*

= layer (una capa protectora y/o adhesivo sobre los gránulos del producto)

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Note added at 13 hrs (2015-02-18 08:24:57 GMT)
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A veces se aplica a las semillas del cultivo:
"Seed coating is a thicker form of covering of seed and may contain fertiliser, growth promoters and or seed treatment ..."

As José mentioned in the discussion "coraza" is the name of a pesticide, a.k.a. diphenylamine, see refs.

•Diphenylamine
(No Scald:Coraza:2-Biphenylyl-N-pyridylacetamide:Diphenpyramide:Phenylaniline:N-Phenylbenzeneamine:N-Phenylaniline:NSC 215210)

"Water Resources Research Institute Annual Technical Report FY 2003 *

water.usgs.gov/wrri/AnnualReports/2003/FY2003_PR_Annual_Report.pdf - Proxy - Highlight

Atrazine, a s-triazine herbicide was detected (below 0.1 : g/L) in some monitoring wells, and traces of pesticides such as diphenyl amine (Coraza) and 4-chloro-3methyl phenol (4-chlor-m-cresol)


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Note added at 14 hrs (2015-02-18 09:16:23 GMT)
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"A diphenylamine adjuvant for use in applied agrochemicals"

Surfactants are a type of adjuvant, which I think includes the meaning of 'coraza'.

Adjuvant is a broad term describing any additive to a spray tank that enhances pesticide activity. Examples of adjuvants are surfactants, spreader stickers, crop oils, anti-foaming materials, buffering agents, and compatibility agents. Surfactants are adjuvants that facilitate and accentuate the emulsifying, dispersing, spreading, wetting, or other surface modifying properties of liquids.

http://extension.uga.edu/publications/detail.cfm?number=B131...

Surfactants are materials that facilitate and accentuate the emulsifying, dispersing, spreading, wetting, or other surface modifying properties of liquids.

https://www.extension.purdue.edu/extmedia/WS/WS-7.html