Which of the following problems will not be considered before installing irrigation equipment in a farm?

The problem that will not be considered before installing irrigation equipment in a farm is the build-up of pest and diseases. This is because the installation of irrigation equipment is solely for providing water to crops, and does not directly relate to the control of pests and diseases. The other options, on the other hand, are important considerations before installing irrigation equipment as they will impact the effectiveness and efficiency of the irrigation system. For instance, the cost of equipment and maintenance, source of power, availability of water, and concentration of salt in the water are all critical factors that need to be evaluated to ensure that the irrigation system is both functional and sustainable.