alexa AZOLLA - BASED ORGANIC FARMING: LOW BIOTECHNOLOGY FOR H


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Research Article

AZOLLA - BASED ORGANIC FARMING: LOW BIOTECHNOLOGY FOR HIGH RICE PRODUCTIVITY

Sudadi* and Sumarno
Soil Science Department, Faculty of Agriculture, Sebelas Maret University, Surakarta. Ir. Sutami Street 36th A Kentingan Surakarta 57126
Corresponding Author: Sudadi, E-mail: [email protected]
Received: 25 February 2014 Accepted: 27 March 2014
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Abstract

The experiment was conducted at Field Experiment Laboratory, Faculty of Agriculture, UNS Surakarta at Jumantono, Karanganyar, Central Java, to study the application of azolla-based organic farming systems to increase rice yield on Alfisol. Three treatment factors were evaluated i.e. Dosages of azolla inoculum (0; 250 and 500 gm-2), dosages of phosphate rock (equivalent to 0%, 50%, 100% of recomendated 150 kgha-1SP- 36) and dosages of plant ash-K (equivalent to 0%, 50%, 100% of recomendated 100 kgha-1KCl). As much of 12 kg fine soil (Ø 2 mm) was mixed thoroughly with these fertilizers, put into plastic pot then incubated at 5 cm height of standing water. Three rice tillers were planted each pot and azolla inoculums were spreaded at planting day. The experiment was arranged in completely randomized design with three replications. The variables observed included growth and yield of rice, soil total-N, available-P and exchangeable-K. Data analyzed by F test at 5% of level significant, followed by DMRT if any significant differences. The result showed that the treatment combination of A1P2K2 (250 gm-2 azolla inoculum, phosphate rock equal to100 kgha-1 SP-36 and organic-K equal to 75 kgha-1KCl) gave highest yield of paddy which was higher than the yield of both NPK and manure fertilizer treatment. This research shows that azolla can substitute manure as organic fertilizer in high rice yield organic farming system.

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