Annals of Warsaw University of Life Sciences - SGGW.

42 Cz. Waszkiewicz, M. Sypułaa) b)note rate of moulddevelopment [%]80706050403020100wheatbarley0 4 8 12 16 20rate of moulddevelopment [%]80706050403020100wheatbarley0 5 10 15 20 25 30 35 40 45 50 55storage time [days]storage time [days]FIGURE 2. Changes in mould development as a function of storage time at air humidity 94% andtemperature: a) 25°C, b 20°CTABLE 1. Empirical dependencies for rate of mould development during grain storageCereals Regression equationApplication rangeCorrelationcoefficient Rstorageair humiditystorage timetemperaturewheat y = 4.1863t s + 1.9104 0.988 99% 30°C 2 – 12 daysbarley y = 3.0661 t s – 12.3 0.989 99% 30°C 5 – 14 dayswheat y = 4.7229 t s – 9.5714 0.983 99% 25°C 3 – 12 daysbarley y = 2.1111 t s – 5.1111 0.985 99% 25°C 3 – 16 dayswheat y = 5.2615 t s – 25.344 0.947 99% 20°C 3 – 20 daysbarley y = 2.1656 t s – 10.163 0.978 99% 20°C 3 – 24 dayswheat y = 5.1521 t s – 19.727 0.970 94% 25°C 3 – 17 daysbarley y = 2.167 t s – 5.7895 0.981 94% 25°C 3 – 16 dayswheat y = 2.5737 t s – 21.263 0.980 94% 20°C 6 – 36 daysbarley y = 1.3187 t s – 10.802 0.973 94% 20°C 6 – 54 dayswhere: y – ratio of mould attacked grain in the sample [%], t s – storage time [days]The obtained high correlationcoefficients for regression equationsallow for their application for practicalpurposes.The results of germination energyand capacity enabled to evaluate theusability of wheat and barley grainas sowing material during storage athumidity 99% and temperature 30°C.Considering diagrams on Figure 3 andthe obtained equations (Tab. 2) onecan find that germination energy andcapacity decrease with time of storagein the climatic chamber. This is provedby nature of equations and negativevalue of correlation coefficient. After47 days of barley grain storage thegermination energy decreased to 67%,while germination capacity to 79%. Thesame figures for wheat grain amountedto 12% and 16%, respectively. Theobtained results were strongly influencedby mould development, enhanced byprevailing storage conditions, at whichthe grain were loosing its sowing value.In the investigated period the difference