Research Papers/Topics in Soil Science

Effect Of Crop Rotation Pattern On Soil Bacterial Wilt (Ralstonia Solanacearum) Population And Potato (Solanum Tuberusum L.) Yield In Njoro, Kenya

ABSTRACT Poor soil fertility and high disease incidences particularly BW are the main constraints to potato production in Njoro, Kenya. Reduction of potato yield of between 30 – 70% has been attributed to bacterial wilt alone. Against this back drop, a trial was conducted in 2012 as part of a shortterm crop rotation experiment (2 years) to investigate the effect of crop-rotation on soil bacterial wilt population and potato yield. The experiment was set up in a randomized complete block ...

Effect Of Npk Compound Fertilizer On Cassava (Manihot Esculenta Crantz) Yield In Ultisols Of Sikasso, Mali

ABSTRACT Cassava is an important food crop grown across Mali which is cultivated on Ultisols in Sikasso region situated in the southern part of the country. The lack of recommended inorganic fertilizer is among the main constraints in cassava production in the country. The N, P and K inorganic fertilization is not well practiced due to its high cost and no effective fertilizer use packages. This study aimed at determining the effect of four NPK fertilizer (15- 15-15) rates (0kg, 100kg, ...

Efficacy And Competitiveness Of Indigenous Bradyrhizobia Strains On Soybean (Glycine Max (L.) Merr.) Productivity In Malawi

ABSTRACTSoybean is an important cash crop with a growing demand in Malawi. Its ability to fix nitrogen has been exploited through the use of rhizobia inoculants to supplement indigenous rhizobia and improve soil fertility. Previous research has however shown instances whereby inoculation has had no yield response which suggests a need to fill the knowledge gap on the nitrogen fixation efficiency of indigenous rhizobia. The main objective of this study was to contribute to increased soybean yi...

Comparative Analysis Of The Physical Characteristics Of Water Stable Aggregates In Some Forest And Cultivated Soils Of Enugu State, South Eastern Nigeria.

ABSTRACTA study was conducted to evaluate the physical changes that occur in the soil due toconversion of forest to arable land. Six locations in Enugu State that were selected forthis purpose include Ugbo-Okpara (Li), Ugbo-nabo (L2), Ugwogo-Nike (L3), Iyi-Ukwu (L4), Edem (L5) and Ugwo (L6). Soil parameters determined include bulkdensity, saturated hydraulic conductivity, macro porosity, micro porosity, total porosity,organic carbon, pH, Dithionate citrate bi-carbonate (DCB) Iron oxide...

Effects Of Legume Intercrops And Mineral Nitrogen On Nutrient Uptake And Yield Of Maize (Zea Mays L.) In Malawi

ABSTRACT Nitrogen (N) is the critical plant nutrient. Low maize (Zea mays L.) yields in smallholder farms of Malawi are attributable to declining N fertility, aggravated by the ever increasing price of fertilizer. Maize, the country’s staple, has a high nitrogen demand. Little effort has been made to establish the best nitrogen rate in a maize- cowpea and maize-bean intercrop under variable soil conditions as a way of improving production, and was the objective of the current study. F...

Effects Of Commercial Chemical And Microbiological Products In Soil On Maize Growth And Yields

ABSTRACT A study was conducted under screenhouse and field conditions at Sokoine University of Agriculture to evaluate the effects of commercial chemical and microbiological products on growth and yields of SITUKA maize variety grown on an Ultisol soil. The study soil had medium organic matter, low available phosphorous (1.02 mg/kg) and very low extractable zinc (0.34 mg/kg) hence the soil was of medium fertility status and only moderately suitable for maize production. Commercial produ...

Comparison Of The Physicochemial Potential Of Boiler Ash, Poultry Droppings And Inorganic Fertilizer And Their Effects On Ultisol And Maize Performance In South Eastern Nigeria

ABSTRACTThe power boiler ashes (BA) from burnt oil- palm mill wastes at Solive Vegetable Oil MillsLtd, Nsukka has not been assessed for its crop-use potentials before, and its disposal couldpose environmental challenge in future. Several studies have shown that recycling such ashthrough agronomic production system could alleviate the risks associated with its disposaland make it a value-added input in crop production with the potentials of solving thechallenges posed by high cost of min...

Effects Of Conventional And Conservation Tillage On Selected Soil Physical Properties And Water Movement In A Vitric Andosol In Kenya

ABSTRACTSoil physical and hydraulic properties determine soil productivity. Tillage alters the structure and composition of a soil consequently influencing important soil processes such as water, air, heat flux, resistance to root penetration and nutrient availability. Soil layers have distinct physical properties which influence water movement in a profile. This study investigated long term effects of conventional, conservation and no tillage systems with or without initial subsoiling on som...

