Umi Haryati and Yoyo Soelaeman
IAARD Researchers at Indonesian Soil Research Institute. Jl. Tentara Pelajar No. 12. Cimanggu. Bogor
Abstract. One criterion of carbon efficient farming (CEF) is water use efficiency without reducing crop production. Rice farming at Experimental Station of Sukamandi was managed by farmer groups using conventional irrigation by irrigating continuously. This irrigation system was wasting water that caused low crop water use efficiency. The aims of this study were to determine efficiency of crop water use in lowland rice and to find out alternative irrigation techniques to improve water use efficiency. The experiment was conducted at 2011/2012 planting season consisting of three activities: 1) Analysis of agroecosystem, 2) Survey to farmers using semi structure interview, and 3) Field observations to calculate efficiency of water use. The results showed that the climate in the Experimental Station was categorized into C2-C3 types, with 2 wet and 6 dry months, and the average annual rainfall was 1,466 mm year-1. Water surplus occurred from May to October and deficit in December, February, and March. The soils were dominated by Ultisols with silty clay loam to clay texture. The soil had medium bulk density (BD), high total pore space and pore of available water, and slow soil permeability. The average rice yield at the site was 5-7 t ha-1 with 0.9 up to 1.5 kg/m3 crop water use efficiency level under conventional irrigation systems. Intermittent irrigation system increased crop water use efficiency of paddy by 34 up to 45%.
Keyword: Water use efficiency, paddy, CEF
Paper published at Proceeding International Workshop on Sustainable Management of Lowland for Rice Production. p. 315-336. Editors: Husen et al.. Banjarmasin, 27-28 September 2012. Indonesian Agency for Agricultural Research and Development. Ministry of Agriculture. 2013