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Gebrekidan, Heluf; Belay, A.; Uloro, Yohannes; Zewdie, Eylachew

doi:10.1023/a:1009721411173

Cited by 11 publications

(2 citation statements)

References 13 publications

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“…The competition of micronutrients for calcium reduced the metal ion sorption due to CEC. Based on test outlined by Lindsay & Norvell [30], all the available Fe, Cu, and Mn were adequate, while Zn was found to be low in the soils studied by Fisseha [31]. Wekene & Heluf [32] reported that in Nitisols (Alfisols) of Bako area, the available Fe and Mn concentrations in the surface soils were in toxic range, whereas available Zn content was deficient particularly in the research farm soils due to continuous harvesting of crops.…”

Section: Agricultural Research and Technology: Open Access Journalmentioning

confidence: 97%

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Relevance of Organic Farming in Ethiopian Agriculture: Mission and Commitment with Second Green Revolution

Bb¹

2017

ARTOAJ

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Agriculture, with almost equal share of the twin farming systems of crop production and livestock development, characterizes the key issues of Ethiopian economy. The first green revolution could not have got its momentum in Ethiopia due to limitations associated mainly with improved varieties, assured irrigation and, inorganic fertilizers. The continued efforts in crop varieties improvement, inventorying of soil resources, watershed development, and related activities have now amplified the potential of Ethiopia to revolutionize its agricultural developments both livestock and crop productions. However, the message from the first green revolution in terms of soil health deterioration leading to malnutrition, polluted foodstuff and water and other types of contamination of agricultural products due to excessive use of inorganic fertilizers, chemicals, insecticides and pesticides has bitterly warned the scientists and even planners to move to some compromise in the use of inorganic materials as inputs. The use of organic resources alone or in integration with inorganic materials is the quick answer to such compromise. Needless to mention, the use of organic resources for soil fertility management is virtually known almost since the beginning of agriculture. In the same fashion, the present human population world-wide wants food stuff free of pollution, contamination or even adulteration caused by unwise and unscientific use of inorganic fertilizers and other agricultural chemicals, which were the main bearing to the yield increase during the first green revolution at the expense of the quality of the produces. The second green revolution relates to restoration of quality of produce and improvement of soil health and quality. Obviously, organic farming approach is the only option for its realization. The quality of organic resources and their fertilizer equivalence are the main criteria to be judged for effective utilization of the organic resources for soil fertility improvement and promotion of agricultural products both in quantity and quality. The contents of organic carbon, total nitrogen, lignin, polyphenol and C:N ratios are some of the basic parameters to be considered in quality assessment of the organic resources. Under natural environments, there are many plant species that are useful to soil fertility improvement, but our knowledge is limited. Knowledge of organic matter turnover in soils is of vital importance in order to estimate the amount of organic resource to be added to soils to maintain the organic matter status. Soils with high C:N ratio need to have very specific management practices. The enhancement of N and P status of soils with exposures to X-rays is recently established for further validation as well as application either in field or otherwise. The clue of second green revolution lies on quality improvement of agricultural produces and this could be achieved by how could the integration of organic resource with very selective amount of inorganic fertilizers be made effective for high yield...

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Section: Agricultural Research and Technology: Open Access Journalmentioning

confidence: 97%

“…Nitrate loss could be controlled significantly by planting Calliandra calothyrsus and Sesbania sesban [16]. Source: Kaboneka and Sabbe [31].…”

Section: Organic Resources As the Potential Sources To Promote Soil Fertilitymentioning

confidence: 99%

Relevance of Organic Farming in Ethiopian Agriculture: Mission and Commitment with Second Green Revolution

Bb¹

2017

ARTOAJ

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Effects of soil‐protecting agricultural practices on soil organic carbon and productivity in fruit tree orchards

Montanaro¹,

Celano²,

Dichio³

et al. 2009

Land Degrad Dev

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This 4-year on-farm study reports the effects of different agricultural practices on yield and soil organic carbon (SOC) in kiwifruit and apricot orchards grown in a Mediterranean area. Groups of plants under local orchard management (LOM,x) practices (i.e. soil tillage, removing of pruning residues and mineral fertilisers) were compared with plots under soil-protecting orchard management (SPOM) actions (i.e. cover crop, no-tillage, compost application and mulching of pruning residues). In the SPOM blocks fertilisation rate was based on plant demand and irrigation volumes calculated on the evapotranspiration values, while they were empirically calculated in the LOM plots. Results show that yield was 28–50 per cent enhanced by SPOM practices while SOC remained close to the initial values. In comparison with LOM plots, changed practices increased up to 28–90 per cent the amount of P and K, and 13 per cent that of N annually incorporated into soil increasing their reservoir in the soil. The study demonstrates that appropriate land management can increase the mean annual carbon soil inputs from about 15 to 90 t ha1 per year

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Effect of organic inputs from agroforestry species and urea on crop yield and soil properties at Wondo Genet, Ethiopia

Teklay

Nyberg

Malmer

2006

Nutr Cycl Agroecosyst

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The effect of combined inputs of green manure (GM) and urea on maize (Zea mays L.) productivity and soil characteristics was studied in an on-farm trial at Wondo Genet, southern Ethiopia. The GM species used were the legumes Albizia gummifera G.F. Gmel and Milletia ferruginea (Hochst.) Baker and the non-legumes Cordia africana Lam and Croton macrostachyus Del. The GM and urea were applied separately or combined in different proportions to give equal rates of 100 kg N ha -1 , while varying amounts of P and K were supplied by the GM. The experiment was carried out for two consecutive cropping seasons, but treatments were applied only during the first season. Yield increased by 10-84% in the combined treatments compared to the control, with the increase being significant in those treatments containing GM from Cordia and Croton, which had higher P and K but lower N and total polyphenol contents than those from Albizia and Milletia. Increasing the proportion of GM from the non-legumes tended to increase yield, but the opposite was true when the proportion of GM from the legumes was increased. This suggests that N interacted negatively with polyphenols, and/or the P and K supply from GM was more important than that of N. However, treatment effects on soil properties were not pronounced. It was concluded that a 'modest' input of £3.0 Mg ha -1 GM from Cordia/Croton might effect a reasonable yield but that the additional use of inorganic fertilisers is necessary for the GM to have a substantially increased effect. In addition, when organic materials having both high N and high total polyphenol contents (e.g. Albizia and Milletia) are used, they should constitute the smaller proportion of the GM/fertiliser mixture.

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Cited by 11 publications

References 13 publications

Relevance of Organic Farming in Ethiopian Agriculture: Mission and Commitment with Second Green Revolution

Relevance of Organic Farming in Ethiopian Agriculture: Mission and Commitment with Second Green Revolution

Effects of soil‐protecting agricultural practices on soil organic carbon and productivity in fruit tree orchards

Effect of organic inputs from agroforestry species and urea on crop yield and soil properties at Wondo Genet, Ethiopia

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