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You searched for: Subject term Kenya Remove constraint Subject term: Kenya Subject term fertilizer rates Remove constraint Subject term: fertilizer rates
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1. Are Kenyan farmers under-utilizing fertilizer? Implications for input intensification strategies and research

Author:
Megan Sheahan; Roy Black; T.S. Jayne
Source:
Food policy 2013 v.41 pp. 39-52
ISSN:
0306-9192
Subject:
corn; farmers; fertilizer rates; mineral fertilizers; nitrogen; profitability; research planning; surveys; Kenya
Abstract:
... It is widely perceived that African farmers are under-utilizing inorganic fertilizer. However, very little long-term evidence from farmers’ fields, accounting for variations in agro-ecological conditions, has been assembled to back this claim or determine the conditions under which it is true. Using five waves of nationwide household survey data from Kenya covering 13years, we estimate the relativ ...
DOI:
10.1016/j.foodpol.2013.04.008

2. Carbon and nitrogen dynamics in a phosphorus-deficient soil amended with organic residues and fertilizers in western Kenya

Author:
Nziguheba, G.; Merckx, R.; Palm, C.A.
Source:
Biology and fertility of soils 2005 v.41 no.4 pp. 240-248
ISSN:
0178-2762
Subject:
soil nutrient dynamics; triple superphosphate; plant residues; fertilizer rates; soil amendments; mineralization; nitrogen content; soil microorganisms; shrubs; leaves; dry matter accumulation; soil organic matter; soil pH; microbial biomass; Kenya
DOI:
10.1007/s00374-005-0832-0

3. Chickpea-Wheat Rotation for Higher Production in a Humid Tropical Region

Author:
B. O. Danga; J. P. Ouma; I. I. C. Wakindiki; A. Bar-Tal
Source:
Agronomy journal 2010 v.102 no.2 pp. 363-371
ISSN:
0002-1962
Subject:
soil water storage; profitability; nitrogen content; tillage; fertilizer rates; wheat; green manures; fallow; chickpeas; nutrient uptake; Triticum aestivum; grain yield; soil fertility; field experimentation; Cicer arietinum; crop rotation; nitrogen fertilizers; Kenya
Abstract:
... Stagnation in grain production in the developing world has contributed to the current worldwide food crisis. The principle objective of this study was to evaluate the possibility of improving grain production in the tropical humid region by chickpea (Cicer arietinum L.) in rotation with wheat (Triticum aestivum L). A 3-yr field experiment in Kenya included four short-rain-season (SRS) management p ...
DOI:
10.2134/agronj2009.0145

4. Closing the cassava yield gap: An analysis from smallholder farms in East Africa

Author:
Fermont, A.M.; van Asten, P.J.A.; Tittonell, P.; van Wijk, M.T.; Giller, K.E.
Source:
Field crops research 2009 v.112 no.1 pp. 24-36
ISSN:
0378-4290
Subject:
small-scale farming; farm management; drought; NPK fertilizers; farm surveys; weed control; on-farm research; water stress; genotype; yields; harvest date; cultivars; soil quality; plant establishment; crop management; households; cassava; fertilizer rates; regression analysis; socioeconomic status; farm labor; Manihot esculenta; Uganda; Kenya
Abstract:
... Cassava yields in Africa are small and it remains unclear which factors most limit yields. Using a series of farm surveys and on-farm and on-station trials in Uganda and western Kenya, we evaluated the importance of abiotic, biotic and associated crop management constraints for cassava production in a range of socio-economic settings as found in smallholder farms in the region. Average yields unde ...
DOI:
10.1016/j.fcr.2009.01.009

