Wednesday, 18 March 2020

NEWSLETTER #34 - SOCIETY OF AFRICAN EARTH SCIENTISTS




Volume 9, Issue 1

January - March 2020


CONTENT
Chair's Foreword
Akin-Ojo's Physics Hub is an Inspiration for African Science Development
Earth Science Events
References and selected reading


Chair's Foreword*
We appreciate one of Africa's most influential scientists, Omololu Akin-Ojo of the East Africa Institute for Fundamental Research and consider how his vision could elevate science development in Africa. Primarily, Akin-Ojo's ideas are important in the drive to stem the ongoing brain drain of African scientists and loss of   trained personnel to industrialised nations.


Akin-Ojo's Physics Hub is an Inspiration for  African Science Development

Omololu Akin-Ojo is an African science visionary committed to making an international science hub in Africa [1], starting off his bold venture with his own subject area. He teaches theoretical physics at the East African Institute for Fundamental Research (EAIFR), which was opened by the Rwanda government in 2018 on the back of the governments prioritisation of  STEM (Science Technology Engineering and Mathematics) so that 90% of scholarships awarded are to STEM students. This is part of Rwanda's plan to promote scientific literacy [2].
   When Akin-Ojo first became interested in science as a youngster, he taught himself how to write computer code, but did not have the access to computers necessary to test the code he had written. His father despaired at the lack of opportunity for his son and encouraged him to study in the United States, where he was resident for 14 years and gained his PhD in physics.
   In 2012, Akin-Ojo returned to Nigeria to teach at the African University of Science and Technology, in Abuja before moving on to teach Theoretical Physics in his current role. The physics hub established by Akin-Ojo is rapidly becoming an international confluence point for world physicists, with visitors hailing from within Africa (Tanzania) and beyond (Iran, Australia, Argentina, etc). Akin-Ojo's idea to attract international scientists to an african hub is also given a boost by the Rwanda government, which has worked to create an attractive and safe environment for science collaboration to flourish.
   Akin-Ojo admits he finds difficulty trying to hang on to his talented students, who he encourages to stay and stem the African brain drain rather than pursue opportunities abroad; but admits that he struggles to retain the talent. One of the measures he has resorted to is encouraging diasporan scientists educated abroad to return to teach and lead workshops, etc.
   This is all very much in line with the African Union's ten year plan to stem the loss of African professionals with critical technical skills - estimated to reach 70,000 people annually [3]. The losses of qualified personnel annually are staggering: including emigrating doctors making up 75% of all their trained physicians in Mozambique, 70% in Angola, 59% in Malawi, 57% in Zambia and 51% in Zimbabwe. In the case of engineers, migration is leaving countries like Kenya with just 0.155 engineers per 1000 citizens and  Tanzania with even less at  0.048 engineers per 1000 citizens. On average Africa as a whole has about the same ratio of engineers to population as Tanzania, with just just 0.046 engineers per  1000 citizens. The desired ratio Africa needs is about 3.58 engineers per 1000 citizens.
   Akin-Ojo  envisages that the motivation of the students in delivering original international standard research at his physics hub, would lie in addressing the hardships students know from day-to day, such as lack of water, lack of light/electricity, etc. He is relentlessly practical in his outlook and is not looking for African science development to be stalled due to lack of resources. Rather, he makes the powerful case that African research can work within its means to deliver tangible research progress with the resources that are at disposal; citing the example of his own field of research,  theoretical physics,  which requires nothing more than basic paper and pencil and the employment of ingenious thought experiments to delve into the deepest topics of research including even questions of cosmology and related topics such as dark matter.
   It is refreshing to come across an African scientist with Akin-Ojo's optimistic outlook which looks to inspire the progress of science on the continent, making use of whatever resources already  lie at our disposal.
Earth Science Events

April 16-17, 2020
Earth and Space Science and Engineering
VISION: 
VENUE: Cape Town, South Africa


June 29, 2020
International Conference on Oceanography and Earth Sciences
VISION: Aims to bring together leading academic scientists, professors, students and research scholars to exchange experiences and share research results about all aspects of oceanography and earth sciences,
VENUE: Marrakesh, Morocco.

November 5-6, 2020
International Conference on Earth Sciences and Climate Change
VISION: Various aspects of earth sciences and climate change including, biodiversity, bio-degradation, conservation, deforestation,  impact on human health health among  many other issues.
VENUE: Marrakesh, Morocco.


