Look for ПЛА-1 and ПЛА-1А. Sorry, the abbreviation stands for Automatic Afforestation Device (Приспособление лесопосадочное автоматическое), designed at Institute of Forest in Homel. I worked there after university. At 6 km/hr and planting 2 saplings per meter it achieves 12 000 saplings /hr.