为深入探明含水率对玉米种子脱粒的影响机理,以铁丹Ⅰ代一号等3个品种种子玉米为研究对象,进行了不同含水率下玉米种子籽粒破损强度、果柄强度和脱粒作用力等试验.试验结果表明,含水率对玉米种子脱粒的影响主要体现在籽粒破损强度和脱粒作用力两个方面:随着含水率的下降,玉米种子籽粒破损强度显著提高,因而脱粒时不容易破碎；脱粒作用力随着含水率下降显著下降,其主要原因是籽粒之间侧向与纵向间隙变大、相互没有挤靠和支撑作用,同时果柄强度下降.试验还表明,含水率高于25％时,籽粒之间侧向与纵向没有间隙,而含水率下降到14.26％时,籽粒之间侧向与纵向间隙接近最大且变化缓慢.%In order to study the effect of moisture content on seed corn threshing mechanism, the typical three varieties of corn seed, such as Tiedan I Generation 1 etc. , were selected and a series of experiments for different moisture contents of seed damage strength, handle strength and threshing-force were completed. The test results showed that the effect of moisture content on corn threshing was mainly reflected in two aspects of seed damage strength and the threshing-force. There was a significantly increasing on damage strength of corn seed kernels as the moisture content down, and then the corn seed kernels were not easily broken during threshing. These main reasons were the lager longitudinal and lateral clearance, not extrusion or support among kernels, for the significantly dropping of the threshing-force with the moisture content decline, and the handle strength dropped at the same time too. The test results also showed that there was no longitudinal and lateral clearance among kernels when the moisture content was higher than 25% , the longitudinal and lateral clearance among kernels near the biggest changed slowly when the moisture content was below 14. 26% .
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