Indicate the valid reason regardless of change. Substantive reason is required for significant change this period against same period a year ago. If weather or climate is attributed, ask for the impact or response of the crop to weather or climate and indicate the date of occurrence and the stage of growth of the crop referred to. Pest and diseases, typhoon, programs implemented and the like should be identified.
For significant difference in yield against the series or parameters, ask for a valid reason. Assess the appropriateness of the reason given.
This explains the reason for change this year against same period last year.
These are the factors that affect production which may include weather, farm practices, programs implemented affecting agriculture,prices, market situation, seasonality, technology, etc.
Source of information
The farmer-respondents are the source of information.