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A middle path for Sri Lankan agriculture: Sustainable intensification – II

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By Professor W.A.J.M. De Costa
Senior Professor and Chair of Crop Science, Faculty of Agriculture, University of Peradeniya

Strategies to address the challenges posed by climate change on Sustainable Intensification

Cropping systems in all climatic zones of Sri Lanka at the lower (< 600 m above sea level) elevations are highly vulnerable to increasing temperatures and rainfall variability, which are two of the key features of climate change. Even those at higher elevations are not immune to these persistent trends in the climate because the crops and cropping systems at these elevations have evolved to be adapted to a lower temperature regime, which has been shown to be increasing at a faster rate than the temperatures at the lower elevations. Accordingly, incorporation of heat tolerance to all crops grown in Sri Lanka via a focused and sustained plant breeding effort is an essential medium-to long-term need.

It is important to note that unlike many new technologies that can be readily imported from overseas, new crop varieties have to be developed within Sri Lanka for them to be productive under the specific agro-environmental conditions (e.g. temperature, day length, rainfall regime, potential pests and diseases, soil conditions such as pH etc.). Accordingly, development of new crop varieties has to be based on the crop germplasm available in Sri Lanka. Even though foreign varieties with the required genes for heat tolerance may be incorporated via reproductive crossing or genetic engineering, such hybrid plants need to be genetically ‘purified’ and extensively tested under Sri Lankan agro-environmental conditions before being released to farmers. Therefore, given the challenging nature of the genetic and plant physiological modifications that need to be engineered in crops, new heat tolerant varieties of major food crops are unlikely to be released to Sri Lankan farmers in the near future.

Agronomic interventions to reduce the energy load on crops and soils should be introduced concurrently with the plant breeding efforts. In this regard, incorporation of shade into agricultural fields via suitable tree and shrub species, preferably leguminous trees, will be a win-win situation where several requirements for SI can also be fulfilled. The reduced radiation energy on the crop surface will reduce canopy temperature and thereby reduce the incidence of heat stress. Concurrent reduction of evapotranspiration rates will contribute to conservation of water and thereby increase the crops’ capacity to avoid possible drought periods. In addition to the amelioration of the crop’s microclimate, when properly managed through lopping and pruning, the shade trees can provide a supply of organic material to the soil and thereby ensure nutrient recycling.

A mulch of organic material will not only provide protection to the soil against building up excessive soil temperatures, but also help in conserving soil moisture while preventing erosion. Furthermore, the input of organic materials and their decomposition will bring about significant changes in the soil microbial population and thereby set in motion many of the soil biological, physico-chemical and ecological processes which are required for sustained regeneration of soil fertility. Incorporation of leguminous tree/shrub species will enable the harnessing of their ability to fix atmospheric nitrogen and thereby potentially reduce the requirement of inorganic nitrogen fertilizer.

Climate change is likely to accelerate crop developmental processes via increasing temperatures. While increasing temperatures have the possibility to increase crop growth rates in the currently cooler climates via increased photosynthetic rates, they are most likely to decrease growth rates in crops in the currently warmer climates via decreased photosynthetic rates and increased respiration rates. Similarly, all soil biological processes including decomposition of added organic material and release of nutrients through mineralization will be accelerated by the increased temperatures. Increased frequency of intermittent and terminal droughts will exert further limitations on crop growth and yields. These impacts of climate change will require careful fine tuning of the cropping systems and their management to increase resilience.

Many of the SI strategies have synergy with increasing crop resilience to climate change. For example, increasing water use efficiency of crops increase their drought tolerance. Strategies for increasing nutrient use efficiency can be synergised with strategies to reduce the emission greenhouse gases such as nitrous oxides and methane. Alternative water management strategies such as Alternate Wetting and Drying (AWD) and aerobic rice, which are primarily designed to reduce the total water use in rice cultivation, concurrently reduce methane emissions from rice fields. On the other hand, increased additions of organic material to crop lands could increase emissions of carbon dioxide, which is the major greenhouse gas that contributes to global warming and climate change. Therefore, careful management of different SI strategies is needed to maximize their benefits while minimising their adverse impacts.

