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Spacecraft nadir point: 51.5° N, 34.2° E

Photo center point: 49.9° N, 31.4° E

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Nadir to Photo Center: Southwest

Spacecraft Altitude: 215 nautical miles (398km)
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Image Caption: Agricultural Marks the Landscape in Central Ukraine

While flying over eastern Europe, an astronaut aboard the International Space Station took this photograph of Kaniv Reservoir on the Dnieper River, approximately 72 kilometers (45 miles) south of Kiev, Ukraine. Neon green algae blooms, young forests that cover old crops, and variegated patches of agriculture - each of these unique features of the landscape are connected through history and its consequences.

In the early 1920s, a policy known as "collectivization" was adopted by the Soviet Union. For Ukrainians, the agricultural policy meant that most farming took place in kolkhozes (collective farms), with a large percentage of harvests being sent to urban centers. After the fall of the Soviet Union in 1991, land in Ukraine was divided into small sections among the rural population, with each plot representing a former kolkhoz farmer.

Today agriculture is still a major part of the Ukrainian economy, with more than 70 percent of the country's land area devoted to husbandry. Most of the agricultural plots are still used for growing crops, though some are fallow or abandoned and some overgrown with young forests. As a consequence of the pervasive agricultural land use, an abundance of fertilizer runs off into the nearby rivers and reservoirs, leading to phytoplankton (often algae) blooms. The algae seen here, and the nutrients they consume, also travel down the Dnieper River and its tributaries to the Black Sea, where larger phytoplankton blooms can occur.