What does the term "windrow" refer to?

The term "windrow" specifically refers to a line of cut and piled brush or hay. This agricultural practice involves gathering cut vegetation into a long, narrow pile. Windrowing is an effective way to facilitate the drying process of hay or brush after cutting, as it allows for better exposure to sunlight and wind, which can speed up drying before collection. This method is particularly useful in managing crop residuals in fields and can impact the efficiency of harvesting operations.

The other options describe different agricultural concepts. The height of grass in a field pertains to crop management and growth assessments. A method of planting seeds generally involves various techniques such as broadcasting or drilling, which do not relate to the concept of windrowing. Lastly, a type of irrigation system used in agriculture refers to various systems designed solely for delivering water to crops, which again does not connect with the definition of windrow.