Thx 
350, wow, that must be an enormous tree!
I guess so, the tree is 80 years old. Here is the original article:
A die-hard mango lover living in a small town of Malihabad in Uttar Pradesh
has grown 300 varieties of mangoes on a single tree in his orchard.
Malihabad has a long tradition of producing delicious varieties of mangoes
and one of the famous varieties is known by the name of the town.
Some of the rarest varieties of mangoes, which have become extinct, are
still growing on a 'miracle mango tree'. Kallimullah Khan, who hails from
Malihabad wants to save these and many more varieties of mangoes for the
posterity. "These are extremely tasty mangoes. We cannot find these
everywhere. I am trying my level best to grow different types of mangoes,"
said Khan.
The original tree is nearly 80 years old. Khan has grafted and grown new
varieties of mangoes on it. Relentlessly working in his nursery, Khan's
passion for the fruit goes back to his childhood when he began experimenting
with mango saplings. Driven by zeal to preserve vanishing variety of
mangoes, Khan started his conservation effort by grafting seven to eight
varieties of mango stems.
The sight and smell of different varieties of 'King of fruits' on a single
tree is attracting many visitors to the mango grove. "This is the first time
in my 70 years of life that I am seeing something of this sort. I have never
seen anything like this," said Pandit Rameshwar Dayal, a visitor overwhelmed
by the sight. Malihabad is located in the mango belt in Uttar Pradesh where
90 per cent people are engaged in the profession of growing mangoes.
Mangoes from Malihabad are exported to various parts of the country and
abroad. The cost of the most famous variety of mangoes 'Dussehri' reaches Rs
200 rupees per quintal in the season. About 1,000 varieties of mangoes are
grown in India, in an area of 2.5 million hectares. Uttar Pradesh, Bihar,
Orissa, Assam, Maharashtra, Andhra Pradesh and Tamil Nadu are major
mango-growing states in India.
India is the world's biggest producer of this tropical fruit contributing to
59 per cent of total production, but its share in the world mango market is
less than 15 per cent.
It exports about 30,000 tonnes of mangoes every year to nearly 40 countries
including Britain, Kuwait, Saudi Arabia, Canada and now the Untied States.
Mangoes account for around 39 per cent of the total fruit exports from
India.
Source: dailyindia.com
