Abstract:
In the structure of chemical fertilizers, the nitrogenous ones occupy the main place by their contribution in the
determination of crop increase, favorably influencing the accumulation of protein substances in maize.
The paper presents the results obtained at A.R.D.S. Secuieni in a long-lasting experience with chemical fertilizers at
maize crops.
The researchers investigated the influence of nitrogen fertilizers on corn crops at A.R.D.S. Secuieni during 2014 – 2016
and had two directions of approach:
- the study of the technical efficiency regarding the contribution of nitrogen fertilizers on the obtained yields, the
production increase and the marginal increase, in order to optimize the soil - plant system (maximizing the yield and
rationalization of the fertilizer);
- the study of the economic efficiency of nitrogen fertilizers application (values of production increase, costs, income,
profit, profit rate, unit costs) by differential application of fertilizer inputs.
