The latest Arizona agriculture update from the National Agricultural Statistics Service’s Phoenix, Ariz., field office:

• Field crops

The opening of bolls has occurred on 75 percent of the cotton acreage, behind last year’s 79 percent and the five-year average of 76 percent. Cotton conditions are fair to excellent, depending on the location.

Alfalfa harvest remains active on over three-quarters of Arizona’s acreage. Alfalfa conditions range from fair to excellent. Range and pasture conditions vary from mostly very poor to fair depending on the location.

• Vegetables, fruit, and specialty crops

Arizona growers shipped miscellaneous melons this week.

• Weather summary

Temperatures were mostly above normal across Arizona for the week ending Sept. 13, ranging from 1 degree above normal at Roll to 8 degrees above normal at the Grand Canyon.

The highest temperature was 110 degrees at Roll, and the lowest reading of 42 degrees occurred at Flagstaff and the Grand Canyon.

Precipitation was reported at 12 of the 22 stations. The Grand Canyon received .01 inches and Tucson received .7 inches of precipitation. Yuma is the only reporting station with above normal precipitation to date.