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Contributions of the Tea Research Institute of Sri Lanka and its Future Role

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The TRI headoffice

100 Years of Tea Research:

The Tea Research Institute (TRI) of Sri Lanka is celebrating its centenary this year.  Hence, this is an appropriate time to review the contribution that the TRI has made to the sustenance of the Sri Lankan tea industry and assess its current and future challenges.

History and past achievements of the TRI

The tea industry of Sri Lanka started in 1867 with the first commercial tea plantation by James Taylor at Loolecondera Estate.  The TRI was started in 1925 as a result of the vision and the initiative of Robert Gordon Coombe, who recognized the need of an institute to provide research-based solutions to field- and processing problems encountered by the expanding tea plantations and to generate new technologies to take the industry forward in an increasingly competitive global market.  During the ensuing 100 years up to today, the Tea Research Institute has performed those primary functions that were expected from it at its inception, with varying degrees of success.  The tea industry, both in Sri Lanka and elsewhere, has evolved during these 100 years, going through several phases and facing a multitude of challenges.  For most of the past 100 years, the TRI of Sri Lanka has been at the forefront of innovations, research-based solutions and advisory services to sustain the Sri Lankan tea industry, enabling it to be economically profitable and globally competitive.  A few major achievements are given below.

There has been a vibrant plant breeding program which has produced more than 70 new cultivars where greater yield potential has been combined with appreciable tolerance of some of the major biotic stresses (diseases and pests) and abiotic stresses (drought).  Latest additions to this are four new cultivars of the TRI 5000 Series, which are recommended to the tea-growing regions at lower elevations (low-country).  These will be launched at the International Tea Symposium on the 10th and 11th of November to mark the centenary of the TRI.  All agronomic practices from soil rehabilitation and crop establishment to crop management and harvesting that are currently practiced by tea growers in Sri Lanka are the result of TRI’s long-term research.  Starting with the famous ‘Eden trial’ (initiated by Dr. T. Eden), which was the first long-term fertilizer experiment to be done anywhere in the world for a perennial crop, the TRI has provided the guidelines for soil fertility management through soil conservation and fertilizer applications.  The innovations and advances in tea processing technology generated by the TRI, most notably the fluid bed dryer, have ensured that Sri Lanka produced a tea of high quality, with a diverse range of unique characteristics.  The TRI has made significant contributions to elucidating the biochemical components of black tea and its health benefits, while developing a diverse range of products such as a tea wine, a carbonated drink and tea extracts for manufacture of chilled beverages.  The Pathology, Entomology and Nematology divisions of the TRI have been at the forefront of tackling some of the major pests and diseases of tea.  A landmark achievement in this regard was the successful control of the pest tea tortrix using a biological agent.  Importantly, the TRI has provided research-based guidelines on the correct use of agrochemicals for pest and disease control so that the consignments of made tea exported from Sri Lanka are within the maximum permissible limits of chemical residues (MRLs) as required by the different importing countries.  Therefore, TRI research has ensured that Sri Lanka produces the cleanest tea to the global market.  The latest contribution from the TRI to ensure market competitiveness of Ceylon Tea is the generation of the scientific data to characterize and formulate the Geographic Indicators (GI) for Ceylon Tea.  It is expected that Ceylon Tea will receive GI certification in the near future.

The TRI has provided benchmarks and guidance for ensuring economic sustainability of the tea production via assessment of costs of different steps of the process, while introducing alternative worker deployment models as a solution for the prevailing labour shortage and outmigration of labour from the tea plantations.  In parallel to its research program, the TRI provides an advisory and extension service which is highly sought after by managers of large plantations as well as smallholders.

Current and future challenges to the tea industry in Sri Lanka

The tea industry occupies a vital niche in the Sri Lankan economy and its socio-cultural landscape.  Currently, it brings in 1.43 billion US Dollars’ worth of foreign exchange revenue and contributes 1 – 2% to the national GDP while making up 51% of the export earnings from agricultural products.  It provides direct employment to 700,000 people which increases to 2.5 million people who depend directly or indirectly on the tea industry.  As such, it is imperative that steps are taken to ensure the sustainability of the tea industry.  This necessitates addressing several critical issues that the industry faces at present and is likely to face in the future.  A few of these are discussed below:

