer, apparent diffusivity model was intended to simulate a donor layer on the plant surface whose driving force changed with time owing to spray-droplet drying and alteration of active-ingredient properties by solution additives. The model was validated by comparing its predictions of cuticular- penetration with laboratory data for the anionic form of 1-naphthylacetic acid (NAA) in the presence and absence of ammonium nitrate (AMN), which increases NAA uptake. Data were obtained with a finite-dose diffusion cell under defined laboratory conditions. The model satisfactorily simulated the experimental observations over a time course of 120 h, other than a tendency to overestimate penetration during the first 10 h following application. Model results also support the possibility that AMN alters the anionic form of NAA to the more readily penetrating nondissociated form. |
| Databáze: | OpenAIRE |
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