Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Vasile LUNGU, Tamara LEAH, Nicolai LEAH, Vera PANU, Elena SAVIN
The article presents the results of nitrogen balance evaluation in long-term experiments on leached chernozem during the 1991-2020 years at the level of agricultural plants, crop rotation and fertilizer doses. It was established that the nitrogen balance in the control variant (without fertilizers) is profoundly negative, on average constituting 81 kg/ha. Manure in dose of 60 t/ha associated with vegetable residues applied in autumn 1990 led to the reduction of the negative balance by approximate 33 kg/ha. The administration of organo-mineral fertilizers led on average for 30 years to the reduction of the negative nitrogen balance compared to the control variant by 5-57 kg/ha annually. The organic fertilizers role in maintaining an equilibrated balance was essential in the fertilization system of agricultural crops. The nitrogen fertilizers application in doses of 30-90 kg/ha did not fully compensate this deficit, only in doses of 120-150 kg/ha of nitrogen fertilizers led to an almost equilibrated and even positive nitrogen balance in some years.
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