Welcome To Website IAS

Hot news

Independence Award

- First Rank - Second Rank - Third Rank

Labour Award

- First Rank - Second Rank -Third Rank

National Award

 - Study on food stuff for animal(2005)

 - Study on rice breeding for export and domestic consumption(2005)


- Hybrid Maize by Single Cross V2002 (2003)

- Tomato Grafting to Manage Ralstonia Disease(2005)

- Cassava variety KM140(2010)

Website links
Vietnamese calendar
Visitors summary
 Curently online :  3
 Total visitors :  1872588

Sulphur, the long-neglected nutrient in oil palm cultivation
Thursday, 2013/08/01 | 08:34:47

July 31, 2013. Penang, Malaysia – With much attention given to the importance of NPK in oil palm nutrient management, sulphur (S) has been largely ignored.


Sulphur was hardly an issue in the past, thanks to abundant S availability from existing soil organic matter, organic fertilizers, volcanic eruptions, forest burning and crop residue. Early research on oil palm nutrition in Malaysia did not reveal the need for S supply due to the widespread use of ammonium sulphate as N source. However, recent findings indicate S input has diminished from continuous S removal due to crop harvesting and leaching. In Indonesia, the popularity of S-free fertilizers (e.g. urea, rock phosphate, dolomite) in recent years, on top of the sulphate leaching, has exacerbated the condition.

Analyses of samples from Indonesian oil palm growing regions reveal a disturbing trend. Data were obtained from best management practice (BMP) projects established by the International Plant Nutrition Institute, Southeast Asia program (IPNI SEAP) together with plantation groups in Sumatra and Kalimantan between 2007 and 2011. While the BMP projects did not directly address the management of sulphur, leaf samples from the reference blocks of six sites, representative of standard estate practice in Indonesia, were assessed for S nutrient status. All sites reported a continuous decline in S status ( J. Gerendás et al., 2011. Function and nutrient status of sulphur in oil palm in Indonesia. Tropentag Bonn, Germany (http://www.tropentag.de).

From observations on-site and other crop research studies, IPNI SEAP and partners have proposed a new critical S concentration of 0.15%, substantially lower than the 0.2% published value (Fairhurst, T.H, et al., 2005, Oil Palm Series Volume 7, Pocket Guide: Nutrient Disorders and Nutrient Management). Even with the revised values, datasets from the BMP projects in 2009 show that S status is insufficient at all sites, reporting levels even lower than the proposed 0.15%.

An essential component of protein and enzymatic co-factors, S is important for the formation of oil in crops. In several oil crops, deficiency in S leads to a decrease in oil formation, affecting oil yield. Drawing from these experiences in other oil crops, the study authors anticipate that the application of S nutrient will increase oil palm yield in S-deficient plantations.

The substantial impact of sulphur on N-use efficiency and oil formation also warrants a closer look at S status. The study recommends a N/S ratio of 10/1 in the fertilizer application regime to be adequate for oil palm cultivation. The moderate cost of adding S into the fertilizer mix is likely minimal when compared to the potential increase in oil yields that lead to greater profitability. Research is now being conducted to support this hypothesis, with field trials to assess yield response to S application, in order to support sustainable S fertilization using the 4R nutrient stewardship concept.

– end –

Dr. Thomas Oberthür, IPNI Director of Southeast Asia Program
Email: toberthur@ipni.net

Back      Print      View: 429

[ Other News ]___________________________________________________
  • Reply to Sun et al.: Deposition of organic nitrogen
  • Reduction of GIGANTEA Expression Enhances Salt Tolerance in Polish Canola and Arabidopsis
  • 15 climate-smart rice varieties transferred to PhilRice for dissemination to farmers
  • Egyptian Students Organize Biotech Seminars for Sharing Knowledge
  • Capacity Building Sessions with Biosafety Regulators Held in Pakistan
  • New Zealand EPA Declares Glyphosate as Noncarcinogenic
  • Mass vaccination campaign to protect millions against yellow fever in Angola and Democratic Republic of the Congo
  • TEMINA LALANI-SHARIFF arrives as new head of IRRI Communication
  • Biotech Country Facts and Trends
  • African Countries Strive to Meet Int`l Biosafety Obligations
  • Researchers discover a special power in wheat
  • How much do countries benefit from one another’s crop diversity?
  • Gains in fight to control yellow fever outbreak: but response must continue
  • Education and its impact on global food systems
  • Undergraduates Discover Mechanism Tied to Plant Height
  • Ethiopia has staved off worst of El Niño, but possible impacts of La Niña looming large
  • Australian OGTR Calls for Comments on Application for Commercial Release of GM Cotton
  • Breakthrough in Understanding Rubisco to Help Feed the World
  • Organic nitrates and other oxidized nitrogen compounds contribute significantly to the total nitrogen depositions in the United States
  • Scientists Test Efficacy of Maize Resistant to African Maize Stem Borer in Kenya Highlands
Designed & Powered by WEBSO CO.,LTD