can vary significantly. Harvesting Traditional harvesting of opium poppies to produce opiates involved the labor-intensive work of making shallow cuts in the immature fruits (seed pods) so that the latex would leak out and dry, then returning the following day to scrape off the dry latex, known as raw opium. Harvesting of poppy straw is an alternative, largely mechanized method. The plants are allowed to mature fully, then a machine is used to harvest the entire field. The ripe poppy seeds are separated out by threshing and winnowing, and the remainder is poppy straw. Poppy straw usually consists of only the above ground parts of the plant, but the roots may be harvested as well. Some producers mow the plants high, so that the harvest consists almost entirely of the fruits (seed pods), omitting the stalks, leaves, and roots. Poppy straw is then processed in a manner similar to opium to extract opiates and other alkaloids (see Morphine). Avoiding the labor-intensive harvesting of opium by hand was the topic of research for almost 100 years. This research was of notable interest in those countries where opium poppy was an important oilseed crop but due to high labor costs the harvesting of opium was not economic. What was needed was a process that enabled commercial extraction of opiates from opium poppies directly rather than from (comparatively pure) opium. By the 1940s, commercial production of morphine from poppy straw had spread from Hungary to Poland and finally most countries where poppies are grown on a large scale primarily for their seeds. By 1950, about 10% of the poppy seed harvest of those countries was also yielding morphine. Based on average yields and the reported production of poppy seed in 9 European countries, the potential production of morphine from those crops was estimated to be . However, in 1950 the actual production of morphine from poppy straw was reported to be . As of 1950, the average annual yield per hectare was estimated to be poppy seed and poppy straw (dry capsule chaff), which in turn was estimated to yield about of morphine (in good years). Processing The first commercial process by which opiates are extracted from poppy straw was invented in Hungary by János Kabay. This process, known as the "poppy straw method", remains in use today. Kabay applied his new process initially to fields of opium poppies between the stages of