Bunch weight (kg/vine) at harvest is a key part of any yield prediction program. One important goal of recording bunch weight each year is not to predict the yield that year, but to provide an average bunch weight to help with yield prediction in subsequent years. Careful collection and maintenance of bunch weight records from year to year is pivotal to improve yield estimation. Keeping good records will also give the you a better sense of the annual variation related to less favourable climatic conditions.
Sectormentor for Vines makes it easy to record the bunch weight from many different vines in a block each year and then determine an average bunch weight over time.