Cultivation of amra - Mangifera indica Linn.

amra :

Mangifera indica Linn.

Cultivation:

The mango seedling (or seedlings in the case of polyembryonic seeds) emerges in 2 weeks and grows rhythmically from the start: a flush brings out the new shoot which extends in about 1 month time, after which the buds remain quiescent for shorter or longer periods. In a mature tree many twigs produce no extension growth for a year or longer, but in saplings most twigs flush up to 4 times per year if there is enough moisture. Flushes occur more or less synchronously depending upon the climate; during a long wet season the synchronization is gradually weakened. Leaves can remain functional for several years. The tree roots to a considerable depth, enabling it to find the moisture necessary for flowering/flushing during the dry season.

Normally only the buds at the compressed shoot tip partake in extension growth and flowering. Vigour finds expression in shoots of larger size and in the leafing out of more - often up to 5 - lateral buds at the shoot tip. A seedling mango comes into bearing after 5-7 years, some terminal buds producing an inflorescence whereas other terminals extend a flush of shoots. With the onset of bearing, the number of flushes is reduced to 2 or 3, including the dry-season flush which coincides with flowering.

Studies of several mango cultivars have revealed biennial flowering at the twig level, which means that shoots emerging from twigs which have flowered are unlikely to flower in their turn, even where flowering did not result in fruiting. Also, shoots of the last flush before flowering are less likely to break into bloom than twigs of previous flushes which have gone through much longer quiescent periods. In many Indian cultivars these tendencies are so strong that prolific bloom or late flushing necessarily lead to failure of the following bloom, thus leading to biennial bearing. It remains to be shown whether or not similar extremes occur in South-East Asian cultivars.

The inflorescence can reach full bloom from the time of flower initiation in as little as 25-30 days. Considering that each flower is a transformed shoot, an inflorescence is essentially as complex as a sizeable tree; hence the rate of organogenesis leading to bloom is astounding. Presumably the preceding quiescent period somehow paves the way for this explosive floral development. The fruits also grow fast: they ripen after 3-4 months, some late cultivars after 5 months.

Pollination is largely effected by insects (flies, bees); wind pollination is not very effective. Stigmas remain receptive for a short period only, mainly during the night and morning. Cross-pollination is recommended but polyembryonic cultivars in particular are often planted without pollinators. Fruit set is rather poor and variable, and losses due to premature drop occur right up to the harvest. Hence only about 1 out of 1000 perfect flowers can be expected to yield a fruit.





Propogation:

Polyembryonic cultivars used to be propagated mainly from seed, but budding and grafting are now becoming the rule, as was already the case for monoembryonic cultivars. Rooting of cuttings and layers is possible but not done on a commercial scale.

To obtain uniform rootstocks, seedlings are raised from polyembryonic cultivars, e.g. "Madu" in Indonesia, "Kaew" in Thailand, and "Kensington" in Australia. Research programmes to identify suitable dwarfing rootstocks are showing promising results in India. Seeds lose their viability in a matter of weeks and are pre-germinated as soon as possible after extraction. They are placed on their sides, the dorsal (most prominently curved) edge upwards, to produce a straight stem and root. Germination can be hastened by removing the tough endocarp before sowing.

Grafting can be done at any rootstock age, the earliest moment being when the thinnest possible graftwood matches the girth of the rootstock (in about 8 weeks from sowing). The rootstock stem should be sufficiently woody and thick (pencil size) to support cuts for budding. There is no consensus about the best method: in Thailand inarching of bagged rootstocks in mother trees is preferred, in the Philippines wedge grafting, elsewhere often side veneer grafting or patch budding. High temperature (25-30°C), actively growing rootstocks and hardened scion wood are important ingredients for success.

Nursery work takes 1-2 years; trees are preferably planted early in the rainy season. In Thailand the recommended spacing ranges from 12-8 m × 12-8 m, that is 69-156 trees/ha. The closest spacing is on raised ridges in the Central Province where a high water table limits rooting depth and tree size.





Harvesting:

The fruit is picked by hand, either by climbing the tree or by using a picking bag with a cutting edge mounted on a bamboo pole. It is difficult to assess maturity from the appearance of the fruit. Mature-green fruit should have attained full size, the "cheeks" should be well-developed and the endocarp should have hardened. There are more objective standards for major cultivars based on degrees Brix, specific gravity and firmness, but the simplest guide is number of days from full bloom or fruit set as established under an ASEAN research project.


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