Agriculture

A combine harvester is a large machine that harvests grains such as wheat, oats and barley. The combine not only removes the grain heads from the stalks, but it also separates the individual grains themselves from the heads.
The combine harvester was invented in the United States in 1834, but a commercial version was invented in Australia in 1885.

A farm is a large area owned by a farmer. On a farm, animals and crops are grown on a big scale. A farmer may have hundreds of acres of wheat and thousands of sheep or cows. Farms are where food is grown for all the people who live in cities all over the world.
Farms can have many crops or just one or two. A farmer might have an apple farm, or a chicken farm instead of having lots of different things.

Fertilizer is a mixture of all the different chemicals that plants need to grow. Fertilizer's main components are nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur.

You harvest a crop when it is ripe by picking off all the ripe fruit, grain or leaves.
The name given to a large amount of a crop that you have just harvested is also called a harvest.

A paddock is a large open space, surrounded by a fence, that is used for keeping animals such as horses, cows and sheep in.

Reap means to gather a crop at harvest time. It can also mean receiving the results of your actions.

The word comes from Old English and was first used for cutting and collecting grain from fields. Over time it also came to describe gaining results, rewards, or consequences.

A tractor is a big vehicle usually driven by farmers. Tractors are used to pull ploughs and harvesters, and for pulling wagons full of hay or other loads. Tractors can be used for pulling other vehicles out of mud if they get stuck.
Tractors are designed to run on mud and dirt not smooth roads, which is why their back wheels are so big and have tyres with such deep tread.