41. Most crops are produced seasonally with the total corn crop divided equally between seasonal and irrigated lands . 42. It was named after Vitis vinifera the Common Grape Vine, when grapes were planted here on irrigated land . 43. In 1867 the citizens of Boggsville dug the Tarbox Ditch from the Purgatoire to about of irrigated land . 44. Under this project, the Peruvian government plans to put 300, 000 acres of irrigated land up for sale. 45. Increasing salinity affects about 19 percent of irrigated land , which supplies 90 percent of the country's agricultural output. 46. In 1716, the Spanish offered irrigated lands for farmers to natives who agreed to abide by Spanish law. 47. Due to the large irrigation works in the area of irrigated land 1986 have reached 662 thousand hectares. 48. The government has tried with mixed success to encourage migration to newly irrigated land reclaimed from the desert. 49. Some researchers have estimated as much as one-fourth of the world's irrigated land is threatened by growing salt deposits. 50. A vast network of canals uses water from Lake Assad to irrigate lands on both sides of the Euphrates.