Study on the inhibition effect of 2propionic acid ammonium to the alfalfa mildew

The inhibition effect of different contents of 2hydroxy propionate ammonium (0.3%, 0.75% and 1.5%) to the alfalfa mildew which was rained two times continuously was studied. The results showed that 2hydroxy propionate could effectively control the growth of mildew and the decomposability of crude protein (CP), crude fat (CF), soluble sugar (SS) and amino acid (AA) of alfalfa. The growth of mildew was found in the control group and Group 1 (0.3%), besides the number of mildew reached maximum on the 6 th day and 8th day respectively and no mildew appeared in Group 2 (0.75%) and Group 3 (1.5%); with time prolonging, the content of CP had no significant change (P0.05), but the content of CF presented obvious downtrend and the decreasing extent was reduced because of mildew inhibitor, in addition, the content of CF was Group 3Group 2Group 1control on the 3rd day, 6 th day,14 th day and the difference was significant between experiment groups and the control group (P0.05); the content of SS was experiment groups control group in early experiment period and it reached the same level in later period; the content of total AA as well as 10 of 17 kinds of AA were improved after adding 2hydroxy propionate ammonium and there was remarkable difference between experiment groups and the control group (P0.05), while the content of Ser, Ala and Gly were fluctuant and the other 4 kinds of AA (Glu, Cys, Met and His) were downtrend.