Irrigation and wheat growth: an observational study

In a sample of farms, rainfall (including irrigation from sprinklers) and crop yield are measured.

Use the pop-up menu to show the temperature in each field. In the observational study,

In the experiment,

In the observational study, rain gauges are installed in a sample of farms. Rainfall (which includes irrigation from sprinklers) and crop yield are subsequently measured.

In the experiment, moisture is controlled using supplementary irrigation. In each of 8 farms, 3 fields are used, with irrigation topping up moisture to 2, 2.5 and 3 mm of rainfall per day.