Abstract
1. The method of leaf spraying of urea was applied on a grass land composed of mainly orchard gross, using one percent of water solution of urea in amount of two "kans" ("kan" equals 7.38 pounds) of urea nitrogen per "tan" ("tan" equals 0.245 acres). The application was performed in the data of 4th. to 8th. July 1954, when orchard grass was already grown to 10 inches high after first cutting. A largest increase in the yield of green crop (as second cutting) was observed in the 15th. to 20th. day after urea application, the increase being 36 percent. 2. The grass crap was found to change its water content even during short period of growing stage in summer. The grass to which urea spraying was applied showed to have always a higher water content than the control plant to which no urea was applied. 3. When calculated as air dried material, the increase of yield of grass caused by urea spraying corresponded to about 21% of control plant. 4. The grass crop to which urea was sprayed, indicated to contain a higher amount of both crude protein and pure protein than the control crop. Therefore such kind of grass, having a high amount of protein, is considered to be suited as substitutes of concentrates for dairy cattle. 5. The effect of leaf spraying of urea on the yield of crop tends to decrease as the plant growth advances, especially in such stage when the water content of whole plant became to show from 66 percent to 46 percent.
