Mango browning leaves question

[wookieboogie]

Hello everyone, I have mango tree planted in 35L planter bag. This tree already planted in this bag for 1 month+ and suddenly there are some old leaves turning brown. What do you think can be the problem of this browning?
About location, I live in jakarta with high noon temp around 35°c, this tree receive full sunlight. Watered every morning, planted in well-drain soil (mix of compost, soil, rice husk)

 

[Anniekay]

It needs to be in afternoon shade at those temperatures, in a deep deep pot with compost and watered frequently. Grow bags lose moisture way too rapidly to be good for planting a tree that needs a lot of moisture. I would just scrap that one, it's pretty stressed and at a young age it will be less work to just start another from seed.