We recommend that researchers return to the original references cited in this paper and critically evaluate whether a method is appropriate for their intended use. Some critical evaluation has already occurred if the method was published in a refereed journal. However, additional research may be necessary before determining whether the method is appropriate for the situation in which it will be used. In many situations, on-farm trials minimize the need for Extension agent equipment resources and are an established and efficient way to conduct publishable research. Yield Measurements Yield is the most frequent parameter measured in agricultural field trials.
Direct harvest is the most accurate method of measuring yield.
However, unless plots are large enough to use farmer equipment, an agent must have the equipment for harvesting and weighing, or use indirect methods to estimate yield. Yield from small plots or subsampled yield from larger plots can be determined by directly harvesting plant material from a known area. A known area can be harvested within an inexpensive frame made of PVC or wood, or along a measured linear distance for row crops. A sickle mower or rechargeable or manual clippers can be used to harvest plant material from small plots. The tissue can then be weighed and yield calculated from the weight and harvest area.