5. Effect of fish pond effluents irrigation on French beans in central Kenya

Author:
Meso, M.B.; Wood, C.W.; Karanja, N.K.; Veverica, K.L.; Woomer, P.L.; Kinyali, S.M.
Source:
Communications in soil science and plant analysis 2004 v.35 no.7-8 pp. 1021-1031
ISSN:
0010-3624
Subject:
Phaseolus vulgaris; chemical constituents of plants; crop yield; effluents; environmental impact; fertilizer rates; field experimentation; fish; fish farms; fish ponds; green beans; harvesting; irrigation water; leaves; magnesium; mineral fertilizers; nitrogen; nutrient content; nutritional status; phosphorus; plant tissues; sampling; seasons; wastewater irrigation; Kenya
Abstract:
... When fish are recovered from ponds, the effluent is often drained presenting both an environmental challenge and an agricultural opportunity. The effects of irrigation with pond effluent and its interaction with applied fertilizer were assessed in a field experiment using French bean (Phaseoulus vulgaris) over two growing seasons near Sagana, Kenya. Fresh yield of beans was recorded at harvest, an ...
DOI:
10.1081/CSS-120030578

6. Effect of organic and inorganic phosphorus sources on maize yields in an acid soil in western Kenya

Author:
Opala, P. A.; Okalebo, J. R.; Othieno, C. O.; Kisinyo, P.
Source:
Nutrient cycling in agroecosystems 2010 v.86 no.3 pp. 317-329
ISSN:
1385-1314
Subject:
Zea mays; corn; phosphorus; phosphorus fertilizers; nutrient availability; grain yield; acid soils; nutrient deficiencies; phytotoxicity; aluminum; liming; triple superphosphate; rock phosphate; animal manures; Tithonia diversifolia; green manures; urea; fertilizer rates; temporal variation; residual effects; exchangeable aluminum; economic analysis; Kenya
Abstract:
... Maize production in western Kenya is commonly limited by P deficiencies and aluminum phytotoxicity. Due to high costs of imported fertilizers and lime, focus is now shifting to solutions that utilize local resources. We tested the effect of three inorganic P sources i.e., triple superphosphate (TSP), Minjingu phosphate rock (MPR) and Busumbu phosphate rock (BPR), each applied in combination with t ...
DOI:
10.1007/s10705-009-9294-3

7. Effects of compound fertilizer and canola green manure on nutrient use efficiency, growth and yield of potato tuber (Solanum tuberosum L.) in Nakuru, Kenya

Author:
Norbert Iraboneye; Nancy W Mungai; Miriam K Charimbu
Source:
Fundamental and applied agriculture 2020 v.5 no.4 pp. 537-554
ISSN:
2518-2021
Subject:
Solanum tuberosum; agriculture; calcium ammonium nitrate; canola; diammonium phosphate; economic feasibility; farms; fertilizer rates; field experimentation; green manures; nitrogen; nitrogen-phosphorus fertilizers; nutrient use efficiency; phosphorus; plant height; potassium; potatoes; soil; Kenya
Abstract:
... Unbalanced fertilization is a problem affecting potato production in Kenya, where continuous use of nitrogen-phosphorus fertilizer (diammonium phosphate: DAP) has led to depletion of other macro and micronutrients. Hence, the need to assess alternative soil amendments including use of multinutrients compound fertilizer and canola green manure in potato production. Field and pot experiments were co ...
DOI:
10.5455/faa.110466

8. Effects of conservation tillage, crop residue and cropping systems on changes in soil organic matter and maize-legume production: a case study in Teso District

Author:
Anyanzwa, H.; Okalebo, J. R.; Othieno, C. O.; Bationo, A.; Waswa, B. S.; Kihara, J.
Source:
Nutrient cycling in agroecosystems 2010 v.88 no.1 pp. 39-47
ISSN:
1385-1314
Subject:
crop residue management; soil organic carbon; intercropping; phosphorus; grain yield; soil fertility; Zea mays; Glycine max; crop residues; corn; nitrogen fertilizers; nitrogen; fertilizer rates; soybeans; phosphorus fertilizers; conservation tillage; Kenya
Abstract:
... The effects of conservation tillage, crop residue and cropping systems on the changes in soil organic matter (SOM) and overall maize-legume production were investigated in western Kenya. The experiment was a split-split plot design with three replicates with crop residue management as main plots, cropping systems as sub-plots and nutrient levels as sub-sub plots. Nitrogen was applied in each treat ...
DOI:
10.1007/s10705-008-9210-2