References and selected reading

1] Lewton, T., The Man making Rwanda into a Hub for Physics, Quanta Magazine, 2020.https://www.quantamagazine.org/omololu-akin-ojo-is-making-rwanda-into-a-hub-for-physics-20200303/
2] University World News Africa Edition, University seeks massive increase in STEM students,  by J. d'amour Mbonyinshuti, September 2019.
3] University World News Africa Edition, African Union devises ten year plan to stem brain drain,  by W. Kigotho, February 2018.


*Board of the Society of African Earth Scientists: Dr Enas Ahmed (Egypt), Osmin Callis (Secretary - Guyana/Nigeria), Mathada Humphrey (South Africa), Ndivhuwo Cecilia Mukosi (South Africa), Damola Nadi (Nigeria),  Dr Chukwunyere Kamalu (Chair - Nigeria).




Sunday, 15 March 2020

NEWSLETTER #33 - SOCIETY OF AFRICAN EARTH SCIENTISTS




Volume 8, Issue 4

October - December 2019


CONTENT
Chair's Foreword
Research into Indigenous Technologies (evaluation  of soil and water conservation measures)
Earth Science Events
References and selected reading


Chair's Foreword*
We address indigenous soil and water conservation (SWC) measures and progress so far made in their modern evaluation to put our indigenous technologies on a sound scientific footing. By and large, results so far indicated that  stone bunds served to conserve soil and water and increase crop yields.  Also, studies evaluating Zai planting pits show almost unequivocally that  they are a very effective means of improving soil fertility, conserving soil and water, as well as increasing crop yields. Barriers to establishing the effectiveness of these soil and water conservation measures presented themselves as ranging in form from political reforms and a focus on externally driven projects to misleading mathematical/physical models developed in very different conditions to those they are applied to - as in the case of work undertaken in the highlands of Ethiopia. As a result of model predictions being found at odds with measurements made in the field over a decade, caution was warranted in the application of such models.


Research into Indigenous Technologies (evaluation of soil and water conservation measures)

It remains a challenge for African science institutions, to put African indigenous technologies on a sound scientific footing by evaluation of their effectiveness. This work has already began, as we see from various studies coming out of Ethiopia on the effectiveness of stone bunds as a soil and water conservation (SWC) measure and also effectiveness of Zai planting pits in West Africa in Burkina Faso.

Stone and Soil Bunds serve to reduce runoff erositivity, soil material and water losses
    There has been a fair volume of study conducted on  soil/stone bunds, which are a long established traditional measure to reduce runoff erosive energy and water and soil losses.  A study by Adimassu, Mekonnen, Yirga and Kessler [1] in 2014 compared the performance of three distinct treatments:

a) (sb): Barley cultivated land with graded soil bunds;
 b) (F): Fallow land and
 c) (Bc): Barley cultivated land without soil bunds protection.

   Results showed that treatment Sb brought about significant reduction in runoff and soil losses. Plots with Sb reduced the annual runoff by about 28% and the average annual soil loss by about 47%. Consequently Sb also reduced the loss of soil nutrients and organic carbon. Because the absolute losses were still high, there was a need to supplement Sb with land management measures to further control erosion and improve soil fertility. It was noted that despite positive impacts on soil quality Sb did not increase crop yield. In fact, Sb decreased yield. But this was explained exactly by the amount of land lost to soil bunding as opposed to being used to grow crops.
   A study conducted by Hengsdijk et al [2] in which a suite of physical models  have been applied to the Ethiopian highlands suggest ineffectiveness of SWC measures.  But the study results  were at odds with field measurements made by researchers from various international institutions over ten years in the Tigray region of Ethiopia [3]. This led the authors to conclude, in their response to the paper by Hengsdijk et al,  that there was a need to proceed with caution in applying physical models in cases where the conditions are quite different from those in which the model is developed.
  Other studies suggest that traditional soil and water conservation measures like stone bunds can increase crop yield as well as conserve soil and water. The 2007 study by Nyssen, et al [4], supports the effectiveness of stone bunds in increasing crop yields by 53%. It was also indicated that stone bunds were made more productive by the planting of trees.


