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Articles by Osumanu Haruna Ahmed (33)

Towards Growing Bario Rice on Lowland Soils: A Preliminary Nitrogen and Potassium Fertilization Trial

Muyang Tawie Sulok Kevin, Osumanu Haruna Ahmed, Wan Yahaya Wan Asrina, Amartalingam Rajan and Mohamad Ahzam

American Journal of Agricultural and Biological Sciences 2 ( 2 ): 99 - 105 , 2007

Effect of Organic and Inorganic Fertilizers on Nitrogen and Potassium Uptake and Yield of Sweet Corn Grown on an Acid Soil

Mohd. Taufik Mohd. Yusuff, Osumanu Haruna Ahmed, Wan Asrina Wan Yahaya and Nik Muhamad Ab. Majid

American Journal of Agricultural and Biological Sciences 2 ( 2 ): 118 - 122 , 2007

Evaluation of Nitrogen and Potassium Uptake and Efficiency of Two Rice Varieties Cultivated on an Acid Soil

Shajarutulwardah Mohd Yusob, Osumanu Haruna Ahmed, Wan Asrina Wan Yahaya and Nik Muhamad Ab. Majid

American Journal of Agricultural and Biological Sciences 2 ( 3 ): 130 - 135 , 2007

Effects of Extraction and Fractionation Period on the Yield of a Tropical Peat Soil (Hemists) Humic Acids

Susilawati Kasim, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Khanif Yusop

American Journal of Agricultural and Biological Sciences 2 ( 3 ): 202 - 205 , 2007

Determination of Minimal Duration Essential for Isolation of Humic Acids From Soils in Forest Restoration Programmes

Mohd Ramzan Nur Hanisah, Osumanu Haruna Ahmed, Kasim Susilawati, Nik Muhamad Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Agricultural and Biological Sciences 3 ( 3 ): 597 - 601 , 2008

Reduction of Ammonia Loss by Mixing Urea with Liquid Humic and Fulvic Acids Isolated from Tropical Peat Soil

Susilawati Kasim, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid, Mohd Khanif Yusop and Mohamadu Boyie Jalloh

American Journal of Agricultural and Biological Sciences 4 ( 1 ): 18 - 23 , 2009

Effects of Converting Secondary Forest on Tropical Peat Soil to Oil Palm Plantation on Carbon Storage

Ch`ng Huck Ywih, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Agricultural and Biological Sciences 4 ( 2 ): 123 - 130 , 2009

Vegetation Assessment of Peat Swamp Forest Using Remote Sensing

Seca Gandaseca, John Sabang, Osumanu Haruna Ahmed and Nik Muhamad Ab. Majid

American Journal of Agricultural and Biological Sciences 4 ( 2 ): 167 - 172 , 2009

Soil Compaction and Oil Palm (Elaeis guineensis) Yield in a Clay Textured Soil

Zuraidah Yahya, Aminuddin Husin, Jamal Talib, Jamarei Othman, Osumanu Haruna Ahmed and Mohamadu Boyie Jalloh

American Journal of Agricultural and Biological Sciences 5 ( 1 ): 15 - 19 , 2010

Forest Structure Assessment of a Rehabilitated Forest

Roland Kueh Jui Heng, Nik Muhamad Abd. Majid, Seca Gandaseca, Osumanu Haruna Ahmed, Silvester Jemat and Melvin Ku Kin Kin

American Journal of Agricultural and Biological Sciences 6 ( 2 ): 256 - 260 , 2011

Simple and Rapid Method of Isolating Humic Acids from Tropical Peat Soils (Saprists)

Shamsuddin Rosliza, Osumanu Haruna Ahmed, Kasim Susilawati, Nik Muhamad Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Applied Sciences 6 ( 5 ): 820 - 823 , 2009

Simple Method of Purifying Humic Acids Isolated from Tropical Hemists (Peat Soil)

Susilawati Kasim, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Mohd Khanif Yusop

American Journal of Applied Sciences 5 ( 12 ): 1812 - 1815 , 2008

Effect of Different Ages of a Rehabilitated Forest on Selected Physico-chemical Properties

Rajeswari A.P. Murugayah, Seca Gandaseca, Osumanu Haruna Ahmed and Nik Muhamad Ab. Majid

American Journal of Applied Sciences 6 ( 6 ): 1043 - 1046 , 2009

Effect of Organic Based N Fertilizer on Dry Matter (Zea mays L.), Ammonium and Nitrate Recovery in an Acid Soil of Sarawak, Malaysia

Susilawati Kasim, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid, Mohd Khanif Yusop and Mohamadu Boyie Jalloh

American Journal of Applied Sciences 6 ( 7 ): 1289 - 1294 , 2009

Reduction of Isolation Period of Coal Humic Acids

Claudia Hui Hui Chen, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Applied Sciences 6 ( 7 ): 1327 - 1330 , 2009

Spatial-Temporal Yield Trend of Oil Palm as Influenced by Nitrogen Fertilizer Management`

Abdul Rahim Anuar, Kah Joh Goh, Tee Bee Heoh and Osumanu Haruna Ahmed

American Journal of Applied Sciences 5 ( 10 ): 1376 - 1383 , 2008

Spatial Variability of Soil Inorganic N in a Mature Oil Palm Plantation in Sabah, Malaysia

