Total-all    ----------------Plant Food---------------
Year    Fertilizer      Nitrogen        P2O5        Potash
         -tons-          -tons-        -tons-       -tons-
1950        772             NA           248            3
1960        620             NA            92            9
1970        879            101           135          137
1980         37              7            NA           NA 
1985        454             55            59           60
1990        267             31            29           29
1991        283             39            37           39
1992        126             15            14           16 
1993         20              2             1            1
1994         77             10             7            5
1995        158             20            20            9
1996        198             17             7           10
1997        224             25            15           14
1998        196             16             7           10  

NA-Not available.

Source: University of Missouri Annual Fertilizer Tonnage Report