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

• Field crops

Opening of bolls has occurred on 82 percent of the cotton acreage, below last year’s 89 percent, and behind the five-year average of 85 percent.

Cotton harvesting is underway at 17 percent complete, same as last year at 17 percent, but ahead of the five-year average of 10 percent. Cotton conditions are mostly good to excellent.

Alfalfa harvest remains active on over three-quarters of the state’s acreage. Alfalfa conditions range from poor to excellent depending on 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. 20 ranging from 3 degrees below normal at Roll to 6 degrees above normal at Grand Canyon. The highest temperature of the week was 106 degrees at Roll and the lowest reading of 32 degrees occurred at Grand Canyon.

Precipitation was reported at 10 of the 22 stations. Willcox received the most at 0.5 inches of precipitation. Flagstaff and Paloma received the least with 0.02 inches. Yuma is the only reporting station with above normal precipitation to date.