by Momon Sodik Imanudin, Robiyanto H Susando, and Bistok Simanjuntak

The research objectives were to develop block emitter having S, Y, and Phi types suitable for high pressure condition in drip irrigations system and to test and compare the discharge for each type of emitter in the laboratory. Stages in this research were as follows: 1) designing block type of emitter; 2) developing of block structure media; 3) developing structure block; 4) installing and testing the emitter in the laboratory; and 5) Analyzing data. Results of laboratory test showed that the average discharge for each emitter Phi, S, and Y were 0.2; 0.08; and 0.1 ml/sec, respectively. The highest discharge was found on the Phi structure, while the discharge for S and Y structures were similar. The variability of discharge due to structure design in each emitter had different effect in reducing of pressure. Technical evaluations showed that type of Y structure was simpler to develop than the two other structures. Phi style was the most difficult one to be developed. The main reason was related to the complexity in making structure pattern in the block of emitter. Recommendation for applying emitter was strongly influenced by crop and soil type. Crop which needs high water and planted in the high porosity soil may use emitter with small discharge for long time application. On the other hand, the soil with heavy soil texture may use the high discharge emitter for short time application.