Abstract

The
effect of three different planting methods for soy and corn
was evaluated: a) every other row, b) four rows of each and
c) mono-culture and three harvesting methods of the
marketable crop: a) removal of 50% of baby corn (blooming
onset), b) removal of 50% of corn ears (milk stage) and c) no
harvest. Each treatment had three replications. The corn
variety was HS-5G (Cristiani Burkard) and that of soybean
was CIGRAS 10, a variety for grain and forage developed by
the Centro de Investigación en Granos y Semillas de la
Universidad de Costa Rica and successfully grown in the Dry
Pacific Region of Costa Rica. Harvesting for silage was
performed at the phenological stages of pre-indentation for
corn and R6 for soybean (formed seed in dough stage).
Harvesting 50 % of baby corn resulted in $164.06 of gross
income, covering 44.23 % of total expenses for planting,
growing, harvesting and ensiling in a clamp silo. However, a
decrease from 5.99 to 4.77 tDM/ha was observed,
representing a 20.3 % reduction. Ears harvest also reduced
yield by 24.4 %, but allowed for an 89.45 % recover of the
expenses, equivalent to $331.75 of gross income. Removal of
the ears is well justified, since it recovers almost all of the
costs; although there is a reduction in yield and most certainly
in digestible dry matter. If weather conditions had been more
favourable, a higher gross income could have been obtained,
with money surplus and a free crop of silage.