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Research articles

ScienceAsia 41(2015): 305-314 |doi: 10.2306/scienceasia1513-1874.2015.41.305

Application of blue-green algae and mineral fertilizers to direct seeding lowland rice

Sumran˙Pimratcha, Sunun˙Butsatb, Thawan˙Kesmalac,*

ABSTRACT:     Fertilizer treatments consisting of cyanobacteria blue-green algae (BGA, Anabaena sp.) combined with nitrogen, phosphorus, and potassium were compared with untreated control rice variety Chainat˙1 in greenhouse and field experiments from December 2011 to March 2012. In the greenhouse experiment, application of BGA resulted in significantly higher phosphorus and potassium in seeds compared with the untreated control. BGA significantly increased seed weight, and the difference was 16% compared to 47% between application of NPK 16-16-8+NPK 46-0-0 (125˙kg/ha) of chemical fertilizer and untreated control. In field experiments, the differences between BGA and untreated control for nitrogen, phosphorus, and potassium in seeds and straws were not significant, and application of NPK 16-16-8+NPK 46-0-0 of chemical fertilizer was highest for nitrogen, phosphorus, and potassium in seeds and straws. Application of NPK 16-16-8+NPK 46-0-0 of chemical fertilizer gave the highest straw dry weight, total dry weight, and seed weight, but the treatments gave similar 1000-seed weight. Application of BGA clearly increased growth and yield of rice in a greenhouse, but the effects were not clear in the field. This information is useful for organic rice production.

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a Programme˙in˙Agriculture, Faculty˙of˙Agricultural˙Technology, Rajabhat˙Maha˙Sarakham˙University, Maha˙Sarakham˙44000˙Thailand
b Programme˙in˙Food˙Technology, Faculty˙of˙Agricultural˙Technology, Rajabhat˙Maha˙Sarakham˙University, Maha˙Sarakham˙44000˙Thailand
c Department˙of˙Plant˙Science˙and˙Agricultural˙Resources, Faculty˙of˙Agriculture, Khon˙Kaen˙University, Khon˙Kaen˙40002˙Thailand

* Corresponding author, E-mail: thkesmala@gmail.com

Received 4 Jun 2014, Accepted 16 Sep 2015