The need to replace an aging planting stock

Sri Lanka currently has an aging planting stock in its tea plantations and smallholdings.  The economic lifespan of a vegetatively propagated (VP) tea bush ranges from 25-30 years in the lower elevations (low-country) and 40-60 years in the higher elevations (up-country).  A significant portion of tea bushes in Sri Lanka’s tea plantations have passed their economic lifespan.  The same is true for smallholdings which are mostly concentrated in the low-country.  The large plantations contain an appreciable portion of low-yielding old seedling tea, which is well over 60-80 years old.  This aging planting stock is a major reason for the clear decline in national tea production, which after reaching a peak of 340 million kilograms of made tea in 2013-14, declined to 256 million kilograms in 2023.  This decline was reversed to 262 million kilograms in 2024, and the current government has set an ambitious target of achieving 400 million kilograms in 2030 with an export earnings target of 2.5 billion US Dollars.

Therefore, replanting has become a critically urgent necessity to ensure sustainability in the Sri Lankan tea industry.  Based on the productivity data of 2008, the TRI recommended an annual replanting rate of 2% per year (i.e. 2% of the existing tea area to be replanted every year).  However, according to TRI assessments, the current replanting rate stands at 0.6% per year so that the required rate of replanting to maintain adequate production levels has risen to 3-4% per year.  The high cost of replanting, which currently stands at Rs. 7.4 million per hectare, the 1½ to 2-year period without revenue (due to soil rehabilitation, replanting and bringing the plants to ‘bearing’) and the 8 to 10-year period of return-to-investment are major obstacles to increasing the replanting rate.  Therefore, urgent government intervention, in the form of a well-coordinated subsidy for replanting, is needed to arrest the productivity decline that is currently occurring due to this aging planting stock.  It is worth noting that the substantial investment that the industry currently puts in for fertilizer application and other field operations such as plucking, shade management and pruning does not yield its full benefit in terms of productivity, primarily because of the poor fertilizer response of this aging planting stock.  In this regard, there is a request by the Regional Plantation Companies (RPCs) to extend their current lease agreement, which is due to expire in another 20 years, to ensure that these companies invest adequately on the future development of the tea plantations.

Original building (called Linfield Bungalow) where TRI was started in 1925
in the present Pedro Estate in Nuwara Eliy

The need to address the prevailing severe labour shortage

Tea is a highly labour-intensive crop, especially in Sri Lanka.  A substantial portion of Sri Lanka’s tea is grown on hilly terrain which is not easily amenable to mechanization.  More importantly, the price premium that Ceylon Tea enjoys in the global market is primarily due to its unique quality characteristics that comes partly because of the ‘orthodox’ manufacturing process.  In order to ensure the quality characteristics of orthodox black tea, harvesting the tea shoots at the correct stage of maturity (ideally two leaves and a bud) is essential.  Currently, this is possible only by manual selective harvesting because at any given time, a tea bush grown in Sri Lanka contains several generations of shoots at different stages of maturity.  Therefore, selective harvesting of tea in Sri Lanka remains one of the most labour-intensive operations.  Research conducted by the TRI over the last decade has shown that non-selective machine harvesting incurs a yield reduction of 40% or more in comparison to manual harvesting at a frequency of every seven days (plucking round).  In contrast to tea grown in a tropical climate such as that in Sri Lanka, where a new generation of shoots is initiated weekly throughout the year, tea grown in sub-tropical or temperate climates in North India, Japan and China, which have a dormant period in the winter followed by an even generation of shoots in the spring, are amenable to non-selective machine harvesting.  It is also notable that our competitor countries such as Kenya does not depend as critically on quality as Ceylon Tea and as such can afford to implement non-selective machine harvesting.

Despite the yield reduction that is incurred, most plantations in Sri Lanka have been forced to use non-selective harvesting machines and extended manual plucking rounds because of the severe shortage of labour.  The labour force in the plantation sector, which stood at one million at the time of privatization in 1993, now stands at 100,000, out of which about 85% is in the tea sector.  This is primarily because of the outmigration of labour, especially the younger generation, from the plantations in search of more socially acceptable and financially attractive employment outside the plantation sector and overseas.  Even the smallholder sector is experiencing the shortage of pluckers which has resulted in extended plucking rounds.  Research in the TRI has shown clearly that extended plucking rounds reduce the quality characteristics of made tea because a higher proportion of mature leaves come into the harvest.  The TRI has addressed this critical issue of labour shortage in the tea industry via a two-pronged strategy.

