Oat grain yield responses to climatic conditions in the vegetation period
2005
Kolikauskas, A., Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania) | Sprainaitiene, J., Lithuanian Inst. of Agriculture, Akademija, Kedainio reg. (Lithuania)
The aim of the present study was to show a substantial impact of climatic conditions on the productivity of oat (Avena sativa L.) lines and varieties. The yield of oat lines was studied for five years (1999-2003) in field trials. All lines gave the lowest yield in 1999. The highest yield was produced in 2001. It was tried to ascertain why the yield in 1999 was the lowest and in 2001 the highest. The environmental factors of the two years were investigated, namely, precipitation and the air temperature during the growing season of oats. The correlation between the yield of oats lines, the air temperature and precipitation during separate decades of a month was assessed. No correlation between the yield of five investigated lines and the mean air temperature in the vegetation period was found. The comparison of correlation between the yield and air temperature in separate decades of a month revealed a positive linear correlation in the first decade of May (r = 0.906). Inverse correlations between the yield and the air temperature were revealed in the first, second and third decades of June. Positive correlations between the yield and precipitation were found in the first decade of July (r = 0.848 - variety 'Jaugila') and in the second decade of May (r = 0.564 - line 1407-30). A significant negative correlation between the yield and precipitation was recorded in the third decade of June (r = -0.854 - variety 'Jaugila').
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