Effect of organic and inorganic nutrient sources on soil mineral nitrogen and maize yields in central highlands of Kenya

Shisanya, C.A.; Mucheru, M.; Mugendi, Daniel N.; Kung’u, J.B.

doi:10.1016/j.still.2008.05.016

Cited by 72 publications

(61 citation statements)

References 43 publications

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“…The NPKS 25.5.5.5 fertilizer led to the highest yield probably because the N content is more available. Similar finding have been reported using a mixture of NPK 2:2:0 and cattle manure (Shisanya et al, 2009). The low amounts of available N from organic manure may be responsible for the low yields (Phukan et al, 2008).…”

Section: Yield Of Teasupporting

confidence: 77%

“…The increase in N content in the mature leaf with increase in fertilizer rate has previously been reported (Kamau et al, 2003). The low N leaf content under cattle manure is probably because it must undergo mineralization before nutrients are available for uptake (Shisanya et al, 2009). Enrichment level (1:2 and 1:4) did not vary in their effect on N content in mature leaf as was previously reported.…”

Section: Nitrogen Contentmentioning

confidence: 99%

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Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Tabu¹,

Kekana²,

Kamau³

2015

JAS

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Tea (Camelia sinensis) a major cash crop in Kenya is normally grown on highly weathered and strongly acidic soils. Non-judicial use of the recommended inorganic compound fertilizer 25:5:5:5s acidifies the soil and pollutes water masses. Integrated soil fertility management, the combined use of organic and inorganic fertilizer is recommended for higher tea yield and soil health. An experiment was carried out in the Eastern Highlands of Kenya to determine the effect of different ratios and rates of enriched cattle manure on leaf nitrogen content, yield and quality of tea. Inorganic compound fertilizer 25:5:5:5s led to the highest N level in the mature leaf. Enriching organic manures with inorganic fertilizers increased the yield but reduced the quality. Tea quality parameters Theaflavins (TF) and Thearubigins decreased with increase in fertilizer rate irrespective of fertilizer type. Caffeine content however increased with increasing rate fertilizer especially in the case of inorganic compound fertilizer 25:5:5:5. Enriching organic manures with inorganic fertilizers increased the N content in the mature leaf and crop yield but reduced the quality. The study showed the beneficial effect of enriched manures in tea production.

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Section: Yield Of Teasupporting

confidence: 77%

Section: Nitrogen Contentmentioning

confidence: 99%

Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Tabu¹,

Kekana²,

Kamau³

2015

JAS

View full text Add to dashboard Cite

show abstract

“…Due to the low average annual rainfall, the dominant vegetation is Acacia and Themeda grass, which is typical of savanna environments [31]. Meru is on the northeast slopes of Mount Kenya, where the vegetation changes dramatically to thick mixed forest due to more annual rainfall varying between 1200 and 1500 mm [32]. The mean annual temperature is ~20 °C .…”

Section: Study Area: Rivers In the Sub-watershedsmentioning

confidence: 99%

Understanding the Impact of Intensive Horticulture Land-Use Practices on Surface Water Quality in Central Kenya

Muriithi

2015

Environments

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Rapid expansion of commercial horticulture production and related activities contribute to declining surface water quality. The study sought to understand the impacts on select rivers in Laikipia and Meru, production hotspots. The specific aims were (1) to identify prevailing surface water quality by examining variations of 14 physico-chemical parameters, and (2) to categorize measured surface water quality parameters into land use types highlighting potential pollutant source processes. Water samples were collected in July and August 2013 along 14 rivers in the study area. The data were analyzed using principal component analysis (PCA) and discriminant analysis (DA). Principal components (PCs) explained 70% of the observed total variability of water quality, indicating a prevalence of heavy metal traces (cadmium, phosphate, and zinc). These were linked to the rigorous use of phosphate fertilizers and copper-based agrochemicals in intensive farming. DA provided four significant (p < 0.05) discriminant functions, with 89.5% correct assignment enabling the association of land use with observed water quality. Concentrations of dissolved solids, electro-conductivity, and salinity spiked at locations with intensive small-scale and large-scale horticulture. Understanding the impacts of intensive commercial horticulture and land use practices on water quality is critical to formulating ecologically sound watershed management and pollution abatement plans.

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“…The growth of the agricultural sector in the continent has lagged behind both economic and population growth even during the years 2001-2010, which was a period globally perceived as a 'decade of growth' (Diao et al, 2012). Particularly in Sub-Saharan Africa (SSA), productivity has not increased considerably (Shisanya et al, 2009;Pretty et al, 2011). The region has the lowest land and labour productivity rates in the world (Henk and Kofi , 2003).…”

Section: Introductionmentioning

confidence: 99%

Adoption of multiple agricultural technologies in maize production of the Central Rift Valley of Ethiopia

Ahmed¹

2015

Stud. Agr. Econ.

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Effect of organic and inorganic nutrient sources on soil mineral nitrogen and maize yields in central highlands of Kenya

Cited by 72 publications

References 43 publications

Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Effect of Varying Ratios and Rates of Enriched Cattle Manure on Leaf Nitrogen Content, Yield and Quality of Tea (Camellia sinensis)

Understanding the Impact of Intensive Horticulture Land-Use Practices on Surface Water Quality in Central Kenya

Adoption of multiple agricultural technologies in maize production of the Central Rift Valley of Ethiopia

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