Abdul Rahim Anuar, Kah Joh Goh, Tee Bee Heoh and Osumanu Haruna Ahmed

American Journal of Applied Sciences 5 ( 9 ): 1239 - 1246 , 2008

Gamma Radiosensitivity Study on Long Bean (Vigna sesquipedalis)

Ellyfa Kon, Osumanu Haruna Ahmed, Shaharudin Saamin and Nik Muhamad Ab. Majid

American Journal of Applied Sciences 4 ( 12 ): 1090 - 1093 , 2007

Gamma Radiosensitivity Study on Chili (Capsicum annuum)

Shairul Rizdiyandi Omar, Osumanu Haruna Ahmed, Shaharudin Saamin and Nik Muhamad Ab. Majid

American Journal of Applied Sciences 5 ( 2 ): 67 - 70 , 2008

Influence of Chemical Properties on Soil Carbon Storage of a Tropical Peat Swamp Forest

Anton Eko Satrio, Seca Gandaseca, Osumanu Haruna Ahmed and Nik Muhamad Ab. Majid

American Journal of Applied Sciences 6 ( 11 ): 1969 - 1972 , 2009

Chemical Characteristics of Compost and Humic Acid from Sago Waste (Metroxylon sagu)

Auldry Chaddy Petrus, Osumanu Haruna Ahmed, Ab Majid Nik Muhamad, Hassan Mohammad Nasir, Make Jiwan and Michael Gregory Banta

American Journal of Applied Sciences 6 ( 11 ): 1880 - 1884 , 2009

Effect of Enhancing Urea-Humic Acid Mixture with Refined Acid Sulphate Soil

Mohd Taufik Mohd Yusuff, Osumanu Haruna Ahmed and Nik Muhamad Ab. Majid

American Journal of Applied Sciences 6 ( 11 ): 1892 - 1896 , 2009

Reduction of Ammonia Volatilization through Mixing Urea with Humic and Fulvic Acids isolated from Palm Oil Mill Effluent Sludge

Shamsuddin Rosliza, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Environmental Sciences 5 ( 3 ): 382 - 386 , 2009

Reduction of Ammonia Loss from Urea through Mixing with Humic Acids Isolated from Peat Soil (Saprists)

Regis Bernard, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Environmental Sciences 5 ( 3 ): 393 - 397 , 2009

Effects of Converting Secondary Forest to Oil Palm Plantation on Peat Soil Carbon and Nitrogen and other Soil Chemical Properties

Makilan Muniandy, Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Mohd Khanif Yusop

American Journal of Environmental Sciences 5 ( 3 ): 406 - 412 , 2009

Reducing Ammonia Loss from Urea by Mixing with Humic and Fulvic Acids Isolated from Coal

Ameera Abdul Reeza, Osumanu Haruna Ahmed, Nik Muhamad Nik Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Environmental Sciences 5 ( 3 ): 420 - 426 , 2009

Effect of Mixing Urea with Humic Acid and Acid Sulphate Soil on Ammonia Loss, Exchangeable Ammonium and Available Nitrate

Mohd Taufik Mohd Yusuff, Osumanu Haruna Ahmed and Nik Muhamad Ab Majid

American Journal of Environmental Sciences 5 ( 5 ): 588 - 591 , 2009

Controlling Ammonia Volatilization by Mixing Urea with Humic Acid, Fulvic Acid, Triple Superphosphate and Muriate of Potash

Shamsuddin Rosliza, Osumanu Haruna Ahmed and Nik Muhamad Ab. Majid

American Journal of Environmental Sciences 5 ( 5 ): 605 - 609 , 2009

Effect of Grain Size on Selected Physico-Chemical Properties of Clay

Osumanu Haruna Ahmed, Nik Muhamad Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Environmental Sciences 5 ( 5 ): 610 - 612 , 2009

Comparison of Selected Chemical Properties of Peat Swamp Soil Before and After Timber Harvesting

Muhamad Ismawi Salimin, Seca Gandaseca, Osumanu Haruna Ahmed and Nik Muhamad Ab. Majid

American Journal of Environmental Sciences 6 ( 2 ): 164 - 167 , 2010

Effect of Converting Secondary Tropical Peat Swamp Forest into Oil Palm Plantation on Selected Peat Soil Physical Properties

Mohd Suffian Firdaus, Seca Gandaseca, Osumanu Haruna Ahmed and Nik Muhamad Ab. Majid

American Journal of Environmental Sciences 6 ( 4 ): 402 - 405 , 2010

Use of Clinoptilolite Zeolite on Selected Soil Chemical Properties, Dry Matter Production, Nutrients Uptake and Use Efficiency of Zea mays Cultivated on an Acid Soil

Hasbullah Nur Aainaa, Osumanu Haruna Ahmed, Susilawati Kasim and Nik Muhamad Ab. Majid

International Journal of Agricultural Research 9 ( 3 ): 136 - 148 , 2014

Use of Clinoptilolite Zeolite to Reduce Christmas Island Rock Phosphate use in Zea mays Cultivation on an Acid Soil

Hasbullah Nur Aainaa, Osumanu Haruna Ahmed, Susilawati Kasim and Nik Muhamad Ab. Majid

International Journal of Soil Science 9 ( 2 ): 55 - 66 , 2014