What did the egyptians build to increase their production of crops?

Irrigation systems
To make best use of the waters of the Nile river, the Egyptians developed systems of irrigation. Irrigation allowed the Egyptians to use the Nile's waters for a variety of purposes. Notably, irrigation granted them greater control over their agricultural practices. Flood waters were diverted away from certain areas, such as cities and gardens, to keep them from flooding. Irrigation was also used to provide drinking water to Egyptians. Despite the fact that irrigation was crucial to their agricultural success, there were no statewide regulations on water control. Rather, irrigation was the responsibility of local farmers. However, the earliest and most famous reference to irrigation in Egyptian archaeology has been found on the mace head of the Scorpion King, which has been roughly dated to about 3100 BC. The mace head depicts the king cutting into a ditch that is part of a grid of basin irrigation. The association of the high ranking king with irrigation highlights the importance of irrigation and agriculture to their society.