Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 2
Written by Tamara LEAH, Nicolai LEAH, Vasile LUNGU
The article presents the results of the phosphorus balance assessment in long-term experiments on leached chernozem during 1991-2020 yrs. at the level of agricultural plants, crop rotation and fertilization system. It was established that the phosphorus balance in the control variant (without fertilizers) was negative throughout the research period, on average constituting minus 30.5 kg/ha. The application of phosphorus fertilizers in doses of 45 kg/ha on the field with mineral application system it almost equilibrated the phosphorus balance, with a negative balance, on average over 30 years, from minus 1.3 to minus12.9 kg/ha annually. Organic-mineral fertilizers led to an increase in the productivity of field crops and a decrease in the negative phosphorus balance in the crop rotation, on average by 19.7-36.1 kg/ha compared to the unfertilized variant. At the growing of winter wheat, corn for grains, sunflower and leguminous crops on leached chernozem, the application of phosphorus fertilizers at a dose of 45 kg/ha compensated the phosphorus deficit, the balance becoming equilibrated or positive.
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