Research Papers/Topics in Soil Science

Effects Of Manure, Lime And Phosphorus Fertilizer On Soil Properties And Soybean (Glycine Max L.) Yields In Embu County, Kenya

Agricultural sector in Kenya, contributes with 25% on GDP, yet this sector is far to supply adequate food for an increasing population due to declining soil productivity. Soybean (Glycine max L. Merrill) is relatively new crop being introduced in smallholders farming system in the Central Highlands of Kenya as source of nutrition, income generation and soil fertility improvement. However, the crop yields are below the national average. Soil acidity and depletion of nutrients affect nega...

Lime And Manure Application To Acid Soils And Their Effects On Bio-Chemical Soil Properties And Maize Performance At Kavutiri - Embu County

Soil acidity is widespread globally, accounting for about 40% of total arable soils. In Kenya, acid soils cover about 13% of total land area and are distributed widely in the croplands of central and western Kenya regions, covering over one million hectares. The main limitation of crop productivity in Kavutiri, Embu, is soil acidity and more specifically aluminium toxicity. The objective of this study was to determine the effects of agricultural lime in combination with farmyard man...

Effect Of Cattle Manure, Mineral Fertilizer And Rhizobium Inoculation On Climbing Beans Production And Soil Properties In Burera District, Rwanda.

Agriculture is the major engine of Rwandese economy, accounting for about 40% of the GDP, 85% of employment and 80% of exports. Known as “meat for the poor”, beans constitute a predominant source of proteins in Rwandese diet since they supply 65% of national dietary proteins compared to 4% from animal sources. However, the on-farm bean productivity is about 0.8 – 1.0 tons/ hectare which is quite low compared to 5 tons/hectare that is achieved under optimal management condition...

Effects Of Different Organic Residues On Carbon Sequestration, Nutrient Availability In Soil And Maize Yields At Katumani, Machakos County, Kenya

Reduced farm productivity in smallholder farms is the principal cause of food insecurity in semi- arid parts of Kenya. This is mainly attributed to soil fertility depletion, land degradation, low soil moisture and climate change. Climate change due to increased carbon dioxideemission into the atmosphere has impacted negatively on the food productivity in Africa. The objectives of this study were: 1) to determine the effect of different organic residues on soil carbon accumulation in...

Uantifying Greenhouse Gas Emissions And Carbon Stocks In Maize-Soybean Cropping Systems In Siaya County, Kenya

ABSTRACT As climate change continues to threaten ecosystems’ functions, agriculture remains one of the major source of greenhouse gas (GHG) emissions that are responsible for global warming. The major GHG in agriculture are; carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4). Unfortunately, agriculture is also one of the most affected sectors by climate change. There is therefore need to reduce emissions by adopting agricultural practices with mitigation potential. This is by...

Effects Of Rhizobia Inoculation And Phosphorus Levels On Soybean (Glycine Max L.Merril) Yields And Selected Soil Properties In Embu County, Kenya

ABSTRACT Soybean (Glycine max L. Merril) productivity in Kenya is adversely affected by low yield, poor fertilizer use, ineffective inoculation, and soil fertility management constraints. The empirical understanding of the interaction between native soil rhizobia, inoculation, nitrogen fixation, soil fertility management practices and how these factors influence soybean productivity is insufficient. The general objective of this study was to investigate the effect of rhizobium inoculati...

Effect Of Farmyard Manure And Mineral Fertilizers On Maize Yield And Soil Properties In Huye And Bugesera Districts Of Rwanda

Agriculture in Rwanda is today characterized by low agricultural productivity due to soil fertility decline. This is mainly attributed to the mining of nutrients due to continuous cropping without adequate external addition of inputs. The adoption of Integrated Soil Fertility Management (ISFM) technologies such as the combination of organic manure and mineral fertilizers is being taken as one of solutions to this situation. A study was therefore, conducted to investigate the effects of f...

Rhizobia Inoculants Combined With Organic And Inorganic Fertilizer Amendments Effects On Nitrogen Fixation And Yields Of Beans In South Kivu, Democratic Republic Of Congo

ABSTRACTIn South Kivu Eastern of DR.Congo, most soils are highly weathered, leached and have low nutrients content resulting to low agricultural productivity. The objectives of the study was (i)to evaluate the effect of combining rhizobia inoculation and different fertilizer amendment on biomass and grain yields,(ii) to assess the nitrogen fixation efficacy of commercial rhizobia strains and (iii) to assess the effect of combining rhizobia inoculation and different fertilizer amendments on so...

