OPTIMIZATION OF IRRIGATION CROPPING PATTERN (CASE STUDY ON KARANG ANYAR IRRIGATION AREA, MALANG REGENCY, INDONESIA)

Abstract

The irrigation area of Karang Anyar has the problem related to the cropping pattern and
planting area which is not in accordance with the availability of the irrigation water. Therefore, this study
intends to optimize the planting area and cropping intensity for obtaining the maximum benefit of the
farming results. The methodology started from the analysis of irrigation water requirement for the 5
alternatives cropping patterns as the input on the linear mathematical modeling by using the solver from the
Microsoft Excel. The 5 alternatives of cropping patterns are analyzed based on the discharge with the
probability of 80% (Q80), 50% (Q50), and 25% (Q25). Based on the low discharge condition (Q80) and the
normal discharge condition (Q50), the 5th alternative is the best with the cropping pattern is paddy, canesecond crop, cane-paddy, cane), the cropping intensity is 190.46% and 231.14%, and the benefit is Rp.
10,895,973,582.- and Rp. 13,539,099,637.-. However, analysis by the sufficient discharge condition (Q25)
indicates that the 3rd alternative is the best with the cropping pattern is paddy, second crop, cane-paddy,
second crop, cane-second crop, cane), the cropping intensity is 262.99%, and the benefit is Rp.
15,951,071,409.-