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ORYZA- An International Journal on Rice
Year : 2007, Volume : 44, Issue : 3
First page : ( 277) Last page : ( 279)
Print ISSN : 0474-7615.

Effect of humic acid on the yield and nutrient uptake of rice

Sivakumar K., Devarajan L., Dhanasekaran K., Venkatakrishnan D., Surendran U.

Department of Soil Science and Agricultural Chemistry, Faculty of Agriculture, Annamalai University, Annamalai Nagar-608002, Tamil Nadu, India


The response of humic acid (HA) on the yield and nutrient uptake of rice (ADT-39) was study. The application of humic acid upto 20 kg ha-1 along with 100 per cent (150:50:50 NPK ha-1) recommended dose resulted in highest grain yield (4253 kg ha-1) as well as highest total uptake of nitrogen (132.0 kg ha-1), phosphorus (20.75 kg ha-1) and potassium (86.98 kg ha-1). The total N uptake significantly increased from 20.3 (control)) to 132.0 kg ha-1 to (100 per cent NPK + 20 kg HA ha-1)). The total P and K uptake also increased from 5.82 (control) to 20.75 kg ha-1 (100% NPK + 20 kg HA) and 28.97 (control) to 86.98 kg ha-1(100% NPK + 20 kg HA) respectively.



K - humate, Lignite, humic acid, rice and nutrient uptake.


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