INFLUENCE OF THE METEOROLOGICAL CONDITIONS ON THE GRAIN YIELD OF SPRING OAT, GROWN ON LEACHED CHERNOZEM IN NORTH-EAST BULGARIA

摘要

The influence of the meteorological conditions on the average spring oat yield was determined on the basis of field experiment, conducted during 1990-2004 period under the conditions of leached chernozem at IASS "Obraztsov Chiflik" -Ruse. The precipitation sum during oat vegetation period (IV-VII) is distinguished by higher variability (VC = 39%) in comparison with that in autumn-winter period (X-lll), when the variation coefficient is 21%. There is no tendency to decrease of precipitation during X-VIII period and for a sudden increase of average daily temperature sums during vegetation period (IV-VII). The precipitation and hydro-thermal coefficient (HTC) have a higher influence on the average yield during vegetation period. The average monthly temperatures in V, VI, and VII exercised negative influence (R = -0,447%).