Research on Paddy Storage Quality Change and Prediction Model Based on Multi-field Coupling Theory
In order to study the change of paddy quality during storage and establish the prediction model of paddy quality change,in this paper,based on the multi-field coupling theory,the temperature and humidity change was re-corded automatically by using the self-designed temperature and humidity control system.Besides,the changes of wa-ter content,fatty acid value and catalase activity were measured during the storage period of 120 days.Finally,accord-ing to the relationship between the coupling law of temperature and humidity and the change of related indexes of paddy storage quality,the prediction model of paddy storage quality change was established.The results indicated that the temperature and humidity were coupled during the paddy storage period,and a strong and weak coupling area of tem-perature and humidity was formed in the pile.At the 60th day of storage,a"U"type high temperature and high hu-midity polymerization area appeared in the upper grain pile.After 60 days,the field effect of cooling and heating tem-perature and humidity on the cold and hot wall was weakened,and there was no strong and weak coupling area in the grain pile.The coupling effect of temperature and humidity on the water content of paddy was significant.When the paddy was stored for 120 days,the fatty acid value of paddy in the high-temperature and wet-coupled region reached a state of being close to the severe degree.However,there was no significant difference in fatty acid values between the low temperature and wet coupling region and the middle region.Temperature and humidity were the main factors that affect the catalase activity in paddy,high temperature and humidity led to the decrease of catalase activity.Under the coupled effect of temperature and humidity,the prediction models of the correlation between paddy fatty acid value(Y1)and catalase activity(Y2)with temperature and moisture were Y,=-6.758+0.320X1-0.081X2-0.026X3+0.020X4+1.501X5,Y2=119.952-0.901X,+0.313X2+0.061X3-0.044X4-4.088X5(X1:temperature of grain heap;X2:humidity of grain heap;X3:depth of grain heap;X4:storage time;X5:moisture content).
multi-field couplingpaddy storage qualitytemperature fieldhumidity fieldquality prediction model
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