Relationships between air temperature and humidity regime and growth characteristics of winter wheat
1996
Kostrej, A. | Balogh, Z. (Vysoka Skola Polnohospodarska, Nitra (Slovakia))
Relationships between air temperature (tm) and relative air temperature (rm) measured by standard way in thermometer screen and between relative humidity in the stand (rp), air temperature in the stand (tp), leaf area index (LAI), dry matter weight (W), and soil moisture (V) were obtained. The data of air temperature in the thermometer screen (tm), LAI values, total biomass (W) and soil moisture supply (V) were used to determine tp. Correlation coefficients between tm and LAI:r=0.68+/-0.05; tm and tp:r=0.86+/-0.05; tm and W:r=0.47+/-0.06. It follows from investigation of relationships of rm and rp:r=0.68+/-0.04, when rm-LAI:r=0.62+/-0.05 and at rm-W:r=0.49+/-0.06. Relationships between humidity in the stand (rp), humidity in Stevenson screen (rm) and soil moisture (V) can be expressed using the relationships:rp=95 (l-3.609.0.954 V); rm=41.914+0.452 V. An analysis of dependences achieved showed that at one and the same rm average values rp are dependent of the degree of stand development. Water content in soil can change rp by 10 to 12 %. When basic humidity is high (rm=95-96 %) rp is not dependent on LAI and W values as a consequence of lower transpiration velocity at rm close to air saturation by water vapours. With decrease of basic humidity (rm), rp lowers linearly at well developed stands and LAI is equal to 4 to 5 m2.m2. This dependence is broken at lower LAI values; rp is not dependent on LAI at low water content in soil.
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