Global Advanced Research Journal of Agricultural Science (GARJAS) ISSN: 2315-5094
June 2014 Vol. 3(6): pp. 158-164
Copyright © 2014 Global Advanced Research Journals

 

Full Length Research Paper

Crop water productivity (CWP) with the small farm reservoir (SFR) as a supplemental irrigation for cash crop on rainfed area in Karanganyar Regency, Indonesia

Arief Noor Rachmadiyanto1*, Komariah2, Widyatmani Sih Dewi2, Masateru Senge3Dwi Priyo Ariyanto2

 

1Graduated School; 2Faculty of Agriculture (Sebelas Maret University, Surakarta, 57126 Indonesia)

3Faculty of Applied Biological Sciences, Gifu University, Japan

Corresponding Author’s Email: ariefnoor20@gmail.com

Accepted 25 May, 2014

 

Abstract

Precipitation patterns have changed due to climate change, consequently lead to frequent short drought in Karanganyar Regency, Indonesia. Small farm reservoir (SFR) is one of the water harvesting methods on farm lands, and the harvested water can be used for supplemental irrigation (SI) during dry season. The purposes of the research are to determine the efficiency and sufficiency of irrigation water based on crop evapotranspiration (ETc); and crop water productivity (CWP) of cash crop (paddy, chili, sweet corn). CWP was calculated by dividing the actual crop production (kg/ha) by the total number of irrigation water (mm). The experiment included five treatments of irrigation levels (0. 25. 50. 75. and 100% ETc) with five replications. Data analysis used Fisher Test (F-test) 5%, followed with Duncan Multiple Range Test 5%, when the F-test showed significant different. The results showed that water from SFR was estimated to be sufficient but inefficient due to water loss 1.9 higher than the total needs during two cropping seasons (14.544 m3). Supplemental irrigation did not affect the CWP, when rainfall was adequate.

Keywords: short drought, small farm reservoir, supplemental irrigation, crop evapotranspiration, crop water productivity.

 

 

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