This photo from April 2013 shows a tool we use to measure the pH of irrigation water in the grove. This helps us maintain the quality of fertilizers and other products applied to the trees. I like this particular kit because it’s easy to use, and it’s accurate enough for our purposes. I check the pH several times a year, and it’s usually in the range of about pH 6.0 to 7.0. For testing soil pH, we collect samples using a special sampling technique, then send them to a lab. The gray card at the top of the photo is a tool used in photography to help correct the color of the image so that it is as accurate as possible.

• Aperture:ƒ/657957.4• Credit:17 14:23:46• Exposure bias:+1000000/2970854EV• Focal length:0.806451612903mm• ISO:80• Location:10/0° 3.7037037037E-6′ 0.0172173166261″ N 100000/0° 0.0123456790123′ 0.0192670208716″ W• Shutter speed:1/1s