| Summary: | The experiments were conducted on a degraded medium chernozem, on the Eastern and Central side of Moldavia and itwas studied the behavior of some cultures as preliminary for the autumn wheat and the influence of different quantitiesof chemical fertilizers on these cultures and the remaining effect on the wheat. The experiments were organized in fourrepetitions and in order to appreciate in comparison the yields obtained, the energetic balance-sheet was calculated,taking into consideration the energetic consumption with the fertilizers used and the energetic value of the productionefficiency obtained during the first year at the preliminary plant and during the second year at wheat. The mediumenergetically value of the crop efficiency obtained at the preliminary culture and at wheat was situated between 6927and 3076 Mcal/ha, decreasing for the fifth preliminary ones, including wheat, silo maize, sugar beet, potato, Sudangrass and maize for grains. The fertilization of some preliminary for the autumn wheat registered the followingefficiency (average values of the balance-sheet) during the first two years after applying the fertilizers: silo maize 4264Mcal/ha, Sudan grass 1158 Mcal/ha, potato 832 Mcal/ha and maize for grains 397 Mcal/ha.
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