Response Of Maize To Phosphorus In Sole Maize And Maizepigeonpea Cropping System In Semi-Arid Areas Of Tanzania

ABSTRACT Estimating crop response to fertilizer application and identification of effective fertilizer materials is important for plant nutrient management and in sustaining soil fertility. Unlike other agro-ecological zones, no fertilizer recommendations have been established for the semi-arid zones in Tanzania. This could be due to the fact that semi-arid areas are regarded as marginal land for agricultural production. To address this gap, field experiments were carried out to establi...

Effect Of Mulch Type And Npk (17-17-17) Rates On Soil Nutrient Content, Growth And Yield Of Cabbage (Brassica Oleracea Var. Capitata) In Volcanic Highland Region Of Rwanda

ABSTRACTSoil fertility decline, due to soil loss by erosion, nutrient mining and sub optimal fertilizer use, is the major constraint in cabbage production in the volcanic highland region of Rwanda. The objective of the study was to assess the effect of mulch type and NPK (17-17-17) fertilizer rates on growth, nutrient uptake, yield of cabbage (Brassica oleracea var. capitata) and soil nutrient content in the volcanic highland region of Rwanda. Field experiments were conducted in two cropping ...

Response of tomato (lycoperscon esculentum m.) To coffee pulp compost, minjingu phosphate rock and coffee pulp - minjingu phosphate rock compost applied to a chromic acrisol

ABSTRACT A study was conducted in a glasshouse at Sokoine University of Agriculture Morogoro, Tanzania to investigate the effect of coffee pulp compost (CP), Minjingu phosphate rock (MPR) and coffee pulp composted with Minjingu phosphate rock (CPMPR) on phosphorus availability and response of Tomato (Lycopersicon esculentum M.) var. Carl J in 3x8 completely randomized block design experiment. The P sources were applied on a P deficient Chromic Acrisol at eight equivalent rates of 0, 40,...

Effects Of Copper Concentration In Soil On Proliferation And Survival Of Rhizobia, Nodulation And Biological Nitrogen Fixation In Beans, Cowpeas And Soybeans

ABSTRACT A study was conducted in which two strains of the fast-growing bean rhizobia- PV1 and PV2 and two others of the slow-growing bradyrhizobia for cowpeas and soybean- CP1 & GM8, respectively, were used to test their ability to: - (a) proliferate in copper contaminated liquid media, (b) survive in copper contaminated soil, (c) nodulate respective host legumes and (d) fix nitrogen under increasing copper levels both in vitro and in vivo. Known population sizes of each of the strains...

Assessment Of The Nitrogen And Phosphorus Needs And Use Efficiencies For Enhanced Maize Yields In Mbozi District Of Tanzania

ABSTRACT A study was conducted in Lumbila, Senjele, Mbimba and Ihowa villages of Mbozi district, Tanzania during 2012 – 2013 cropping season to assess the fertility status of the soils and response of maize to N and P as a strategy for enhanced and sustainable maize production. This study was triggered by the low maize yield in Tanzania due to many factors which include declining soil fertility, soil N and P being the major constraints to maize production. The search for the most appr...

Land Evaluation And Suitability Assessment For Crops Produced In Butuguri Area, Butiama District In Mara Region, Tanzania

ABSTRACT The land evaluation was conducted in the Butuguri area, Butiama District, Mara Region to assess land’s suitability for cassava, maize and sorghum production. After reviewing literature and discussing with farmers and extension officers, five criteria for growing crops were selected which are: soil physical properties, soil chemical fertility, rainfall, temperature and topography. The Analytical Hierarchical Process was used to assign relative importance weights to the cho...

Pedological Characterisation Of Soils Developed On Gneissic - Granites In Congo Nile Watershed Divide And Central Plateau Zones Of Rwanda

ABSTRACT This study examined morphology, physico-chemical characteristics, classification, potentials and limitations of soils developed on gneissic-granites of Rwanda. Three pedons (GSK-P1, GSK-P2 and TMB-P1) were studied and 19 soil samples analysed. All pedons were very deep, well drained, with loamy to clayey topsoils overlying dominantly clayey subsoils. Pedons GSK-P1 and GSK-P2 depicted eluviation-illuviation as dominant pedogenetic process. All topsoils had low bulk and particle ...


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