These convergent boundaries also occur where a plate of ocean dives, in a process called subduction, under a landmass. As the overlying plate lifts up, it also forms mountain ranges. In addition, the diving plate melts and is often spewed out in volcanic eruptions such as those that formed some of the mountains in the Andes of South America.
Yields in Argentina are forecast to be near 120 bushels per acre this season (2013/14) a little above the trend based on the 1999 to 2013 data. Yields in Argentina are pretty erratic, with a record high over 132 bushels per acre in 2009/10 and 93 bushels per acre in 2011/12. For all of the countries and regions included in the analysis the yield variability is the highest in Argentina. The average world corn yield is about 85 bushels per acre. World corn yields are rising at between 1.3 percent and 1.4 percent per year, a faster pace than the growth in world population of 1.16 percent per year. That allows for some modest increase in per capita consumption, even with no increase in corn area.
The largest proportion of costs involve land, fertilizer and fixed + variable equipment (Fig. 1). In the cash corn division, the average cost per acre has been $238 (minimum = $215 during 1995; maximum = $260 during 1992).In the livestock corn division, the average cost per acre is $206 (minimum = $186 during 1993; maximum = $235 during 1987).verage cost per bushel has been between $1.25 and $1.95 in the cash corn division and $1.13 and $1.81 in the livestock corn division. Corn seed costs have increased 74% since the inception of the contest in 1987.