Корреляционная связь гумуса с агрохимическими показателями светло-серой лесной поверхностно-оглеенной почвы западной лесостепи Украины

Abstract

The method of processing statistical data consists in comparing correlation coefficients between one or many pairs to establish correlation relationships between them. In the conditions of a classical stationary experiment, the correlation between humus and agrochemical indicators of light gray forest surface-gleyed soil was investigated during a long-term agricultural use in the Western Forest-Steppe of Ukraine. The experiment was established in 1965 with different doses and ratios of mineral fertilizes, farmyard manure and lime. The results showed that correlation coefficient between the content of humus and easily hydrolyzable nitrogen (N) is paired (r = 0.958-0.997). It has been proved that with prolonged application of only mineral fertilizers (N65Р68K68) a connection between humus, nitrogen, and mobile phosphorus (Р2 О5 ) is observed at a level of r = 0.989-0.775. However, in variants where along with mineral and organic fertilizers 1.0 and 1.5 doses of CaCO3 were applied according to hydrolytic acidity, even closer links are observed between humus, N and Р2 О5 , while the correlation coefficient is 0.906-0.954. At the same time, close correlation between the content of humus and exchange potassium (K2 О) in light gray forest surface-gleyed soil in the conditions of the Western Forest-Steppe of Ukraine has not been established.

Keywords

• soil
• humus
• correlation
• nitrogen
• phosphorus
• potassium
• lime
• farmyard manure
• mineral fertilizers