Water management will have to play a key role in increasing climate resilience of Sri Lankan Agriculture. Climate models predict that the currently ‘wet’ areas (e.g. wet zone of Sri Lanka) could experience increased rainfall in a future climate, whereas the currently ‘dry’ areas (e.g. dry and intermediate zones of Sri Lanka) could experience decreased rainfall (termed as ‘wet getting wetter and dry getting drier’). Furthermore, climate models predict increased rainfall variability leading to a greater frequency of high rainfall events which are spaced apart over time. This means that there will be more extreme rainfall events leading to floods as well as more droughts in a future climate. In this regard, it is important to have a broad strategy to manage the river basins and the network of tank cascade systems in Sri Lanka to maximise the capture of excess water during high rainfall events and seasons, and ensure a controlled release to crop production and other purposes (e.g. hydropower generation) during dry periods. Rehabilitation of the networks of minor tanks in the cascade systems of major river basins such as the Mahaweli and Walawe, which had been abandoned or neglected with the implementation of the major irrigation schemes in these basins, could be a key initiative to ensure maximum use of rainwater that Sri Lanka receives in a future climate and thereby increase climate resilience in the cropping systems.

Concluding remarks

Sri Lankan Agriculture is at a critical juncture at present with a huge cloud hanging over its sustainability and capacity to ensure national food security in the face of biophysical challenges such as climate change, decreasing soil fertility and stagnating yields and socio-economic challenges such as increasing costs of production and decreasing farmer profits. Meeting these challenges require paradigm shifts in the way all stakeholders (i.e. farmers, researchers, extensionists, policy makers and all others in the entire value chain) approach the task of producing sufficient and safe food to the Sri Lankan people in an economically and environmentally sustainable manner. This situation presents an opportunity to have a new perspective and seek innovative and ‘out-of-the box’ solutions, especially while the Sri Lankan Agriculture is struggling to recover from the upheavals of recent policy decisions. In this regard, Sustainable Intensification offers a strategy and a set of practices among many others to all stakeholders, especially the farmers, researchers, extensionists and policy makers, to serious consider implementing. It is significant to note that Sustainable Intensification is increasingly adopted by a wide range of countries in all continents. Hence, it is appropriate that Sri Lanka is not left behind, but explores the potential of Sustainable Intensification for resolving the critical issues that its food production system and its associated value chain faces.

This article is adapted from a keynote address delivered by the author at the 3rd International Symposium on Agriculture organized by the Faculty of Agriculture of the Eastern University of Sri Lanka on the theme ‘Self-Sustaining Agriculture: Way forward for food security and safety’ on the 9th of March 2023. It has incorporated valuable comments on a first draft from Raj Gonsalkorale, Suchira Peiris, Vijith Gunawardena and Parakrama Jayasinghe.



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Fractious West facing a more solidified Eastern opposition

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An Iranian attack on a neighbouring Gulf state. Image courtesy BBC.

Going forward, it is hoped that a reported ceasefire agreement between the US and Iran would provide a basis for a degree of stability in the Middle East and pave the way for substantive peace talks between the powers concerned. The world is compelled to fall back on hope because there is never knowing when President Donald Trump would change his mind and plans on matters of the first importance. So erratic has he been.

Yet, confusion abounds on who has agreed to what. The US President is on record that a number of conditions put forward by him to Iran to deescalate tensions have been accepted by the latter, whereas Iran is yet to state unambiguously that this is so. For instance, the US side claims that Iran has come clear on the point that it would not work towards acquiring a nuclear weapons capability, but there is no official confirmation by Iran that this is so. The same goes for the rest of the conditions.

Accordingly, the peace process between the US and Iran, if such a thing solidly exists, could be said to be mired in uncertainty. Nevertheless, the wider publics of the world are bound to welcome the prospects of some sort of ceasing of hostilities because it would have the effect of improving their economic and material well being which is today under a cloud.

However, questions of the first magnitude would continue to bedevil international politics and provide the breeding ground for continued tensions between East and West. Iran-US hostilities helped highlight some of these divisive issues and a deescalation of these tensions would not inevitably translate into even a temporary resolution of these questions. The world community would have no choice but to take them up and work towards comprehending them better and managing them more effectively.

For example, there are thorny questions arising from the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). Essentially, this treaty bans the processing and use of nuclear weapons by states but some of the foremost powers are not signatories to it.

Moreover, the NPT does not provide for the destroying of nuclear arsenals by those signatory states which are already in possession of these WMDs. Consequently, there would be a glaring power imbalance between the latter nuclear-armed states and others which possess only conventional weapons.

