Feb 19 (Reuters) - Nutrien ( NTR ) fell short of Wall

Street expectations for fourth-quarter profit on Wednesday, as

the top potash producer struggled with lower sales in its crop

nutrients segment.

The Saskatoon, Canada-based firm posted an adjusted profit

of 31 cents per share for the three months ended December 31,

compared with the analysts' average estimate of 35 cents per

share, according to data compiled by LSEG.