Published in Scientific Papers. Series A. Agronomy, Vol. LX
Written by Naliana LUPAȘCU, Mihail DUMITRU, Nicoleta MĂRIN , Monica TANC
This paper presents the evolution of soil fertility as a result of long-term fertilization (35 years) with NP. The doses of nitrogen and phosphorus were: 0, 50, 100, 150, 200 kg/ha. The experimental field is located on chernozem soil. Soil samples were collected on 0-20 cm depth. Fertilization with P100N100, P100N150, P100N200 led to very significant increases of production (42%, 53% and 52%) after 35 years of fertilization of wheat crop; the variants fertilized with P100N150 have ensured the highest production (7522 kg/ha) followed by those fertilized with P100N200. Doses of 150 and 200 kg/ha nitrogen have significantly increased soil humus level from 3.06% for the control variant to 3.27%, respectively 3.25%. The application for 35 years of doses of 50-200 kg/ha phosphorus with the same doses of nitrogen did not led to statistically significant changes of the humus level, total nitrogen and mobile potassium. The content of phosphorus in the soil increased significantly once a dose of phosphorus was applied
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