Study On Drying Mechanism And Additives Storage Technology Of Alfalfa

This paper was took the Medicago varia Martin.cv.Caoyuan No.2 as the study object, systematic researched on the hay making, storage and digestion utilization of alfalfa hay, aimed at searching for the hay making key technology of alfalfa in North China, and provided technical support and theoretical foundation for the production of alfalfa hay. Based on correlation analyses, this paper discussed the key technology conditions of hay making, the best way to storage and digestion test in vitro during storage. The results are as follows.By researching the moisture dissipation variation law, leaf lossed ratio, changes of chemical compositions and the effects of different treatment on alfalfa anatomical structure, the suitable means and key technical conditions for alfalfa hay making was selected in the end. Spraying chemical drying agents 2.5% potassium carbonate solution combined with steam-pressing could significantly accelerate the drying rate, even could keep nutritive value and improve the quality of alfalfa hay. Thus the loss of leave was reduced efficiently. The correlation of moisture and ratio of stem to leaf submitted index curve variety.By researching the effect of different treatment on alfalfa anatomical structure, the experimental results showed that potassium carbonate had a certain destructive influence on the cuticle of stems and leaves. Meanwhile, the results showed that not only the epidermis cuticle was destroyed, the stem cortex parenchyma cells stem space significantly increased after treated by 2.5% potassium carbonate solution, thereby greatly reducing the drying time of stem, leading to its exemption from the control of moisture movement.By measuring fungal count, content of protein and total digestion nutrition, the optimum proportion of materials obtained by the way of Orthogonal Test Design was confirmed as the following, calcium oxide addition was 1%, tangerine peel addition was 0.3% and zeolite powder addition was 2%. The nutrient composition could be preserved effectively and mould inhibition effect significantly by the compound natural antifungal agent, and the cost was significantly lower than the single-type antifungal agent which were sold on the market.The gas production, pH value, volatile fatty acids and digestive rate in vitro of different treatment alfalfa hay bale were determined through in vitro digestion experiment, the results showed that: the digestive rate could be improved effectively by adding the compound natural antifungal agent FA during storage.The results indicated that: the contents of crude protein was 18.17%, the relative feed value was 105.7%, and the digestion rate of dry matter was 66.67%, it could reach 2 grade quality standards after 360 days storing by spraying potassium carbonate solution combined with steam-pressing during the hay making, while adding the compound natural antifungal agent FA during storage(water content 28%～30%).