Studies On Hay Making And Storage Technologies Of Alfalfa And Perennial Ryegrass In Tibet

The experiments were conducted in Shigatse Grass Station experiment place of Tibet in September 2009, It researched the effect of different drying methods on drying rate, nutritive composition and storing properties of the Alfalfa(Medicago sativa L.) and Perennial ryegrass(Lolium perenne L.), provided a scientific basis for production practice. The study includes five experiments:Experimentâ… . Initial study of different drying methods effect on the rule of Alfalfa and Perennial ryegrass water lossThere were under sunshine, pressed stems and branches, chopped material and drying in shade four treatments in experiment of Alfalfa drying rate. The results of drying rate were showed as following:pressed stems and branches>under sunshine>chopped material>drying in shade. There were field drying, drying on concrete ground, chopped material and drying in experiment of Perennial ryegrass drying rate. The results of drying rate were showed as following:drying on concrete ground>field drying>chopped material>drying in shade. The moisture of Perennial ryegrass reduced to 18% required a less time than Alfalfa.Experimentâ…¡. Effect of physical drying methods on drying rate and nutritive composition of AlfalfaAlfalfa was cut in the beginning of bloom, there were under sunshine, pressed stems and branches, chopped material and drying in shade four treatments. The results of drying rate of alfalfa were showed as following:pressed stems and branches>chopped material>under sunshine>drying in shade. Pressed stems and branches treatments had an obvious effect before the moisture content of alfalfa declined below 40%, but caused some nutritive content lost in different levels, the fibers content increased relatively, in vitro dry matter digestibility declined. Drying in shade treatments had the least of leaf loss rate, higher crude protein, lower fibers content relatively, and higher in vitro dry matter digestibility.Experimentâ…¢. Effect of chemical desiccant on drying rate and nutritive composition of AlfalfaAlfalfa was cut in the beginning of bloom, there were K2CO3 of 2%,2.5%,3% concentration, KHCO3 of 2%,2.5%,3% concentration, Na2CO3 of 1.5%,2%,2.5% concentration and NaHCO3 of 0.5%,1%,1.5% concentration nine treatments. The study researched the effect of different concentrations of four desiccant on drying rate and nutritive composition in the beginning of Alfalfa. the results of drying rate of alfalfa were showed all of four desiccant can speed up the drying rate of Alfalfa, and the sequence as following:Na2CO3>KHCO3>K2CO3>NaHCO3; the optimal concentration was:3%K2CO3, 3%KHCO3,1.5%Na2CO3,0.5%NaHCO3. The desiccant can reduce the leaf loss, the result followed by merits:Na2CO3, KHCO3, K2CO3 and NaHCO3, but not related with concentration. All treatments can increase the content of crude protein and In vitro dry matter digestibility, but hardly on the effect of other nutritive composition.Experimentâ…£. Effect of physical drying methods on drying rate and nutritive composition of Perennial ryegrassThe study researched the effect of physical drying methods on drying rate and nutritive composition of Perennial ryegrass. the results of drying rate of Perennial ryegrass were showed as following:drying on concrete ground>field drying>chopped material>drying in shade. Drying in shade treatment can reduce the loss of nutritive composition obviously in drying process of Perennial ryegrass; chopped material treatment can increase In vitro dry matter digestibility significantly. The faster drying rate resulted in a higher leaf loss rate, the slower drying rate had an opposite result.Experimentâ…¤. Effect of adding urea on nutritive composition of long-time storage Alfalfa and Perennial ryegrassThe study researched the effect of adding different urea content on 25% moisture content of long-time storage Alfalfa and Perennial ryegrass. The result showed that nutritive composition of Alfalfa reduced significantly, cellulose content increased relatively, In vitro dry matter digestibility decreased significantly. The crude protein increased correspondly with increasing urea content, but In vitro dry matter digestibility decreased. Nutritive composition changing of Perennial ryegrass was similar to the Alfalfa, but adding urea promoted In vitro dry matter digestibility of Perennial ryegrass increased.