Strategies to overcome the labour shortage

One strategy is to initiate a research program to develop a selective harvesting machine.  In the 1990s, the TRI developed a selective harvesting shear which reduced the labour requirement for plucking while ensuring selectivity and quality without a reduction in yield.  Currently, the TRI is engaged in a collaborative research program with the Arthur C. Clark Centre to develop a selective harvesting machine.  The present prototype that this program has produced achieves a 60% level of selectivity, which needs further improvement, before the machine can be commercialized.

Adoption of alternative worker deployment models (AWDs) is the second strategy that the TRI has proposed to arrest the outmigration of labour from plantations and ensure availability of adequate labour to maintain the plantations with good agricultural practices (GAPs).  The AWDs range from simple systems such as contract labour and cash plucking to revenue sharing and out-grower models, where the estate workers become trusted and respected partners in the venture.  Several regional plantation companies have adopted different variants of AWDs with varying degrees of success.  The TRI has been providing advice on the correct strategies of adopting different AWDs. (To be concluded)

The author (janendrad@gmail.com) acknowledges the information provided by Dr. H.W. Shyamalie, Principal Research Officer and Head of Agricultural Economics Division of the TRI and Dr. Mahasen Ranatunga, Director, Tea Research Institute.  Most ideas and strategies discussed in this article are the result of many fruitful discussions that took place over the last two decades during deliberations of different sub-committees of the TRI and in meetings of the Tea Research Board during the past year. (To be concluded tomorrow)



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Features

Ranking public services with AI — A roadmap to reviving institutions like SriLankan Airlines

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Efficacy measures an organisation’s capacity to achieve its mission and intended outcomes under planned or optimal conditions. It differs from efficiency, which focuses on achieving objectives with minimal resources, and effectiveness, which evaluates results in real-world conditions. Today, modern AI tools, using publicly available data, enable objective assessment of the efficacy of Sri Lanka’s government institutions.

Among key public bodies, the Supreme Court of Sri Lanka emerges as the most efficacious, outperforming the Department of Inland Revenue, Sri Lanka Customs, the Election Commission, and Parliament. In the financial and regulatory sector, the Central Bank of Sri Lanka (CBSL) ranks highest, ahead of the Securities and Exchange Commission, the Public Utilities Commission, the Telecommunications Regulatory Commission, the Insurance Regulatory Commission, and the Sri Lanka Standards Institution.

Among state-owned enterprises, the Sri Lanka Ports Authority (SLPA) leads in efficacy, followed by Bank of Ceylon and People’s Bank. Other institutions assessed included the State Pharmaceuticals Corporation, the National Water Supply and Drainage Board, the Ceylon Electricity Board, the Ceylon Petroleum Corporation, and the Sri Lanka Transport Board. At the lower end of the spectrum were Lanka Sathosa and Sri Lankan Airlines, highlighting a critical challenge for the national economy.

Sri Lankan Airlines, consistently ranked at the bottom, has long been a financial drain. Despite successive governments’ reform attempts, sustainable solutions remain elusive.

Globally, the most profitable airlines operate as highly integrated, technology-enabled ecosystems rather than as fragmented departments. Operations, finance, fleet management, route planning, engineering, marketing, and customer service are closely coordinated, sharing real-time data to maximise efficiency, safety, and profitability.

The challenge for Sri Lankan Airlines is structural. Its operations are fragmented, overly hierarchical, and poorly aligned. Simply replacing the CEO or senior leadership will not address these deep-seated weaknesses. What the airline needs is a cohesive, integrated organisational ecosystem that leverages technology for cross-functional planning and real-time decision-making.

The government must urgently consider restructuring Sri Lankan Airlines to encourage:

=Joint planning across operational divisions

=Data-driven, evidence-based decision-making

=Continuous cross-functional consultation

=Collaborative strategic decisions on route rationalisation, fleet renewal, partnerships, and cost management, rather than exclusive top-down mandates

Sustainable reform requires systemic change. Without modernised organisational structures, stronger accountability, and aligned incentives across divisions, financial recovery will remain out of reach. An integrated, performance-oriented model offers the most realistic path to operational efficiency and long-term viability.

Reforming loss-making institutions like Sri Lankan Airlines is not merely a matter of leadership change — it is a structural overhaul essential to ensuring these entities contribute productively to the national economy rather than remain perpetual burdens.

By Chula Goonasekera – Citizen Analyst

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Features

Why Pi Day?

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International Day of Mathematics falls tomorrow

The approximate value of Pi (π) is 3.14 in mathematics. Therefore, the day 14 March is celebrated as the Pi Day. In 2019, UNESCO proclaimed 14 March as the International Day of Mathematics.

