Evaluation of the representativeness of the time series to determine the typical age at natural moisture sown with alfalfa in Northern Steppe of Ukraine

  • A. Tkachuk
  • V. Zaporozchenko
Keywords: representative period, soil moisture reserves, alfalfa, ahrohidrometeorological method, humidity cycle, modular ratio, integral curve

Abstract

Moisture in the soil has an important role in many processes occurring there in. However, not always the number observations by moisture reservesis is enough. So, with availability of the data need to determine the period which would characterize overall totality, i.e. representative period. It includes several (at least two) pair of closed cycles of humidity fluctuations. The cycles of short duration (2-4 years), which are usually superimpose on the basic cycles and incomplete cycles with only a damp or only arid phase, do not account. Cyclicality oscillation it is advisable to explore the integral (sum or difference) curves deviation of annual values of moisture reserves from of the average values over the entire observation period. The team of authors, headed by prof. Litovchenko A.F. previously determined representative period of observations for the moisture reserves from 1966 to 1987. In order to confirm or refute choice towards to moisture reserves under alfalfa crops were calculated the modular coefficients for 68-year period from 1948 to 2015. As a result, the calculations have found that to assess the type of natural moisture crops of alfalfa in northern Steppe of Ukraine should take the time series 1966-1987.

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Published
2017-01-23
Section
Agricultural sciences (agronomics, agricultural ecology, land reclamation, ecology, crops husbandry, farming)