ECONOMICAL ANALYSES OF CORN PRECEDENT CULTURES WITH COVERING NITROGEN LEVELS

ECONOMICAL ANALYSES OF CORN PRECEDENT CULTURES WITH COVERING NITROGEN LEVELS

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Brazil has been producing corn in almost all regions, although the costs of production increased azalea southern charm in the last years.New techniques which provide economy without yield loss can motivate producers, as corn is an important culture used at crop rotation system.Green manure may reduce maize production costs, maily to the incorporation of nitrogen.Data from an experiment were used for these comparisons; treatments were conducted in three precedent corn cultures (Black oat, Oilseed radish and Hairy vetch) and six nitrogen fertilizers levels (zero, 50, 100, 150, 200 and 250 kg ha-1).Corn after Black oat showed damage when N 25 kg ha-1 was used, while increasing levels increased yield up to the level of N 150 kg ha-1 where maximum yield is corn 1233 kg ha-1.

Corn after Oilseed radish showed in dose zero a yeild of corn 1500 kg ha-1, but MEE occurs fr9577 at level N 40 kg ha-1.Corn after Hairy vetch has no response to N, so MEE occurs at N level zero, where yeild is corn 2100 kg ha-1.Corn antecessor cultures that release more nitrogen could provide higher yield to the system with lower use of fertilizers.