What are two ways in which farmers increased the output from their land?

- fertilizers

- high quality seeding material

Explanation:

The farmers have been gradually increasing their production over the years, and there has been multiple reasons for this. One of those reasons is the implementation of fertilizers. The fertilizers give the plants much more nutrition, so they grow bigger, stronger, and produce more. Another important thing is the usage of high quality seeding material. Unlike in the past, in more recent times, the material used for seeding has been very well sorted out, and the seeds of the highest quality are provided to the farmers. This basically means that the farmers are getting seeds for plants that will be of great quality, with both more quality and quantity in their products.

d) a constitutional amendment