Zai planting pits with manure placed to improve soil fertility and moisture retention

   A very helpful review of the science behind the effectiveness of the Zai planting pit system is provided by Danjuma et al (2015)[5].
   We learn that Zai (ancestral planting pits) provides an effective way of improving the management of degraded land and reducing soil erosion, vegetation loss and biodiversity, as well as improving grain yield.
  Zai is a term used by Burkina Faso farmers to refer to small planting pits of 20-30 cm diameter and 10-20 cm depth and spaced 60-80 cm apart. It is a traditional land rehabilitation technology  promoted by farmers in Burkina Faso to rehabilitate degraded drylands, and restore soil fertility. This technology is mainly applied in semi-arid areas, on slopes less than 5%. According to World Bank, Zai can increase  production by 500% if well executed. Manure is added to each planting pit. The organic matter attracts termites that are especially important in improving soil structure. This increased the water holding capacity of the soil 500%,
   It is highly notable that in the recent history of the development of land rehabilitation in Africa there has rightly been a light shone on some exceptional individual innovators in soil and water conservation and land rehabilitation from a degraded state. In 1984 a farmer named Yacouba Sawadogo began organising semi-annual market days to promote the use of Zai planting pits. By the year 2000, Yacouba's market days involved farmers from more than 100 villages in Burkina Faso. This was complimented by establishment of Zai schools and training run by other farmers from 1992 to 2009.
    The authors admit that the main constraint of the Zai technique is the labour involved in constructing the system. Studies cited between 300 and 450 hours of labour per hectare needed to dig holes for pits and 250 labour hours per hectare to add manure.
   However, the socio-economic benefits from Zai pits are  transformational for both community and environment if well executed. These benefits are numerous and include
- working well in compliment with other techniques such as stone contour bunding to restore degraded soil
- serving to collect and concentrate water at the plant as needed
- being an innovation that addresses the effects of land degradation, soil erosion and soil moisture stress
- being a good means of restoring soil health
- improving poor grain yields and quality of the product.

 
 
 

 
Earth Science Events

April 16-17, 2020
Earth and Space Science and Engineering
VISION: 
VENUE: Cape Town, South Africa


June 29, 2020
International Conference on Oceanography and Earth Sciences
VISION: Aims to bring together leading academic scientists, professors, students and research scholars to exchange experiences and share research results about all aspects of oceanography and earth sciences,
VENUE: Marrakesh, Morocco.

November 5-6, 2020
International Conference on Earth Sciences and Climate Change
VISION: Various aspects of earth sciences and climate change including, biodiversity, bio-degradation, conservation, deforestation,  impact on human health health among  many other issues.
VENUE: Marrakesh, Morocco.


References and selected reading

1]     Adimassu, Z., Mekonnen, K., Yirga, C., and A. Kessler, Effect of soil bunds on runoff, soil and nutrient losses and crop yield in the central highlands of Ethiopia, Land Degrad. Develop. 25: 554-564 (2014).
2] Hengsdijk, H., Maijerink, G., Mosugu, M., 2005. Modelling the effect of three soil and water conservation practices in Tigray.[ Agric. Ecosys. Environ. 105 (2005), 29-40.
3]  Nyssen, J., Nigussie Haregeweyn, Desheemaeker, K., Desta Gebremichael, Vancampenhout, K., Poesen, J., Mitiku Haile, Buytaert, W., Naudts, J., Deckers, J., Govers, G., Comment on "Modelling the effect of soil and water conservation practices in Tigray Ethiopia" , Agric. Ecosys. Environ. 114 (2006), 407-411.
4]  Nyssen, J., Poesen, J., Desta Gebremichael, Vancampenhout, K., D'aes, M., Gebremedhin Yihdego,  Govers, G., Leirs, H., Moeyersons, J., Naudts, J., Nigussie Haregeweyn,  Mitiku Haile, Deckers, J., Interdisciplinary onsite evaluationof stone bunds to control soil erosion on cropland in Northern Ethiopia, Soil and Tillage Res. 94 (2007), 151-163.
5]  Danjuma, M.N., and Mohammed, S.,  Zai Pits: A Catalyst for Restoration in the Drylands, IOSR Journal of Agric. & Vet. Sci. (IOSR), Volume 8, Issue 2 Ver.1 (Feb 2015)pp. 01-04.




*Board of the Society of African Earth Scientists: Dr Enas Ahmed (Egypt), Osmin Callis (Secretary - Guyana/Nigeria), Mathada Humphrey (South Africa), Ndivhuwo Cecilia Mukosi (South Africa), Damola Nadi (Nigeria),  Dr Chukwunyere Kamalu (Chair - Nigeria).