Ancient Babylonians and Egyptians figured out that the circumference of a circle is slightly more than three times its diameter. But they could not come up with an exact value for this ratio although they knew that it is a constant. This constant was later named as π which is a letter in the Greek alphabet.

Archimedes

It was the Greek mathematician Archimedes (250 BC) who was able to find an upper bound and a lower bound for this constant. He drew a circle of diameter one unit and drew hexagons inside and outside the circle such that the sides of each hexagon touch the sides of the circle. In mathematics the circle passing through all vertices of a polygon is called a ‘circumcircle’ and the largest circle that fits inside a polygon tangent to all its sides is called an ‘incircle’. The total length of the smaller hexagon then becomes the lower bound of π and the length of the hexagon outside the circle is the upper bound. He realised that by increasing the number of sides of the polygon can make the bounds get closer to the value of Pi and increased the number of sides to 12,24,48 and 60. He argued that by increasing the number of sides will ultimately result in obtaining the original circle, thereby laying the foundation for the theory of limits. He ended up with the lower bound as 22/7 and the upper bound 223/71. He could not continue his research as his hometown Syracuse was invaded by Romans and was killed by one of the soldiers. His last words were ‘do not disturb my circles’, perhaps a reference to his continuing efforts to find the value of π to a greater accuracy.

Archimedes can be considered as the father of geometry. His contributions revolutionised geometry and his methods anticipated integral calculus. He invented the pulley and the hydraulic screw for drawing water from a well. He also discovered the law of hydrostatics. He formulated the law of levers which states that a smaller weight placed farther from a pivot can balance a much heavier weight closer to it. He famously said “Give me a lever long enough and a place to stand and I will move the earth”.

Mathematicians have found many expressions for π as a sum of infinite series that converge to its value. One such famous series is the Leibniz Series found in 1674 by the German mathematician Gottfried Leibniz, which is given below.

π = 4 ( 1 – 1/3 + 1/5 – 1/7 + 1/9 – ………….)

The Indian mathematical genius Ramanujan came up with a magnificent formula in 1910. The short form of the formula is as follows.

π = 9801/(1103 √8)

For practical applications an approximation is sufficient. Even NASA uses only the approximation 3.141592653589793 for its interplanetary navigation calculations.

It is not just an interesting and curious number. It is used for calculations in navigation, encryption, space exploration, video game development and even in medicine. As π is fundamental to spherical geometry, it is at the heart of positioning systems in GPS navigations. It also contributes significantly to cybersecurity. As it is an irrational number it is an excellent foundation for generating randomness required in encryption and securing communications. In the medical field, it helps to calculate blood flow rates and pressure differentials. In diagnostic tools such as CT scans and MRI, pi is an important component in mathematical algorithms and signal processing techniques.

This elegant, never-ending number demonstrates how mathematics transforms into practical applications that shape our world. The possibilities of what it can do are infinite as the number itself. It has become a symbol of beauty and complexity in mathematics. “It matters little who first arrives at an idea, rather what is significant is how far that idea can go.” said Sophie Germain.

Mathematics fans are intrigued by this irrational number and attempt to calculate it as far as they can. In March 2022, Emma Haruka Iwao of Japan calculated it to 100 trillion decimal places in Google Cloud. It had taken 157 days. The Guinness World Record for reciting the number from memory is held by Rajveer Meena of India for 70000 decimal places over 10 hours.

Happy Pi Day!

The author is a senior examiner of the International Baccalaureate in the UK and an educational consultant at the Overseas School of Colombo.

by R N A de Silva

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Features

Sheer rise of Realpolitik making the world see the brink

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A combined US-Israel attack on Iran.(BBC)

The recent humanly costly torpedoing of an Iranian naval vessel in Sri Lanka’s Exclusive Economic Zone by a US submarine has raised a number of issues of great importance to international political discourse and law that call for elucidation. It is best that enlightened commentary is brought to bear in such discussions because at present misleading and uninformed speculation on questions arising from the incident are being aired by particularly jingoistic politicians of Sri Lanka’s South which could prove deleterious.

As matters stand, there seems to be no credible evidence that the Indian state was aware of the impending torpedoing of the Iranian vessel but these acerbic-tongued politicians of Sri Lanka’s South would have the local public believe that the tragedy was triggered with India’s connivance. Likewise, India is accused of ‘embroiling’ Sri Lanka in the incident on account of seemingly having prior knowledge of it and not warning Sri Lanka about the impending disaster.

