E026: All plots receive at least 1.5cm/week of water in April, May and October and 2.5cm/week in June through September. If the plots receive this water from natural rainfall, then no supplemental watering is needed. When watering is needed, it is done using a system of hoses set up in the field. A black irrigation pipe, 3 inches in diameter, is hooked up to the pump. This extends out to the E026 area where the 3-inch hose is divided into two 2-inch hoses. One part goes toward the E026 (and E071) plots (the other toward E055, E069, E070). From this hose, several regular garden hoses are connected. Gardena Excellent Oscillating Sprinklers, model 6968, are attached to these hoses. These sprinklers are purchased at Sears and made at Gardena, Inc., 6031 Culligan Way, Minnetonka, MN 55345. Three or four hoses/sprinklers are used at one time. Any more than this reduces the water pressure enough so the sprinklers will not work. The sprinklers are moved in order to reach all of the plots.