堆放时间对氨化麦秸含氮量的影响

按照麦秸∶水∶尿素比例100∶30∶4制作的氨化饲料，用凯氏定氮法测定含氮量。Ⅰ、Ⅱ号料含氮量分别为1．1317％、1．3718％，比麦草提高161．91％、217．55％。两种料经过1～130d室内堆放，分4个阶段测定，Ⅰ号料1～40d全氮损失9．89％，占全期全氮损失15．81％的62．6％；Ⅱ号料41～60d全氮损失8．13％，20d占全期全氮损失2985％的26．35％，均属损失高峰期。结果表明，氨化料应密封保存；麦秸粉碎比铡草制作的氨化料提高含氮量21.22％。

Effect of Storage Time on Nitrogen Content of A mmoniated Wheat Straw Determining the Relationship Between Nitrogen Content of Ammoniated Wheat Straw and Stored Time Indoor

The wheat straw was treated as chopped group (size 2.0 cm, group 1) and cracked group (size 0.5 cm, group2) and ammoniated with urea solution (the ratio of wheat straw:water: urea was 100:30:4, w/w). The nitrogen content (NC) of two groups were determined with Kjeldahl's method, the results indicated that the NC of two groups were 1. 1317 % and 1 .37.18 %,161 .91 % and 217.55 % higher than control group respectively. The total nitrogen losses of two groups were 15.81 % and 29.85 % after 130 day's storage in which, the peak of nitrogen loss occurred from day 1 to day 40 for group 1 (9.89 %) and from day 41 to day 60 for group 2(8. 13 %). It was concluded that the ammoniated wheat straw should be stored airtight, and the NC of group 1 was increased by 21.22 % compared with group 2.