Effects of Fertilizer, Lime and Organic Manure on the Nodulation and Growth of Soybean (GLYCYNE MAX(L) MERRILL) in South Eastern Nigeria

A BST RA CTGreen house experiment was conducted to study the effects of organic manure, lime and inorganic fertilizer on the nodulation and growth of Soybean (Glycine max(L) merrill) on an acid ultisol in southeastern Nigeria. The organic manure was poultry manure, the lime was commercial lime and the inorganic fertilizer was NPK(15 : 15: 15). There were 7 treatments and a control. The treatments were 100kg/ha inorganic fertilizer (NPK 15: 15: 15)(F1 );200kglhain...

Improving Sorghum Grain Yield Through Use Of Mineral Fertilizers And Farm Yard Manure For Smallholder Farmers In Makueni And Machakos Counties

ABSTRACT Reduced food productivity in smallholder farms is the principal cause of food insecurity in semi-arid parts of Kenya. This is mainly attributed to decline in soil fertility, low and unreliable rainfall, land degradation and adverse effects of climate change. The solution lies in the efficient use of nutrients and planting of drought tolerant crop varieties that can cope with the low rainfall in the ASALs. The aim of this study was to evaluate the effect of FYM, mineral fertili...

Effects Of Lime, Inorganic P And Inoculation On Soil Chemical Properties And Grain Yields Of Maize And Soybean In Western Kenya

ABSTRACTLow crop responses to fertilizer application among small holder farms are common phenomena in degraded acidic soils of western Kenya. Continuous growing of maize without commensurate soil nutrient replenishment coupled with application of soil acidifying fertilizers, especially Di-ammonium Phosphate (DAP) and Sulphate of ammonia (SA) have aggravated the soil acidity problem. An on-farm trial was sited in Shianda sub-location, East Wanga division in Mumias district, Western province, K...

Effect Of Combining Cattle Manure And Inorganic P-Ertilizer On Soil Properties And Maize Yield In Acidic Soils In Beira Corridor, Mozambique

ABSTRACT Mozambique lags behind all other Southern and Eastern African countries in maize production leading to maize imports. Soil nutrient depletion, lack of combination of organic resources with mineral resources coupled with high soil acidity has been identified as the main causes of the declining crop yields. Maize yield in smallholder systems in central Mozambique can be increased by optimum utilization of mineral fertilizers combined with cattle manure and other locally available organ...

Characterization, Classification, And Evaluation Of Soils Of Four Geomorphic Surfaces In Oguta Imo State Southeastern Nigeria

ABSTRACT This research was carried out to characterize, classify, and evaluate soils of four geomorphic units in Oguta Imo State Southeastern Nigeria. Four Pedons, each was located in each geomorphic unit. ] soil sampling was carried out in the study site, sixteen surface soil samples (0-20 cm) were collected, four from each of the geomorphic units using an auger giving a total of thirty three soil samples which was chosen to represent the main morphological variations and to present m...

Characterization And Classification Of Soils Of Dissimilar Topographic Units In Owerri Area, Imo State, Nigeria

ABSTRACT The soils of Owerri area, Southeastern Nigeria were studied with a view to characterizing and classifying them. Four locations namely Umuhu (control), Amakohia (summit), Akpodim (midslope) and Ife (footslope) were selected in the study area, to assess the impact of topography on soil properties. Three profile pits were dug in each site. 65 soil samples were collected and examined with regards to their morphological, physical and chemical properties. Test for variance was carrie...

Aggregate stability of Nkpologu sandy loam soil under different soil and crop management systems.

ABSTRACTA study was conducted in the runoff plots at the University of Nigeria Nsukka Teaching andResearch Farm, in 2010 and 2011 to monitor the changes in aggregate stability, and someselected physicochemical properties of Nkpologu sandy loam soil under different cover andsoil management systems. The management systems were bare fallow (BF), grass fallow(GF), legume (CE), groundnut (GN), sorghum (SM), and cassava (CA) cultivation. Followingthe characterization of the soil of the stu...


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