Published in Scientific Papers. Series A. Agonomy., Vol. LVI
Written by Mihai BERCA, Roxana HOROIAS, Stelica CRISTEA
The paper aims to present in detail the results of the researches performed in order to determine how weather conditions could affect winter wheat yields. To achieve this purpose we used several measurements and observations from our working points Modelu – Calarasi, Poroschia – Alexandria and also from various locations in Central and Northern Romania, data that were analyzed under different aspects. We took into account the quantity of rainfall during the flowering stage (in spring) and the temperature, expressed in oC, which exceeded the limit of 30oC in the same vegetative stage, being known that this is the maximum value supported for a normal behavior of premium wheat plants, of their production and of grain quality. Data obtained from our own experimental fields, as well as those collected from other sources, showed a negative correlation between the quantity of fallen rain and the high temperatures, but also two opposites correlations between precipitations and crops (positive links up to 350 mm and exponentially negative afterwards). Another negative correlation that we registered it is the one between the amount of degrees above 30°C recorded during flowering and the production level (which decreased, sometimes by up to 50%). The weakest results in the premium wheat production were obtained when soil drought, atmospheric drought and thermal stress correlative worked together, thing that began to happen more often in the last 10 years, especially in the Romanian Plain and in all the southern part of the country.
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