Dr Aminul Islam1, Dr Mosud Iqbal1, Dr MM Haque1, Ms Afsana Jahan1, Dr RW Bell2
1Soil Science Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh, 2Sustainable Land Management, Murdoch University, Perth, Australia
Soil organic matter (SOM) status of Bangladesh is generally low. It is very challenging to build up SOM under tropical and sub-tropical climate with the intensive soil disturbance caused by multiple tillage events each year. Removal of crop residues for fuel and cattle feed exacerbates this situation. Conversely organic amendments of soil can maintain a desired level of SOM. In this paper we review many long-term, medium-term and short-term studies on organic amendments to determine their effect on SOM. Long-term wetland rice cultivation favors SOM build up in soil. Rice grain production was increased with the increase of SOM level, where yield = 4.66Ln(SOC) + 5.30, R2= 0.90. Integrated plant nutrition systems (IPNS) with cow dung @ 3.0 t/ha, poultry manure (PM) or oil cake @ 2t/ha showed increasing rice yield trend over the years while the yield seems to be stagnant under inorganic fertilizer alone. Effects of organic manures were more pronounced in dry season than the wet season. Another study revealed that application of PM @ 3t/ha with IPNS based chemical fertilizers produced the highest annual rice equivalent yield of 22.4t/ha at Rangpur and 18.4t/ha at Gazipur sites. This package also improved soil properties and accumulated a significant quantity of P in soil. Mixed manure (cow dung @ 2 t/ha and ash @1 t/ha) with 50% reduced chemical fertilizer produced the highest rice and improved SOM, total N, available P and S status. Residual effects of different organic materials were also observed in different studies. Beneficial, phosphate solubilizing and nitrogen fixing bacteria were significantly higher in PM-amended plot, which indicated that organic matter improved conditions for beneficial bacteria. It can be concluded from the results of various studies that organic amendments have pronounced effect on soil fertility status especially on SOM status which is reflected on rice production. PM was superior to other materials.
Dr Aminul Islam joined at Soil Science Division, of
Bangladesh Rice Research Institute (BRRI), Gazipur on 20/08/1998 as Scientific Officer. Then promoted to Senior Scientific Officer on 01/06/2006 to Principal Scientific Officer on 16/04/2014 to Chief Scientific Officer on 15/07/2018. Dr Islam has been engaged in various research works of Soil Science Division, BRRI, Gazipur and BRRI Regional Station Habiganj. Now he is the head of BRRI regional station Rajshahi. SKILLS: Research program develop, execution, reporting of research results, operating XRF, AAS and other lab equipment. Project implementation. PCR writing. Data analyses, guide student, article review
Published articles: more than 40 in national and international journal.