The Optimization of Irrigated Rice Field and Improvement of Land Productivity Throught Development of Rice-Shrimp (Macrobrachium rosenbergii) Cultivation Technology on Bantul Regency

Transition of productive irrigated rice fields into other forms makes agricultural sector have to optimized using its field. Purpose of study was to determine application rice-shrimp technology on soil chemical properties, rice productivity, and economical feasibility. Treatments applied were U1 = Control/technology used by local farmers, U2 = Rice-Shrimp cultivation by shrimp population 4,000 tails, U3 = population 6,000, U4 = population 8,000, U5 = Shrimp population 4,000 + rice husk 400 kg, U6 = population 6,000 + husk 400 kg, U7 = population 8,000 + husk 400 kg. The research design was completely randomized block and replicated three times. Results showed number of shrimp populations did not significantly affect to change soil pH, Eh value, level of Fe, and Mg, but had a significant effect on C-organic, N-total, available P and K, CEC. Application of husk as 400 kg and shrimp population up to 6,000 tails had a significantly effect on the number of tillers, grains per panicle, fresh biomass weight, rice yields up to 43.26% and net profit up to 269.14% compared to control by BC and RC ratios are 1.92 and 2.93, respectively while MBCR is 3.34. It means rice-shrimp technology on Bantul classified as feasible.