牧草干燥过程中水分散失规律的研究

Investigation of Forage Moisture Loss Rules during Drying Process

旨在探讨自然干燥过程中,禾本科牧草、豆科牧草、饲料作物的水分散失规律。刈割后测定各类牧草的鲜草重(第0天重量),然后将各类牧草样品分别放置在烘箱内,75℃高温烘干24 h至恒重(烘干重);将各类牧草平铺在地面上进行晾晒、干燥,分别于刈割后第0.5、1.0、2.0、3.0、4.0、5.0、6.0天对牧草和饲料作物进行称重,并做记录;利用公式计算各类牧草在刈割后不同干燥时间的含水量。结果表明,刈割后经历不同干燥时间的禾本科牧草、豆科牧草、饲料作物含水量的变化趋势相似:随干燥时间的延长,各类牧草的含水量总体呈下降趋势;在刈割后干燥的初期阶段(第0~1天)含水量下降幅度较大,后期阶段(第2~4天及第5~6天)含水量下降幅度逐渐减小。研究结果为优质牧草干草调制技术的开发提供了有益参考。

This study aimed to investigate the moisture loss rules of gramineous forage, leguminous forage and forage crop during natural drying process. The fresh weight of different varieties of forage was immediately determined after cutting （0 day weight）; subsequently, the forage samples were dried to constant weight in oven at 75 ℃ for 24 h （dried weight ）; the forage samples were wilted in air and their weight were determined and recorded at the 0.5, 1.0^st , 2.0^nd , 3.0^th , 4.0^th , 5.0^th , 6.0^th day after cutting, respectively; the moisture content of different varieties of forage at different time after cutting was calculated by a formula. The results showed that the moisture content changing of gramineous forage, leguminous forage and forage crop during natural drying process exhibited a similar tendency： with the extension of drying time, the moisture content of different varieties of forage was generally decreased; in the initial stage after cutting （from 0 to 1^st day）, the moisture content was dramatically decreased, and in the later stage after cutting （from 2^nd to 4^th day and from 5^th to 6^th day） , the moisture content was slightly decreased. The results obtained in this study provide references for the scientific preparation of high quality hay.