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Conservation agriculture-based resource saving technology for land resilience in northern Ethiopia

Tesfay Araya Weldeslassie UGent (2012)
abstract
Conventional soil cultivation practices have resulted globally in land degradation. The main causes of cropland degradation in northern Ethiopia are repeated plowing, complete removal of crop residue at harvest leaving no soil cover and aftermath overgrazing of the crop field. Conservation Agriculture (CA) system was combined with in-situ soil and water conservation practices, can lead to reduced runoff, soil and nutrient loss, and to increased amount of green water, crop yield, profitability and thereby, sustainability. Two medium-term tillage experiments were carried out (2005 to 2011) on a Vertisol to quantify changes in runoff, soil loss, soil fertility, soil moisture, soil quality, crop and economic productivity of two local conservation tillage practices modified to comply with CA principles, namely, derdero and terwah, in two contrasting agro-ecological zones in northern Ethiopia. The experimental layout was implemented in a randomized complete block design with three replications on permanent plots. The tillage treatments were (i) derdero+ (DER+) with a furrow and permanent raised bed planting system, 30% standing crop residue retention and no-tillage on top of the bed, (ii) terwah+ (TER+) with plowing once at planting, 30% standing crop residue retention and fresh broad beds, and (iii) conventional tillage (CT) with a minimum of three tillage operations and removal of crop residues. Wheat, hanfets (mixture of barley and wheat) and grass pea (Lathyrus sativus) crops were grown in rotation at the May Zegzeg catchment, while wheat, teff, barley (Hordeum vulgare) and grass pea crops were grown in rotation at the Gum Selasa experimental site. Glyphosate was sprayed starting from the third year (2007) at 2 l ha-1 before planting to control pre-emergent weed in DER+ and TER+. Our study demonstrated that the introduction of the CA based conservation practices had a positive effect on runoff, soil and nutrient loss, soil quality, green water, crop yield and economic performance, we argue that the avoidance of repeated tillage, requiring 10 to 16 oxen-span days per ha, depending on crop type and year, and the faster plowing pace at planting in DER+, will enable a reduction in oxen density with further natural resource benefits.
Please use this url to cite or link to this publication:
author
promoter
UGent and UGent
organization
year
type
dissertation (monograph)
subject
keyword
vertisol, teff, conservation agriculture, permanent raised bed, wheat
pages
XXV, 223 pages
publisher
Ghent University. Faculty of Bioscience Engineering
place of publication
Ghent, Belgium
defense location
Gent : Faculteit Bio-ingenieurswetenschappen (C1.009)
defense date
2012-10-08 16:00
ISBN
9789059895522
language
English
UGent publication?
yes
classification
D1
additional info
dissertation consists of copyrighted material
copyright statement
I have transferred the copyright for this publication to the publisher
id
3005334
handle
http://hdl.handle.net/1854/LU-3005334
date created
2012-10-03 14:06:19
date last changed
2012-10-05 10:09:03
@phdthesis{3005334,
  abstract     = {Conventional soil cultivation practices have resulted globally in land degradation. The main causes of cropland degradation in northern Ethiopia are repeated plowing, complete removal of crop residue at harvest leaving no soil cover and aftermath overgrazing of the crop field. Conservation Agriculture (CA) system was combined with in-situ soil and water conservation practices, can lead to reduced runoff, soil and nutrient loss, and to increased amount of green water, crop yield, profitability and thereby, sustainability. Two medium-term tillage experiments were carried out (2005 to 2011) on a Vertisol to quantify changes in runoff, soil loss, soil fertility, soil moisture, soil quality, crop and economic productivity of two local conservation tillage practices modified to comply with CA principles, namely, derdero and terwah, in two contrasting agro-ecological zones in northern Ethiopia. The experimental layout was implemented in a randomized complete block design with three replications on permanent plots. The tillage treatments were (i) derdero+ (DER+) with a furrow and permanent raised bed planting system, 30\% standing crop residue retention and no-tillage on top of the bed, (ii) terwah+ (TER+) with plowing once at planting, 30\% standing crop residue retention and fresh broad beds, and (iii) conventional tillage (CT) with a minimum of three tillage operations and removal of crop residues. Wheat, hanfets (mixture of barley and wheat) and grass pea (Lathyrus sativus) crops were grown in rotation at the May Zegzeg catchment, while wheat, teff, barley (Hordeum vulgare) and grass pea crops were grown in rotation at the Gum Selasa experimental site. Glyphosate was sprayed starting from the third year (2007) at 2 l ha-1 before planting to control pre-emergent weed in DER+ and TER+. Our study demonstrated that the introduction of the CA based conservation practices had a positive effect on runoff, soil and nutrient loss, soil quality, green water, crop yield and economic performance, we argue that the avoidance of repeated tillage, requiring 10 to 16 oxen-span days per ha, depending on crop type and year, and the faster plowing pace at planting in DER+, will enable a reduction in oxen density with further natural resource benefits.},
  author       = {Araya Weldeslassie, Tesfay},
  isbn         = {9789059895522},
  keyword      = {vertisol,teff,conservation agriculture,permanent raised bed,wheat},
  language     = {eng},
  pages        = {XXV, 223},
  publisher    = {Ghent University. Faculty of Bioscience Engineering},
  school       = {Ghent University},
  title        = {Conservation agriculture-based resource saving technology for land resilience in northern Ethiopia},
  year         = {2012},
}

Chicago
Araya Weldeslassie, Tesfay. 2012. “Conservation Agriculture-based Resource Saving Technology for Land Resilience in Northern Ethiopia”. Ghent, Belgium: Ghent University. Faculty of Bioscience Engineering.
APA
Araya Weldeslassie, T. (2012). Conservation agriculture-based resource saving technology for land resilience in northern Ethiopia. Ghent University. Faculty of Bioscience Engineering, Ghent, Belgium.
Vancouver
1.
Araya Weldeslassie T. Conservation agriculture-based resource saving technology for land resilience in northern Ethiopia. [Ghent, Belgium]: Ghent University. Faculty of Bioscience Engineering; 2012.
MLA
Araya Weldeslassie, Tesfay. “Conservation Agriculture-based Resource Saving Technology for Land Resilience in Northern Ethiopia.” 2012 : n. pag. Print.