| The changes of moisture content, temperature, growth of spoilagefungi and cereal quality were studied to provide some basic data for theearly prediction of cereal deterioration. Wheat, soybean and maize werecontained.The moisture contents of cereal samples were adjusted to differentlevels by spraying method respectively, and the samples were stored inincubators at10,15,20,25,30,35respectively. Thesamples were taken periodically to determine the fungi spores and thequality, and the periods of experiment were120days for wheat and180days for soybean and maize.The results of wheat storage show that the growth of fungi increasedwith the temperature increasing, and fungi growth was most rapid at30,and decreased at35gradually. In six experimental temperatures, the optimum temperature was20based on stored grain safety andeconomic evaluation. Because of the growth of penicillium, the wheatsamples of16.9%at low temperatures still have big risk. Besides,germination and total protein of the120thday stored wheat were studied.The results show that germination decreased with increasing temperature,the amount of spoilage fungi and moisture while total protein remainedunchanged. According to the results of the study, we first proposed thecurves of the moisture content, temperature, fungal initial growth,spoilage of process and germination of stored wheat.The results of soybean storage show that along with the rise of thetemperature and moisture content, the growth of storage fungi increased.Generally, when the moisture content was equal or below12.1%, thefungi seldom affected the soybean storage; when between12.7%and14.7%, it probably did harm to storage, and the higher the temperaturewas, the more liable the soybean was to be damaged in storage; whenover16.0%, the soybean also became moldy even temperature down to10. The quality of stored fungi correlated significantly withgerminating capacity and fatty acid value, and regression equation underdifferent conditions all afford benefit for soybean's storage. According tothe results of the study, the relational graph of stored soybean's moisturecontent, temperature and fungal initial growth, and schedule showingfungal growth to storage damage in different moisture content and different temperature were obtained the optimum temperature was20,and the safe moisture content was12.7%based on stored grain safety andeconomic evaluation.The results of maize storage show that along with the rise of thetemperature and moisture content, the growth of storage fungi increased.Generally, when the moisture content was equal or below12.9%, thefungi seldom affected the maize storage; when between13.5%and15.3%,it probably did harm to storage, and the higher the temperature was, themore liable the maize was to be damaged in storage; when over15.7%,the maize also became moldy even temperature down to10. Thequality of stored fungi correlated significantly with germinating capacityand fatty acid value, and regression equation under different condition allafford benefit for maize storage. According to the results of the study, therelational graph of moisture content, temperature and fungal initialgrowth, and schedule showing fungal growth to damage in differentmoisture content and different temperature were obtained the optimumtemperature was20, and the safe moisture content was13.9%based onstored grain safety and economic evaluation.Due to complexity of fungal growth in grain storage, theexperimental result is only for reference. |
