Basically, I need to use two of the following sensors:
Connect them to an Arduino MKR GSM 1400 in order to send the collected data to a cloud service.
I've obtained two modules like these (because they seemed necessary in tutorial videos):
My question is, is it possible? At the moment, I can't find an answer, and I would like to know if what I have is sufficient or if, on the other hand, I need to make some changes.
I apologize if I'm not very specific, but I'm just starting with this.
Why not actually identify the module so we don't have to guess as to what it is.
The Arduino in question has one UART, so with an RS-485 adapter, you can connect to the soil sensor. Get one working before you go to the complexity of have multiple serial devices on one serial data line.
Just be aware that the data those "sensors" output is just something random. They're not measuring NPK because it's just a scam.
You're like the second just today posting about it here 
So sad.
Return the sensor and claim back your money, it's the best you can do. It's so bad they didn't even straighten the pins for the image!
Sorry about that, yeah, I'm able to connect the first one using Serial1 object, but the problem comes when adding the second one as I don't have any idea how to do it, I've got one more RS485 adapter, not sure if I can connect it to Arduino MKR GSM 1400 if it's already using the Serial1 ports
Hola amigo.
Si se puede. pero debe de colocar un modulo RS485 en cada sensor, y conectalos los cables A y B en paralelo. tambien al arduino que sera el maestro de esa red de comunicacion, debes de colocarle un modulo RS485.
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