MODIFICATION OF CARBONATED CHERNOZEM AGROCHEMICAL INDICES UNDER INFLUENCE OF SYSTEMATIC APPLICATION OF MINERAL FERTILIZERS IN MOLDOVA

Published in Scientific Papers. Series A. Agronomy, Vol. LX
Written by Vitalie CIOCHINA, Vasile LUNGU

The paper presents the main agrochemical indexes changes: humus content, nitrate nitrogen reserves, mobile phosphorus and exchangeable potassium content in chernozem carbonated (calcareous) from south of Moldova in the period 1965 - 2015. Statistically processed data allowed to determine the dynamics of nitrogen indices with different norms: 0 - 60 - 90 - 120 - 180 kg/ha on various phosphorus funds: 1.0 - 1.5 - 2.5 - 3.5 mg/100 g of the soil. On thecontrol variant was established that humus content decreased from 3.8% to 3.4%, nitric nitrogen reserves in soil layer of 1 m under winter wheat and maize were 67 - 102 kg/ha and decreased at the harvest to 42 - 84 kg/ha. Mobile phosphorus content decreased from 1.5 to 1.2 mg/100 g soil. Potassium exchangeable content remained at a high level of 27 - 32 mg/100 g soil. The systematic application of mineral fertilizers showed the following changes of agrochemical indices: the initial humus content was 3.8% and decreased to 3.3%, nitrate nitrogen reserves were 112 - 161 kg/ha in the spring and decreased insignificantly at harvest with 7 - 19 kg/ha. The mobile phosphorus content varied in dependence of applicable fertilizes norms. The exchange able potassium content slightly increased - on average by 2 mg/100 g soil

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CIOCHINA V., LUNGU V. 2017, MODIFICATION OF CARBONATED CHERNOZEM AGROCHEMICAL INDICES UNDER INFLUENCE OF SYSTEMATIC APPLICATION OF MINERAL FERTILIZERS IN MOLDOVA. Scientific Papers. Series A. Agronomy, Vol. LX, ISSN 2285-5785, 53-56.


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