it helped them to grow better crops
They have to irrigate their fields
Irrigate/irrigation.
To irrigate crops
irragation canals
To irrigate crops
The salt which is present in sea water will kill most crops.
The floodwaters of the Nile and irrigation canals.
Irrigate is already a verb because it is an action.Other verbs are irrigates, irrigating and irrigated, depending on tense.For example, here are some sentences:"We will irrigate the crops today"."They irrigate the fields"."We need to do some irrigating"."They irrigated the farmland"
Irrigate [water] their land to grow crops.
Not enough jobs to support everybodyLess crops (Not enough land to produce crops)Not enough water to irrigate land used for crops
They extracted it from rivers and ground wells and used canals to irrigate crops.