Such a situation has grave implications for Iran’s security, for instance. The latter could argue, in view of the NPT restrictions, that the US poses a security threat to it but that it is debarred by the Treaty from developing a nuclear arms capability of its own to enable it to match the nuclear capability of the US. Moreover, its regional rival Israel is believed to possess a nuclear weapons capability.

Accordingly, a case could be made that the NPT is inherently unfair. The US would need to help resolve this vexatious matter going forward. But if it remains, US-Iran tensions would not prove easy to resolve. The same goes for Iran-Israeli tensions. Consequently, the Middle East would remain the proverbial ‘powder keg’.

Besides the above issues, the world has ample evidence that it could no longer speak in terms of a united NATO or West. Apparently, there could be no guarantee that US-NATO relations would remain untroubled in future, even if the current Iran-US standoff is peacefully resolved. US-NATO ties almost reached breaking point in the current crisis when the US President called on its NATO partners, particularly Britain, to help keep open the Hormuz Straits for easy navigation by commercial vessels, militarily, on seeing that such help was not forthcoming. Such questions are bound to remain sore points in intra-Western ties.

In other words, it would be imperative for the US’ NATO partners to help pull the US’ ‘chestnuts out of the fire’ going ahead. The question is, would NATO be willing to thus toe the US line even at the cost of its best interests.

For the West, these fractious issues are coming to the fore at a most unpropitious moment. The reality that could faze the West at present is the strong opposition shown to its efforts to bolster its power and influence by China and Russia. Right through the present crisis, the latter have stood by Iran, materially and morally. For instance, the most recent Security Council resolution spearheaded by the US which was strongly critical of Iran, was vetoed by China and Russia.

Accordingly, we have in the latter developments some marked polarities in international politics that could stand in the way of the West advancing its interests unchallenged. They point to progressively intensifying East-West tensions in international relations in the absence of consensuality.

It is only to be expected that given the substance of international politics that the West would be opposed by the East, read China and Russia, in any of the former’s efforts to advance its self interests unilaterally in ways that could be seen as illegitimate, but what is sorely needed at present is consensuality among the foremost powers if the world is to be ‘a less dangerous place to live in.’ Minus a focus on the latter, it would be a ‘no-win’ situation for all concerned.

It would be central to world stability for International Law to be upheld by all states and international actors. Military intervention by major powers in the internal affairs of other countries remains a principal cause of international mayhem. Both East and West are obliged to abide scrupulously with this principle.

From the latter viewpoint, not only did the West err in recent times, but the East did so as well. Iran, for instance, acted in gross violation of International Law when it attacked neighbouring Gulf states which are seen as US allies. Neither Iran nor the US-Israel combine have helped in advancing international law and order by thus taking the law into their own hands.

Unfortunately, the UN has been a passive spectator to these disruptive developments. It needs to play a more robust role in promoting world peace and in furthering consensual understanding among the principal powers in particular. The need is also urgent to advance UN reform and render the UN a vital instrument in furthering world peace. The East and West need to think alike and quickly on this urgent undertaking.

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Science-driven health policies key to tackling emerging challenges — UNFPA

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Dr. Dayanath Ranatunga

Marking World Health Day on April 7, health experts have called for a stronger commitment to science-based decision-making to address increasingly complex and evolving health challenges in Sri Lanka and beyond.

Dr. Dayanath Ranatunga, Assistant Representative of the United Nations Population Fund, stressed that health is no longer confined to hospitals or traditional medical systems, but is shaped by a broad spectrum of social, environmental, and technological factors.

“This year’s theme, ‘Together for Health. Stand with Science,’ reminds us that science is not only for laboratories or policymakers. It is a way of thinking and a tool that shapes everyday decisions,” he said.

Dr. Ranatunga noted that modern health challenges are increasingly interconnected, ranging from infectious diseases such as COVID-19 to climate-related risks, demographic shifts, and emerging forms of online violence.

He warned that maternal and newborn health continues to demand urgent attention despite progress. Globally, an estimated 260,000 women died from pregnancy and childbirth-related causes in 2023 alone—many of them preventable through timely, science-based interventions.

“In countries like Sri Lanka, where fertility rates are declining and survival rates improving, every pregnancy carries greater significance—not just for families, but for the future of communities and economies,” he said.

The UNFPA official also highlighted the growing threat of Technology Facilitated Gender-Based Violence (TFGBV), including cyber harassment and online abuse, noting that these forms of violence can have deep psychological consequences despite lacking visible physical harm.

