Greenhouse crop irrigation can be improved by using different methods to determine when and how much to water plants. Traditional methods rely on soil or climate monitoring, but new plant-based techniques are being developed. These methods help growers decide how often and how much to water their crops, depending on the type of greenhouse system they use. Automatic irrigation systems can also help with this process. Overall, there is a need for further development of advanced systems like neural networks to optimize irrigation practices in greenhouse farming.