The evaluation of the influence of climatic conditions on the productivity of alfalfa in the northern steppe of Ukraine

  • A. Tkachuk
  • V. Zaporozhchenko
Keywords: meteorological factors, alfalfa, bioclimatic potential, productivity of agrocenosis, yield, moisture supply

Abstract

With the use of meteorological factors, the bioclimatic potential is calculated, which is one of the most universal and convenient complex index in the evaluation of conditions for growing crops. Calculation of the bioclimatic potential, according to the HMS Apostolovo of theDnepropetrovskregion, under the crops of alfalfa was produced in 1967–1987. The influence of climatic conditions on the productivity of alfalfa is confirmed by a close correlation with the bioclimatic potential. According to the obtained dependence, the yield of alfalfa can be evaluated and programmed.The calculated data show that the yield increase, depending on the bioclimatic potential, is different. A significant increase in yield is observed with an increase in moisture supply up to 50%. With a further increase in moisture availability, the yield increase is insignificant. This may show the economic to no purpose of additional irrigation.Decadal distribution of the bioclimatic potential showed a colossal influence of climatic factors, and especially rains. Thus, at the beginning of the growing season due to precipitation, an increase in the bioclimatic potential is observed. Closer to the middle of the vegetation this increase stops due to a decrease in the amount of precipitated rains and an increase in air temperatures.During irrigation, the bioclimatic potential coefficient is increased. According to the obtained dependence, the predicted yield increase, as a result, will be about 64%.

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Published
2017-07-07
Section
Agricultural sciences (agronomics, agricultural ecology, land reclamation, ecology, crops husbandry, farming)