9. Effects of fertilizer on inorganic soil N in East Africa maize systems: vertical distributions and temporal dynamics

Author:
Katherine L. Tully; Jonathan Hickman; Madeline McKenna; Christopher Neill; Cheryl A. Palm
Source:
Ecological applications 2016 v.26 no.6 pp. 1907-1919
ISSN:
1051-0761
Subject:
Zea mays; clay soils; corn; cropland; fertilizer rates; leaching; nitrogen; sandy soils; soil profiles; soil texture; temporal variation; Kenya; Tanzania
Abstract:
... Fertilizer applications are poised to increase across sub‐Saharan Africa (SSA), but the fate of added nitrogen (N) is largely unknown. We measured vertical distributions and temporal variations of soil inorganic N following fertilizer application in two maize (Zea mays L.)‐growing regions of contrasting soil type. Fertilizer trials were established on a clayey soil in Yala, Kenya, and on a sandy s ...
DOI:
10.1890/15-1518.1

10. Evaluation of lablab and velvet bean fallows in a maize production system for improved livestock feed supply in semiarid tropical Kenya

Author:
Njarui, D.M.G.; Mureithi, J.G.
Source:
Animal production science 2010 v.50 no.3 pp. 193-202
ISSN:
1836-0939
Subject:
crop residue management; feeds; profitability; green manures; Lablab purpureus; crude protein; Zea mays; Mucuna pruriens; crop residues; corn; forage legumes; fallow; livestock; crop rotation; nitrogen fertilizers; nitrogen; fertilizer rates; semiarid zones; nutritive value; Kenya
Abstract:
... The mixed crop-livestock farming systems of semiarid tropical Kenya are characterised by low livestock feed supply. The contribution of lablab and velvet bean to fodder production in a maize production system was investigated in the eastern region of Kenya. The experiment was run in three cycles, where each cycle consisted of a short legume fallow phase of ~6 months, followed by a maize-cropping p ...
DOI:
10.1071/AN09137

11. Ex Ante Welfare Analysis of Technological Change: The Case of Nitrogen Efficient Maize for African Soils

Author:
Genti Kostandini; Roberto La Rovere; Zhe Guo
Source:
Canadian journal of agricultural economics 2016 v.64 no.1 pp. 147-168
ISSN:
0008-3976
Subject:
Zea mays; agroecological zones; corn; fertilizer rates; fertilizers; households; nitrogen; nutrient use efficiency; people; poverty; soil; technological change; Kenya; South Africa
Abstract:
... This study evaluates the potential impacts of the Improved Maize for African Soils (IMAS) project in two countries of Africa: Kenya and South Africa. The IMAS varieties offer significant yield advantages for regions where low or no fertilizer is used. The analysis uses spatial production data and household data to account for the level of fertilizer use in different agroecological zones of the cou ...
DOI:
10.1111/cjag.12067

12. Factors affecting the use of fertilizers and manure by smallholders: the case of Vihiga, western Kenya

Author:
Waithaka, Michael M.; Thornton, Philip K.; Shepherd, Keith D.; Ndiwa, Nicholas N.
Source:
Nutrient cycling in agroecosystems 2007 v.78 no.3 pp. 211-224
ISSN:
1385-1314
Subject:
farm surveys; nutrient content; simulation models; mineral fertilizers; animal manures; plant nutrition; farm inputs; agricultural land; fertilizer rates; crop yield; socioeconomic status; soil fertility; statistical analysis; agricultural education; social environment; crop management; agricultural policy; Kenya
Abstract:
... Sub-Saharan Africa faces huge food supply challenges due to increasing human population, limited opportunities to increase arable land, and declining yields associated with continuously declining soil fertility. To cater for their food requirements, smallholders use only modest levels of inorganic fertilizers and rely to a large extent on manure, which is generally of low quality. To explore facto ...
DOI:
10.1007/s10705-006-9087-x

