** Shares of Nufarm NUF.AX rise as much as 3.5% to A$1.905, logging their best day since March 18

** The crop protection firm says it has expanded a strategic partnership with oil giant BP BP.L

** Nufarm says the updated agreement provides long-term framework that supports growth of Carinata to be sued as non-food intermediate crop biofuel feedstock

** Carinata is non-food cover crop that can be used to produce low-carbon biofuel feedstock

** Stock down nearly 20% this year, including the day's move

(Reporting by Rajasik Mukherjee in Bengaluru)

((Rajasik.Mukherjee@thomsonreuters.com))