Effects of organic and mineral sources of nutrients on maize yields in three districts of central Kenya

Kimani, S.K.; Esilaba, Anthony O.; Odera, M.M.; Kimenye, L.N.; Vanlauwe, Bernard; Bationo, A.

doi:10.1007/978-1-4020-5760-1_32

Cited by 14 publications

(14 citation statements)

References 6 publications

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“…2a). While the addition of N fertilizers has been shown to result in greater crop yields than ORs (Baggs et al 2000;Bremer and van Kessel 1992;Ladd and Amato 1986), greater crop yields have been observed following the combined application of ORs with N fertilizers (Kimani et al 2007;Kramer et al 2002;Mtambanengwe et al 2006 1139 (51) 654 (28) 385 (22) 100 (5) 499 (26) 456 (21) 43 (5) 325 (16) 160 (5) 135 (10) 315 (14) 38 (2) 207 (10) 70 (3) 30 (2) ≤ 600…”

Section: Benefits Of External Nutrientsmentioning

confidence: 95%

Does the combined application of organic and mineral nutrient sources influence maize productivity? A meta-analysis

2010

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The combined application of organic resources (ORs) and mineral fertilizers is increasingly gaining recognition as a viable approach to address soil fertility decline in sub-Saharan Africa (SSA). We conducted a meta-analysis to provide a comprehensive and quantitative synthesis of conditions under which ORs, N fertilizers, and combined ORs with N fertilizers positively or negatively influence Zea mays (maize) yields, agronomic N use efficiency and soil organic C (SOC) in SSA. Four OR quality classes were assessed; classes I (high quality) and II (intermediate quality) had >2.5% N while classes III (intermediate quality) and IV (low quality) had <2.5% N and classes I and III had <4% polyphenol and <15% lignin. On the average, yield responses over the control were 60%, 84% and 114% following the addition of ORs, N fertilizers and ORs + N fertilizers, respectively. There was a general increase in yield responses with increasing OR quality and OR-N quantity, both when ORs were added alone or with N fertilizers. Surprisingly, greater OR residual effects were observed with high quality ORs and declined with decreasing OR quality. The greater yield responses with ORs + N fertilizers than either resource alone were mostly due to extra N added and not improved N utilization efficiency because negative interactive effects were, most often, observed when combining ORs with N fertilizers. Additionally, their agronomic N use efficiency was not different from sole added ORs but lower than N fertilizers added alone. Nevertheless, positive interactive effects were observed in sandy soils with low quality ORs whereas agronomic use efficiency was greater when smaller quantities of N were added in all soils. Compared to sole added ORs, yield responses for the combined treatment increased with decreasing OR quality and greater yield increases were observed in sandy (68%) than clayey soils (25%). While ORs and ORs + N fertilizer additions increased SOC by at least 12% compared to the control, N fertilizer additions were not different from control suggesting that ORs are needed to increase SOC. Thus, the addition of ORs will likely improve nutrient storage while crop yields are increased and more so for high quality ORs. Furthermore, interactive effects are seldom occurring, but agronomic N use efficiency of ORs + N fertilizers were greater with low quantities of N added, offering potential for increasing crop productivity.

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Section: Benefits Of External Nutrientsmentioning

confidence: 95%

Does the combined application of organic and mineral nutrient sources influence maize productivity? A meta-analysis

2010

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“…It is described by Vanlauwe and Zingore (2011) as a set of soil fertility management practices that necessarily include the use of fertilizer, organic inputs, and improved germplasm combined with the knowledge on how to adapt these practices to local conditions, aiming at maximizing agronomic use efficiency of the applied nutrients and improving crop productivity. Because of the pressing need for global food security, many articles have been published which relate ISFM to the production of annual food crops like maize (Ikerra et al, 2007;Kimani et al, 2007), and rice (Kaizzi et al, 2007), giving lesser attention to perennial crops like coffee. It is no longer wondering then that the role of ISFM for coffee in Tanzania and the socio-economic perception of it have not been studied to any significant detail.…”

Section: Introductionmentioning

confidence: 99%

Farmers perception of soil fertility problems and their attitudes towards integrated soil fertility management for coffee in Northern Tanzania

Maro¹

2013

J. Soil Sci. Environ. Manage.

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A study was conducted in Hai and Lushoto districts, Northern Tanzania to establish the farmers' perception of soil fertility problems and their attitudes towards integrated soil fertility management (ISFM) for coffee, thereby identifying the appropriate intervention strategies. The study was based on a structured questionnaire involving 126 respondents. Both farmers' awareness of the problem and their attitudes were highly significant (at p<0.01). Age, household size, and adoption of improved coffee varieties, affected farmers' awareness significantly (p<0.05). As for farmers' attitudes, six of the eight predictors were significant (p<0.05). Age, household size, adoption of new varieties and total farm income were highly significant (p<0.01). Age, total land under coffee and total off-farm income negatively affected farmers' attitudes. As farmers get older, they tend to refrain from innovation. Larger farms are likely to exert more pressure on the available organic resources. With multiple farms, distant farms are likely to receive less attention. When off-farm income was considered, multiple ventures compete for the farmers' time, resources and attention. For the two districts, ISFM interventions will make a better impact to younger and more energetic farmers with sufficient lands for commercial coffee production and to farmers who depend largely on this resource for their livelihood.

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“…Increasing population has placed too much pressure on the limited land resources thereby leading to continuous cropping particularly of cereals after cereals [3]. Several soil fertility improvement technologies have not yielded their desired effects in Africa due to the dynamics and contrasting agroecosystems with regards to both socioeconomic and biophysical conditions of the African farming systems [4,5].…”

Section: Introductionmentioning

confidence: 99%

Soil Amendments and Rotation Effects on Soybean and Maize Growths and Soil Chemical Changes in Northern Ghana

Kanton¹,

Buah²,

Larbi³

et al. 2017

International Journal of Agronomy

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A four-year field trial was conducted at Bonia in the Upper East Region of Ghana to evaluate soybean-maize rotation amendment systems. The treatments included soybean without amendment, inoculated soybean, inoculated soybean with fertisol, inoculated soybean with phosphorus and potassium (P, K), inoculated soybean with P, K and fertisol, inoculated soybean with nitrogen, phosphorus, and potassium (N, P, K), and continuous maize. Treatments were arranged in a randomized complete block design with four replications. Inoculation negatively affected yields by 2% and 14% in 2013 and 2015, respectively. Soil amendments with P, K or N, P, K increased yields within 45-51%, fertisol increased by 95%, and integration of P, K and fertisol recorded 76% increment of inoculated soybean. Yields of maize increased by 1%, 20%, 25%, 43%, 44%, and 46% under inoculated soybean, inoculated soybean with N, P, K, inoculated soybean with P, K, inoculated soybean with fertisol, soybean without amendment, and inoculated soybean with P, K and fertisol, respectively. Maize after inoculated soybean with fertisol and maize after inoculated soybean with P, K and fertisol consistently scored higher benefit-cost ratio across the two years of experimentation. Thus, the two systems are conceivable for recommendation to the farmers in northern Ghana.

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Effects of organic and mineral sources of nutrients on maize yields in three districts of central Kenya

Cited by 14 publications

References 6 publications

Does the combined application of organic and mineral nutrient sources influence maize productivity? A meta-analysis

Does the combined application of organic and mineral nutrient sources influence maize productivity? A meta-analysis

Farmers perception of soil fertility problems and their attitudes towards integrated soil fertility management for coffee in Northern Tanzania

Soil Amendments and Rotation Effects on Soybean and Maize Growths and Soil Chemical Changes in Northern Ghana

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