13. Fertility management for maize cultivation in some soils of Western Kenya

Author:
Ajebesone F. Ngome; Mathias Becker; Kelvin M. Mtei; Frank Mussgnug
Source:
Soil & tillage research 2011 v.117 no. pp. 69-75
ISSN:
0167-1987
Subject:
carbon sinks; conventional tillage; corn; crop yield; fertilizer rates; mineral fertilizers; nitrogen content; nutrient balance; nutrient management; organic fertilizers; reduced tillage; soil fertility; soil types; Kenya
Abstract:
... Soil fertility loss in Western Kenya is exacerbated by inadequate nutrient management and causes reduced maize yields. Given the diversity of soil types, cropping seasons, and the resource endowment of farmers, the magnitude of the soil fertility decline and the effectiveness of management options to counteract this decline is likely to differ. Five organic and inorganic management options were co ...
DOI:
10.1016/j.still.2011.08.010

14. Fertilizer use in semi-arid areas of Kenya: analysis of smallholder farmers' adoption behavior under liberalized markets

Author:
Freeman, H. Ade; Omiti, John M.
Source:
Nutrient cycling in agroecosystems 2003 v.66 no.1 pp. 23-31
ISSN:
1385-1314
Subject:
educational status; family size; farmers; farms; fertilizer rates; fertilizers; markets; regression analysis; semiarid zones; Kenya
Abstract:
... This paper analyzes the factors influencing farm level fertilizer adoption decisions under an era of liberalized markets in Kenya using a Tobit regression model. The level of education of the household head, experience using fertilizer, growing a cash crop, availability of fertilizer in rural retail outlets, availability in small packages, and land pressure positively influenced fertilizer use, wh ...
DOI:
10.1023/A:1023355011400

15. Grain yield responses of lowland rice varieties to increased amount of nitrogen fertilizer under tropical highland conditions in central Kenya

Author:
Symon M. Njinju; Hiroaki Samejima; Keisuke Katsura; Mayumi Kikuta; Joseph P. Gweyi-Onyango; John M. Kimani; Akira Yamauchi; Daigo Makihara
Source:
Plant production science 2018 v.21 no.2 pp. 59-70
ISSN:
1349-1008
Subject:
biomass production; fertilizer rates; grain yield; nitrogen; nitrogen fertilizers; rice; temperature; Kenya
Abstract:
... Tropical highland conditions in Mwea Kenya, ensure the high radiation and the large day–night temperature differences. Such conditions are generally believed to promote rice growth and yield, but the current grain yield is lower than the expectation. In the current standard N fertilizer practice in Mwea, 75 kg nitrogen (N) ha⁻¹ is applied in three splits at fixed timing. The effects of increases i ...
DOI:
10.1080/1343943X.2018.1436000

16. High fertilizer rates increase susceptibility of tea to water stress

Author:
Cheruiyot, Erick K.; Mumera, Louis M.; Ng'etich, Wilson K.; Hassanali, Ahmed; Wachira, Francis N.
Source:
Journal of plant nutrition 2010 v.33 no.1-4 pp. 115-129
ISSN:
0190-4167
Subject:
Camellia sinensis; tea; nitrogen fertilizers; fertilizer rates; soil water content; water stress; drought; drought tolerance; container-grown plants; duration; plant-water relations; dry matter partitioning; field experimentation; plant growth; leaf area; Kenya
Abstract:
... A study to determine the association of fertilizer with soil water deficit in tea [Camellia sinensis (L.) O. Kuntze] was conducted in a rain-out shelter using potted plants, in which five rates of fertilizer (0, 75, 150, 225 and 300 kg Nitrogen ha-1) and six levels of soil water content (38, 34, 30, 26, 22 and 18% v/v) were applied in a complete randomized design and replicated three times. The so ...

