淋雨对苜蓿干草品质的影响

为探讨淋雨对不同干燥期和不同草堆厚度苜蓿(Medicago sativa L.)的影响。采用完全随机设计,对苜蓿分别堆成大小为60 cm(长)×60 cm(宽)、厚度分别为10 cm和20 cm的草堆,其中一组10 cm和20 cm草堆分别模拟90,450,900和1800 mL的淋雨强度;另一组10 cm厚苜蓿当含水量晾晒至50%左右时,也进行相应的淋雨处理。研究表明:与10 cm厚度鲜样淋雨相比,10 cm草堆晾晒后淋雨极显著降低苜蓿干草中的DM和CP含量(P<0.01),提高NDF和ADF含量(P<0.01);随着淋雨强度增加极显著降低DM含量(P<0.01),提高NDF含量(P<0.01),显著提高ADF含量(P<0.05)。20 cm草堆淋雨和10 cm草堆相比,苜蓿干草中的CP和WSC含量极显著增加(P<0.01),NDF和ADF含量极显著降低(P<0.01)。淋雨处理降低了苜蓿干草的品质。

Effects of Rain on Alfalfa Hay(Medicago sativa L.)

According to random design,alfalfa hay is stacked at 60 cm × 60 cm with 10 cm or 20 cm thick,respectively.Raining effects on different humidity mow of alfalfa hay are studied.First group had simulated 90,450,900,and 1800 mL of rain while the second group was treated similarly after moisture content was air-cured at 50%.Results show that the DM(dry matter) and CP(crude protein) contents decrease significantly in air-cured mows with 10 cm thickness compared with first group for 10 cm thickness,whereas the NDF(neutral detergent fiber) and ADF(acid detergent fiber) contents increase significantly(P<0.01).These effects are enhanced with rain amounts increasing for 10 cm thickness mows.Comparing 20 cm mows with 10 cm ones,both CP and WSC(water soluble carbohydrate) contents increase significantly,whereas both NDF and ADF contents decrease significantly(P<0.01).Alfalfa hay quality declines with rain.