Author(s): Endita Prima Ari Pratiwi; Fatchan Nurrochmad; Robi Arianta Sembiring; Sarra Rahmadani; Joko Sujono
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Keywords: Soil conditioning; Alternate wetting and drying; Mid-summer drainage; Water productivity; Rice yield
Abstract: Water scarcity has become a common problem in the paddy field. This condition forces farmers to save water usage. Water-saving irrigation practice can be a solution to this problem. Furthermore, many recent studies have claimed that application of organic matters to soil increased soil fertility and soil ability to keep water. This study aimed to investigate whether the application organic-amendments affect water productivity in rice production under water-saving irrigation. Two different pot experiment was carried out in two consecutive years. The first trial was conducted in 2015. Vermicompost derived from cow manure was added to soil as organic-amendments at four application rates (0%, 20%, 40%, and 60% of total soil-organic mixture weight). Rice was cultivated under Alternating Wetting and Drying (AWD) irrigation. The second trial conducted in 2016 utilized composted goat manure at an application rate of 40% and 60% (of total soil-organic mixture weight). In addition to AWD irrigation, other water-saving irrigation methods, namely Mid Season Drainage (MSD), were also performed. The conventional irrigation, i.e., continuous flooding, was used as the control treatment. The results of the 2015 experiment indicated that in pots with organic applications under AWD irrigation could significantly increase water productivity compared with those without organic applications. Mixture composition 40% : 60% (organic: soil) came out as the most optimum application rate. This result was corroborated by the result of the second experiment in 2016. Furthermore, AWD irrigation resulted in the highest water productivity, compared to MSD and conventional irrigation.
Year: 2018