He emphasised the need for multidisciplinary, science-informed approaches that integrate mental health, digital safety, and survivor-centered care.

Turning to demographic trends, Dr. Ranatunga pointed out that increasing life expectancy is bringing new challenges, particularly the rise of non-communicable diseases such as diabetes, cardiovascular illnesses, and cancers.

In Sri Lanka, nearly 13.9% of mothers develop diabetes during pregnancy, a trend attributed to obesity and unhealthy lifestyles, underscoring the urgent need for preventive healthcare strategies.

“Are we investing enough in prevention?” he asked, noting that early intervention and healthier lifestyles could significantly reduce long-term healthcare costs, especially in a country with a free public healthcare system.

He underscored the importance of data-driven policymaking, stating that scientific research and analytics enable governments to identify gaps, anticipate future needs, and allocate resources more effectively.

The UNFPA, he said, is already leveraging tools such as Geographic Information Systems (GIS) to improve access to maternal healthcare, including mapping travel times for pregnant women to reach health facilities.

Digital innovation is also transforming healthcare delivery, from telemedicine to real-time data systems, improving efficiency and ensuring continuity of care even during emergencies.

In Sri Lanka, partnerships between the government and development agencies are helping to modernise training institutions, including facilities in Batticaloa, equipping healthcare workers with both clinical and digital skills.

However, Dr. Ranatunga cautioned that technology alone is not a solution.

“It must be guided by evidence and grounded in equity,” he said, pointing out that women’s health remains significantly underfunded, with only about 7% of global healthcare research focusing on conditions specific to women.

He also drew attention to the growing health impacts of climate change, including extreme weather, food insecurity, and displacement, describing it as an emerging public health crisis.

“Health does not begin in hospitals. It is shaped by the environments we live in, the choices we make, and the systems we build,” he said.

Calling for renewed commitment, Dr. Ranatunga urged stakeholders to invest in prevention, embrace innovation, and ensure that science remains central to policy and practice.

“Science is not just about knowledge—it is about ensuring that everyone has the opportunity to live healthy, dignified lives, and that no one is left behind,” he added.

 

By Ifham Nizam

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Sharing the festive joy with ‘Awurudu Kaale’

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The visually impaired who make up Bright Light Band in Awurudu attire

Melantha Perera is well known as a very versatile musician.

He was involved with the band Mirage, as their keyboardist/vocalist, and was also seen in action with other outfits, as well, before embarking on a trip to Australia, as a solo artiste.

I now hear that he has plans to operate as a trio.

However, what has got many talking about Melantha, these days, is his awesome work with the visually impaired Bright Light Band.

They have worked out a special song for the Sinhala and Tamil New Year, aptly titled ‘Awurudu Kaale.

Says Melantha: “This song has been created to celebrate the spirit of the Sinhala and Tamil New Year and to share the joy of the Awurudu season with all Sri Lankans”.

Yes, of course, Melantha composed the song, with the lyrics written collaboratively by Melantha, Badra, and the parents of the talented performers, whose creative input brought the song to life during moments of inspiration.

Melantha Perera: Awesome work with Bright Light Band

This meaningful collaboration reflects the strong community behind the Bright Light Band.

According to Melantha, accompaning the song is a vibrant video production that also features the involvement of the parents, highlighting unity, joy, and togetherness.

Beyond showcasing their musical talents, the visually impaired members of Bright Light Band deliver a powerful message, through this project, that their abilities extend beyond singing, as they also express themselves through movement and dance.

Melantha expressed his satisfaction with the outcome of the project and looks forward to sharing it with audiences across the country during this festive season.

He went on to say that Bright Light Band extends its sincere gratitude to Bcert Australia for their generous Mian sponsorship, the CEO of the company, Samath Fernando, for his continuous support in making such initiatives possible, and Rukshan Perera for his personal support and encouragement in bringing this project to completion.

The band also acknowledges Udara Fernando for his invaluable contribution, generously providing studio space and accommodating extended recording sessions to suit the children’s availability.

Appreciation is warmly extended to the parents, whose unwavering commitment from ensuring attendance at rehearsals to supporting the video production has been instrumental in the success of this project.

Through ‘Awurudu Kaale’, Bright Light Band hopes to spread festive cheer and inspire audiences, proving that passion and talent know no boundaries.

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