It is plain that a process is once again afoot to raise anti-India hysteria in Sri Lanka. An obligation is cast on the Sri Lankan government to ensure that incendiary speculation of the above kind is defeated and India-Sri Lanka relations are prevented from being in any way harmed. Proactive measures are needed by the Sri Lankan government and well meaning quarters to ensure that public discourse in such matters have a factual and rational basis. ‘Knowledge gaps’ could prove hazardous.

Meanwhile, there could be no doubt that Sri Lanka’s sovereignty was violated by the US because the sinking of the Iranian vessel took place in Sri Lanka’s Exclusive Economic Zone. While there is no international decrying of the incident, and this is to be regretted, Sri Lanka’s helplessness and small player status would enable the US to ‘get away with it’.

Could anything be done by the international community to hold the US to account over the act of lawlessness in question? None is the answer at present. This is because in the current ‘Global Disorder’ major powers could commit the gravest international irregularities with impunity. As the threadbare cliché declares, ‘Might is Right’….. or so it seems.

Unfortunately, the UN could only merely verbally denounce any violations of International Law by the world’s foremost powers. It cannot use countervailing force against violators of the law, for example, on account of the divided nature of the UN Security Council, whose permanent members have shown incapability of seeing eye-to-eye on grave matters relating to International Law and order over the decades.

The foregoing considerations could force the conclusion on uncritical sections that Political Realism or Realpolitik has won out in the end. A basic premise of the school of thought known as Political Realism is that power or force wielded by states and international actors determine the shape, direction and substance of international relations. This school stands in marked contrast to political idealists who essentially proclaim that moral norms and values determine the nature of local and international politics.

While, British political scientist Thomas Hobbes, for instance, was a proponent of Political Realism, political idealism has its roots in the teachings of Socrates, Plato and latterly Friedrich Hegel of Germany, to name just few such notables.

On the face of it, therefore, there is no getting way from the conclusion that coercive force is the deciding factor in international politics. If this were not so, US President Donald Trump in collaboration with Israeli Rightist Premier Benjamin Natanyahu could not have wielded the ‘big stick’, so to speak, on Iran, killed its Supreme Head of State, terrorized the Iranian public and gone ‘scot-free’. That is, currently, the US’ impunity seems to be limitless.

Moreover, the evidence is that the Western bloc is reuniting in the face of Iran’s threats to stymie the flow of oil from West Asia to the rest of the world. The recent G7 summit witnessed a coming together of the foremost powers of the global North to ensure that the West does not suffer grave negative consequences from any future blocking of western oil supplies.

Meanwhile, Israel is having a ‘free run’ of the Middle East, so to speak, picking out perceived adversarial powers, such as Lebanon, and militarily neutralizing them; once again with impunity. On the other hand, Iran has been bringing under assault, with no questions asked, Gulf states that are seen as allying with the US and Israel. West Asia is facing a compounded crisis and International Law seems to be helplessly silent.

Wittingly or unwittingly, matters at the heart of International Law and peace are being obfuscated by some pro-Trump administration commentators meanwhile. For example, retired US Navy Captain Brent Sadler has cited Article 51 of the UN Charter, which provides for the right to self or collective self-defence of UN member states in the face of armed attacks, as justifying the US sinking of the Iranian vessel (See page 2 of The Island of March 10, 2026). But the Article makes it clear that such measures could be resorted to by UN members only ‘ if an armed attack occurs’ against them and under no other circumstances. But no such thing happened in the incident in question and the US acted under a sheer threat perception.

Clearly, the US has violated the Article through its action and has once again demonstrated its tendency to arbitrarily use military might. The general drift of Sadler’s thinking is that in the face of pressing national priorities, obligations of a state under International Law could be side-stepped. This is a sure recipe for international anarchy because in such a policy environment states could pursue their national interests, irrespective of their merits, disregarding in the process their obligations towards the international community.

Moreover, Article 51 repeatedly reiterates the authority of the UN Security Council and the obligation of those states that act in self-defence to report to the Council and be guided by it. Sadler, therefore, could be said to have cited the Article very selectively, whereas, right along member states’ commitments to the UNSC are stressed.

However, it is beyond doubt that international anarchy has strengthened its grip over the world. While the US set destabilizing precedents after the crumbling of the Cold War that paved the way for the current anarchic situation, Russia further aggravated these degenerative trends through its invasion of Ukraine. Stepping back from anarchy has thus emerged as the prime challenge for the world community.

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