17. Immediate and residual effects of lime and phosphorus fertilizer on soil acidity and maize production in western kenya

Author:
P. O. KISINYO; C. O. OTHIENO; S. O. GUDU; J. R. OKALEBO; P. A. OPALA; W. K. NG'ETICH; R. O. NYAMBATI; E. O. OUMA; J. J. AGALO; S. J. KEBENEY; E. J. TOO; J. A. KISINYO; W. R. OPILE
Source:
Experimental agriculture 2014 v.50 no.1 pp. 128-143
ISSN:
1469-4441
Subject:
Zea mays; acid soils; aluminum; bicarbonates; calcium carbonate; corn; exchangeable aluminum; fertilizer rates; grain yield; liming materials; phosphorus; phosphorus fertilizers; residual effects; soil nutrients; soil pH; soil sampling; triple superphosphate; Kenya
Abstract:
... Soil acidity and phosphorus (P) deficiency are some of the major causes of low maize yields in Kenya. This study determined the immediate and residual effects of lime and P fertilizer on soil pH, exchangeable aluminium (Al), available P, maize grain yield, agronomic P use and P fertilizer recovery efficiencies on a western Kenya acid soil. The treatments were: P fertilizer (0, 26 and 52 kg P ha⁻¹ ...
DOI:
10.1017/S0014479713000318

18. Impact of agricultural management on arbuscular mycorrhizal fungal communities in Kenyan ferralsol

Author:
Mathimaran, N.; Ruh, R.; Jama, B.; Verchot, L.; Frossard, E.; Jansa, J.
Source:
Agriculture, ecosystems & environment 2007 v.119 no.1-2 pp. 22-32
ISSN:
0167-8809
Subject:
Allium porrum; Zea mays; vesicular arbuscular mycorrhizae; Helianthus annuus; mycorrhizal fungi; plant nutrition; fertilizer rates; host plants; corn; forage legumes; phosphorus fertilizers; leeks; species diversity; fungal spores; field experimentation; Crotalaria; crop rotation; Kenya
Abstract:
... Arbuscular mycorrhizal fungi (AMF) represent a functionally important component of soil microbial community, being of particular significance for plant mineral nutrition in tropical agroecosystems. The effects of crop rotation of maize (Zea mays L.) with crotalaria (Crotalaria grahamiana Wight & Arn.) versus continuous maize and phosphorus (P) fertilization on AMF spore community composition and d ...
DOI:
10.1016/j.agee.2006.06.004

19. Impacts of enhanced fertilizer applications on tropospheric ozone and crop damage over sub-Saharan Africa

Author:
Yaoxian Huang; Jonathan E. Hickman; Shiliang Wu
Source:
Atmospheric environment 2018 v.180 pp. 117-125
ISSN:
1352-2310
Subject:
air quality; atmospheric chemistry; crop damage; crop yield; crops; emissions; fertilizer rates; food security; growing season; intensive farming; models; nitric oxide; ozone; troposphere; Kenya
Abstract:
... Fertilizer-induced nitrogen oxides (NOx) emissions in sub-Saharan Africa are expected to increase substantially in the coming decades, driven by increasing application of fertilizers to increase crop yields in an effort to attain food security across the continent. In many parts of sub-Saharan Africa, surface ozone (O3) is sensitive to increasing atmospheric concentrations of NOx. In this study, w ...
DOI:
10.1016/j.atmosenv.2018.02.040

20. Influence of improved fallow systems and phosphorus application on arbuscular mycorrhizal fungi symbiosis in maize grown in western Kenya

Author:
Muchane, Mary Nyawira; Jama, Bashir; Othieno, Caleb; Okalebo, Robert; Odee, David; Machua, Joseph; Jansa, Jan
Source:
Agroforestry systems 2010 v.78 no.2 pp. 139-150
ISSN:
0167-4366
Subject:
Zea mays; corn; Crotalaria; Tithonia diversifolia; fallow; continuous cropping; phosphorus; mycorrhizal fungi; vesicular arbuscular mycorrhizae; nitrogen; nutrient uptake; plant nutrition; acid soils; phosphorus fertilizers; field experimentation; on-farm research; fertilizer rates; yields; Kenya
Abstract:
... A field study was carried out on a six-year-old on-farm field trial during long-rains season (April-August) 2003 to investigate the effect of improved fallow systems and phosphorus application on arbuscular mycorrhiza fungi (AMF) symbiosis in maize. The trial comprised of maize rotated with a fast growing leguminous Crotalaria grahamiana fallow and a non-leguminous Tithonia diversifolia fallow for ...
DOI:
10.1007/s10457-009-9249-3