Automated watering system for orchard

Unless you want the challenge and satisfaction of doing it yourself, why wouldn’t you get an existing product like one made by Toro?

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You’ve answered your own question.

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Here is an Automatic plant watering system using Arduino UNO:

The same thing can be implemented using a Raspberry Pi Pico. Like the Pico plant waterer:

For turning on two hours twice a week, you can configure an in-built timer or interface an RTC.