Yield (IMAGE)

Kazan Federal University

Yield

Caption

Change in the total area of cultivated land (F) in the Russian Federation in 1970-2017. RSFSR--the Russian Soviet Federative Socialist Republic as the principal part of the former USSR until December 1991; Fav--the average area of cultivated land; ?F--relative change in Fav between 1970-1991 and 2005-2017 with p (Student's t-test); R2--the coefficient of determination of a sixth-degree polynomial trend (1); 2--the years of the political and economic reform in the USSR, "Perestroika". In the sixth-degree polynomial equation: Fi is the modeled F-value for the year yi. Note. According to the five-year program for the development of the socialist planned economy of the former USSR, the total area of cultivated land during every five years (...1971-1975, 1976-1980, 1981-1985, and 1986-1990) remained slightly changed.

Credit

Kazan Federal University

Usage Restrictions

None

License

Licensed content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.