Using Peiza Taifeng hybrid rice as experimental object,hole tray seedlings were cultivated in a three-dimensional seedling greenhouse.During experiment,seedling age was 28 d,moisture content of bowl was 35.76%to 54.08%.Instrument used was the TA-XT2i texture analyzer.A study was conducted on plate compression,loading and unloading cycles,and creep tests of hole tray seed-ling bowl.It was found that compression deformation of plate was about 3.15 mm,and there was a significant difference in trend of pressure resistance with deformation;compression was about 4 mm,and peak value of pressure resistance increased sharply.When loading force was 1,2,3,4,and 5 N,average creep of seedling bowl was 0.005 5,0.005 5,0.005 6,0.005 7,and 0.005 9 mm.Experimental results showed that pressure resistance and deformation of bowl body exhibited nonlinear changes;during compression process of flat plate,there was no obvious yield failure point on bowl body;seedling bowl exhibited strong plastic deforma-tion ability when facing external loading and unloading.Burgers model ccould effectively characterize compressive creep characteristics of tray seedling bowl.Mechanical properties of various rice seed hole tray seedlings were analyzed.It was found that relationship between pressure resistance and deformation of different hole tray seedling bowl bodies followed a nonlinear curve.This study could provide theoretical reference for design optimization of rice transplanters.
ricepotting seedlingmechanical propertiescompressionloading and unloading cyclescreep
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