How Do Types of Coffee Grown in Kenya Relate to Climate Change Impact on Assam Tea Gardens?
Assam is the largest tea-producing region on earth, supplying about one-fifth of global output and half of India's tea while employing roughly 1.2 million workers. Erratic rainfall and shifting temperatures are pressing the region. A study of 82 tea gardens from 2004 to 2013 found that short-term weather swings, more than long-term averages, drive year-to-year yield changes.
The wider picture includes drought in parts of Africa, heavy rain eroding Indian hillsides, and Himalayan glaciers melting at twice the rate seen before 2000. Producers can respond with shade trees, irrigation, and adjusted plucking schedules. Growers watching types of coffee grown in kenya face similar pressure, since both crops depend on stable rain and temperature.
Assam is the largest tea-producing region in the world, contributing one-fifth of global output and half of India's tea, and supporting around 1.2 million workers. However, disrupted rainfall and temperature patterns are putting this land under increasing pressure—drought in Africa, heavy rainfall erosion in India, and accelerating melting of Himalayan glaciers all sound alarms at the macro level. But what truly affects each tea leaf is often a more micro-level climate variable. A study based on 82 tea gardens spanning 2004 to 2013 reveals how short-term weather fluctuations directly influence yields. This article will walk you through these findings and what adaptive measures tea gardens can take. Front Street Coffee always pays attention to the long-term impact of climate change in producing regions on the flavor in the cup.
Disruptions to rainfall and temperature patterns are affecting the tea industry, and this impact is expected to intensify further. Drought in parts of Africa has escalated into a crisis—more than one million people in northern Kenya are facing food shortages. In India, heavy rains wash down hillsides, damaging tea trees; while in some farms in China, low-lying areas are covered in dust, making it difficult for sunlight to penetrate.
The Himalayas are known as Asia's water tower, and their glaciers have been melting at twice the rate since 2000 compared to the previous two decades.
The above is the "big picture" data at the macro level. But the micro-level picture at the local level is not clear enough: how exactly do these changes affect each specific farm? Which impacts are immediate, and which accumulate over the long term? What are the most critical climate variables? What can farmers themselves do, rather than relying solely on policymakers?
A study published in late 2016 happens to provide the answers. Through a decade of data collection, the study tracked crop yields in Assam in detail, with the paper titled "Observing the Impact of Climate on Tea Yields in Assam, India," published in the Journal of Applied Geography. It captured the structural dynamics of the relationship between climate and yields.
Assam remains the world's largest tea-growing region, accounting for one-fifth of global output and half of India's total production. Tea provides employment for 1.2 million workers. But the region is facing increasingly difficult circumstances, especially in improving tea quality to compete with major export rivals such as China, Kenya, and Sri Lanka. Since 2013, input costs have risen by 8% annually, while prices have grown by only 1% per year.
Clearly, climate change has brought many challenges to tea cultivation in Assam: 800 large plantations and over 100,000 smallholder farmers—the latter now contributing about half of Assam's output. Research that collects data at the business unit level is especially valuable. The data came from 82 tea gardens, covering monthly yields from 2004 to 2013, as well as daily temperature and precipitation records. Thus, the study adds a micro perspective beyond macro-level outcomes. Macro studies tend to address policy issues, while yield surveys are more closely linked to management surveys.
Macro analyses consistently show that long-term regional warming trends coincide with declining yields. Econometric models confirm that changes in monsoon seasonality are having lasting effects. The Assam study decomposed the data, pointing out that the main source of yield decline is short-term fluctuations in temperature and precipitation within a single month. On average, the main weather patterns throughout the year are: January is the coldest, the monsoon arrives in June, and precipitation is highest from June to September. The direct impact on yields comes from within a month, particularly when there are 5 consecutive days without precipitation.
The implication of this study for management is that priorities must focus on reducing tea trees' sensitivity to precipitation changes: accelerating the breeding of drought-resistant varieties; improving irrigation infrastructure (such as drip fertigation and manual field spraying); increasing the protection of tea trees by shade trees to retain moisture; and improving pruning methods. The study concludes that combining these good practices can deliver immediate and adaptive returns.
The above content is compiled by CoffeeHunters, a coffee news website.
