Dalmas O Sigunga

Dalmas O Sigunga
Maseno University · Department of Soil Science

PhD Soil Science

About

25
Publications
10,581
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215
Citations
Citations since 2017
0 Research Items
99 Citations
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201720182019202020212022202305101520
201720182019202020212022202305101520
201720182019202020212022202305101520

Publications

Publications (25)
Article
Full-text available
Low available soil phosphorus (P) is one of the factors limiting crop production in western Kenya. Availability of soil P depends on amount of apatite, addition of P fertilizers, P fixing potential of a soil, soil water content and P removal by crops. Ferralsols are one of the major soil groups in Siaya County in western Kenya with low available P....
Article
Full-text available
Low sugarcane productivity is widespread and has persisted in all zones in western Kenya over the last decade despite the release of many improved sugarcane varieties during the same period. Three sugarcane varieties, two potassium and four nitrogen rates were randomly arranged in a split-split plot design with three replications under two sugarcan...
Article
Full-text available
Soil erosion by water resulting in gully formation is a common occurrence in western Kenya. Establishment of local and sustainable countermeasures to prevent gully development/expansion in western Kenya is an urgent issue. This study presents the proposal to prevent gully development/expansion by planting Eucalyptus trees in gully prone regions. A...
Article
Full-text available
Bypass flow is a major avenue of fertilizer nitrogen (N) loss from Vertisols under environments characterized by alternating dry and wet seasons. The study quantified the effects of rainfall intensity and frequency, and fertilizer N source and rate on N content of bypass flow in a Vertisol. We carried out two experiments. Experiment I comprised of...
Article
Full-text available
Gully erosion is a common feature in western Kenya, rendering large expanses of otherwise arable land uncultivable and uninhabitable. Gully erosion in the area was classified into two types: the Awach-type and the Sondu-type. The current study aimed at providing insight into physical and chemical properties of soil that promote soil erosion and det...
Article
Full-text available
Land and soil make up the cardinal resource-base in any agricultural production system and, hence, their proper management is vital for sustainable agricultural production. A study was conducted to evaluate the availability and accessibility as well as constraints to utilization of land and soil resources for sustainable agricultural production in...
Article
Full-text available
Phosphorus and nitrogen deficiencies limit production of maize ( Zea mays L.) in many soils of western Kenya. Considerable amount of work has been done on N nutrition of maize in the region. There is, however, paucity of information on which to base fertiliser P recommendations for increased maize production considering potential differences in res...
Article
Full-text available
Bypass flow, the vertical flow of free water along the walls of macropores or preferential flow paths in the soil, can lead to movement of fertilizer nutrients beyond the reach of plants. Fertilizer type and the rate of application, as well as the amount, frequency, and intensity of rainfall, can influence the amount of fertilizer nitrogen (N) loss...
Article
Full-text available
The purpose of this study was to produce soil and climate characteristic maps from random sample point data and demonstrate their potential in land suitability evaluation for soybean ( Glycine max L. Merrill) production in Kakamega District, Kenya. Crop requirements were sourced from literature and adapted to local conditions. Soil data were genera...
Article
Full-text available
Denitrification plays important roles in nitrogen cycling and management affecting both the environment and agricultural systems. Potential denitrification has a role in comparison of denitrification magnitudes in different soils. This paper discusses the concept of potential denitrification in relation to denitrification rate and conditions under...
Article
Full-text available
Farmers want to minimize losses of nitrogen (N) by volatilization of ammonia when adding fertilizers and improve fertilizer recovery of N by plants. We aimed to quantify the losses of N through NH3 volatilization as affected by soil moisture content, type of fertilizer, and placement method in Vertisols in Kenya, and conducted three experiments for...
Article
Full-text available
Denitrification is of particular concern to agronomists with respect to fertilizer nitrogen (N) recovery by crops grown on soils of poor drainage. The objectives of this study were to determine the effects of (i) soil moisture content, (ii) available carbon, (iii) nitrogen rate, and (iv) nitrogen source on denitrification in a Vertisol (heavy clay)...
Article
Full-text available
Nitrogen is the most limiting plant nutrient in Vertisols in Kenya. Soilproperties, climatic conditions and management factors as well as fertilizercharacteristics can influence fertilizer nitrogen (N) use efficiency by crops.Vertisols, characterized by low-basic water infiltration rate, are prone towaterlogging under sub-humid and humid conditions...
Article
"Stellingen" inserted. Thesis (doctoral)--Landbouwuniversiteit te Wageningen, 1997. Includes bibliographical references (p. 179-198).
Article
Six cultivars of wheat (Triticum aestivum L.), Kenya Nyumbu, Kenya Zabadi, Alondra, Kenya Swara, Kenya Tumbili, and Kenya Fahari, were tested for their susceptibility to Al. They were grown in a glasshouse in four Kenyan soils, two of which had high Al, low pH and supported poor field crops, and two of which had higher pH, lower Al and supported he...
Article
An F1 hybrid plant obtained from a combination that Triticum spelta var. duhamelianum as female crossed with Agropyron intermedium as male was treated with colchicine solution with DMSO as described by WINKLE and KIMBER in 1976. Despite the treatment made under relatively low temperature of early spring, effectiveness of the treatment is evident, b...

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