Author

Osumanu Haruna Ahmed

Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia, Bintulu Sarawak Campus, Nyabau Road, Post Box No. 396, 97008 Bintulu, Sarawak, Malaysia

48 articles in our journals

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Research ArticleOpen accessEffects of Converting Tropical Peat Swamp Forest into Oil Palm Plantation on Water QualitySeca Gandaseca, Noraini Rosli, Mohd Hanafi Idris et al.Peat swamp forest is a unique forest and wetlands ecosystem that recognized as one of the most important reservoir of biodiversity and water resources protection. Rapid development particularly for development, agriculture and plantation in peat swamp forest (PSF) area had given negative impacts to its ecosystem included degradation of its water quality. This study was conducted to determine water quality … …American Journal of Applied Sciences, Vol. 12, Issue 8 · 3 Sep 2015 · 7,629 accessesView PDF Cite

Research ArticleOpen accessEffects of Mixed Organic and Inorganic Fertilizers Application on Soil Properties and the Growth of Kenaf (Hibiscus cannabinus L.) Cultivated on Bris SoilsMohd Hadi Akbar Basri, Arifin Abdu, Shamshuddin Jusop et al.The demand for kenaf in the world increases rapidly by the years. Cultivation of the crop in Malaysia is a challenging task, especially when kenaf is grown on sandy soils with low fertility, such as the BRIS Soils (Beach Ridges Interspersed with Swales). A pot study was conducted in a glasshouse at Universiti Putra Malaysia to evaluate the potential of … …American Journal of Applied Sciences, Vol. 10, Issue 12 · 28 Oct 2013 · 8,772 accessesView PDF Cite

Research ArticleOpen accessIncorporation of Bentazone with Exserohilum rostratum for Controlling Cyperus iriaFranklin Ragai Kundat, Loo Hong Shen, Osumanu Haruna AhmedProblem statement: Various methods are used to counter the population of Cyperus iria in rice fields and among the most common method are chemical approaches. Chemical control methods are preferred by rice farmers due to their efficacy, speed, ease of storage and affordable cost. The concern of chemical herbicides is on its effects on the environment. Less attention had been … …American Journal of Agricultural and Biological Sciences, Vol. 5, Issue 2 · 5 Sep 2011 · 9,525 accessesView PDF Cite

Research ArticleOpen accessComparison of Carbon and Selected Macronutrients in Forest-Floor Litter of Rehabilitated and Secondary ForestsMelvin Ku Kin Kin, Japar Sidik Bujang, Osumanu Haruna Ahmed et al.Problem statement: Forest rehabilitation with human assistance by species selection and management shortens the time needed to rehabilitate degraded land as compared to natural succession. Empirical data on litter nutrient contents of tropical rain forests in Southeast Asia have been established, however it is limited to rehabilitated degraded lands. The objective of this study was to determine contents of carbon … …American Journal of Applied Sciences, Vol. 8, Issue 10 · 20 Aug 2011 · 7,740 accessesView PDF Cite

Research ArticleOpen accessForest Structure Assessment of a Rehabilitated ForestRoland Kueh Jui Heng, Nik Muhamad Abd. Majid, Seca Gandaseca et al.Problem Statement: Forest structure assessment provides information on forest succession, dynamics, biodiversity and health which are important but only few information is available on rehabilitated forest. The objective of this study was to assess the forest structure of selected age stands at a rehabilitated forest situated in Universiti Putra Malaysia Bintulu Sarawak Campus, Sarawak, Malaysia. Approach: Four 20×20) m plots … …American Journal of Agricultural and Biological Sciences, Vol. 6, Issue 2 · 6 Jun 2011 · 9,094 accessesView PDF Cite

Research ArticleOpen accessPores Reconfiguration in Compacted Bernam Series SoilZuraidah Yahya, Aminuddin Husin, Jamal Talib et al.Problem statement: The introduction of mechanization in oil palm (Elaeis guineensis) plantations resulted in soil compaction with increased bulk density and reduced porosity due to reconfiguration of soil pores. This could be a serious problem in the future as soil pores are important for aeration and water movement. Approach: This study was carried out to determine the effect of mechanization … …American Journal of Applied Sciences, Vol. 8, Issue 3 · 25 Mar 2011 · 8,681 accessesView PDF Cite

Research ArticleOpen accessEffect of Tropical Peat Swamp Forest Clearing on Soil Carbon StorageAhmad Shukri Mat Nuri, Seca Gandaseca, Osumanu Haruna Ahmed, Nik Muhamad Ab. MajidAbstract: Problem Statement: Forest clearing in Tropical Peat Swamp Forest (TPSF) will affect forest soil carbon storage. Thus this study is essential to determine whether the effect of clearing of forest does to the nature of soil forest concentrating on soil carbon storage. The objectives of this study were to analyze carbon storage values in logged and clear cut TPSF … …American Journal of Agricultural and Biological Sciences, Vol. 6, Issue 1 · 15 Dec 2010 · 8,939 accessesView PDF Cite

Research ArticleOpen accessComparison of Selected Soil Chemical Properties of Two Different Mangrove Forests in SarawakEmpi Rambok, Seca Gandaseca, Osumanu Haruna Ahmed, Nik Muhamad Ab. MajidProblem statement: Despite few studies of forest health and environmental conditions of mangrove forest in Sarawak, the data was not sufficient to facilitate baseline data and direct comparison of mangrove forest health obtained for different location of mangrove forest in Sarawak. On this regard, determination of contemporary mangrove soil condition was essential to addressing mangrove forest for forest health, carbon … …American Journal of Environmental Sciences, Vol. 6, Issue 5 · 31 Oct 2010 · 9,648 accessesView PDF Cite

Research ArticleOpen accessEffect of Converting Secondary Tropical Peat Swamp Forest into Oil Palm Plantation on Selected Peat Soil Physical PropertiesMohd Suffian Firdaus, Seca Gandaseca, Osumanu Haruna Ahmed, Nik Muhamad Ab. MajidProblem statement: The conversion of forest land into oil palm plantation is considered to be one of the causes of soil degradation and loss of tropical land forest in Southeast Asia. The objective of this study was to compare selected peat soil physical properties of secondary tropical peat swamp forest and oil palm plantation to determine the effect of forest … …American Journal of Environmental Sciences, Vol. 6, Issue 4 · 31 Aug 2010 · 8,742 accessesView PDF Cite

Research ArticleOpen accessEffects of Extractants on the Yields and Selected Chemical Characteristics of Humic Acids Isolated from Tropical Saprists PeatLee Jia Huey, Osumanu Haruna Ahmed, Nik Muhamad Ab. MajidProblem statement: Humic acids are beneficial to soil aggregation, binding of heavy metal, plant growth and many more. However, the isolation of Humic Acids (HA) from its origin is not only time-consuming, but the isolation is also affected by factors such as temperature and the types of extractants and their concentrations. Different concentrations of extractant are said to alter the … …American Journal of Applied Sciences, Vol. 7, Issue 7 · 31 Jul 2010 · 7,503 accessesView PDF Cite