What are five major inventions that improved agricultural output between 1750 and 1870?

One of the major inventions that improved agricultural output between 1750 and 1870 are:

- Cotton gin : Eli Whitney invents the cotton gin in 1793, which contributes to the success of cotton as a Southern cash crop.

- iron plow : Jethro Wood invented the iron plow with interchangeable parts in 1819

- Factory-made agricultural machinery (1840s) - this encouraged commercial farming

- chemical fertilizers were sold commercially (1849)

- Steam tractors are tried out