tailieunhanh - Crop Profile for Lettuce in Arizona

Raised beds are ideal for lettuce production and they help prevent damage from soil compaction and fl ooding. They also improve air fl ow around the from soil compaction and flooding The also impro e air flo aro nd the plants, resulting in reduced disease incidence. Plant populations range from 60 000 to 100 000 per hectare. Lettuce is regularly sown directly in the fi eld to a depth of 10 to 15 mm. The seedlings are later thinned out to the desired spacing and. | Crop Profile for Lettuce in Arizona Prepared February 2000 General Production Information Arizona ranks second in the country in head leaf and romaine lettuce production. Arizona accounts for and of national lettuce production respectively for these three crops. 1 From 1994 5 to 1997 8 an average of 53 275 acres of head lettuce have been grown. 17 574 000 hundredweight were produced at an average value of over 275 million dollars. 1 From the 1994 5 to 1997 8 an average of 5 075 acres of leaf lettuce have been grown. 1 585 hundredweight were produced at an average value of almost 53 million dollars. 1 From the 1994 5 to 1997 8 an average of 7 800 acres of romaine lettuce have been grown. 2 287 hundredweight were produced at an average value of over 49 million dollars. 1 1998 Arizona vegetable crop budgets estimate that land preparation and growing expenses range from to for an 18-30 head 47 pound carton of head lettuce. Total harvest and post-harvest costs are per carton. 2 Land preparation and growing expenses for leaf lettuce in Yuma county are estimated at for an 18-30 head 47 pound carton while total harvest and post-harvest costs are per carton. 2 Land preparation and growing expenses for romaine lettuce in Yuma county are estimated at for an 18-30 head 47 pound carton while total harvest and post-harvest costs are per carton. 2 Arizona head lettuce is shipped direct to the . retail market and to bulk lettuce processors. For the period between late December and early March Arizona provides as much as 85 of the head lettuce for the . market. 3 Production Regions Western head lettuce grown in Yuma and La Paz counties accounts for of the head lettuce grown in Arizona by acreage. Lettuce is primarily grown along the Colorado and Gila rivers at elevations less than 100 feet. Average temperatures are 87 degrees in the summer and 55 degrees in winter. Summer daily maximums average 104 degrees while winter .