Controlled release fertilizer
OwnerGeorge N. Valkanasinventor
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Abstract
A biologically controlled release coating for fertilizer comprises from 60 to 97 weight % of a waxy substance and from 40 to 3 weight % or a rosin or dimerized rosin having at least 70 weight % of resinic acids having conjugated double bonds and dimerized rosin with its derivatives thereof. Such coatings have a resin character to giver fertilizer prills which do not break on handling yet break down in response to the biological needs of the plant.
Claims8
A coating composition which provides a biologically controlled release of the coated contents to the ambient environment said composition comprising from 60 to 97 wt. % of one or more waxy components and from 3 to 40 wt. % of rosin selected from the group consisting of rosin obtained from the species Pinus Halepensis and Chinese rosin, said rosin having a conjugated double bond resinic acids in an amount of from 70 to 80 wt. %, and dimerized rosin having a softening point of at least 120.degree. C.
Dependencies are inferred from the claim text.