crop regulation in guava

 crop regulation in guava

article by swaroopa.v

Crop regulation is practised in guava to encourage particular season crop in order to get quality fruit with high commercial value. For example, in northern India, winter crop is preferred over rainy season crop because fruits produced in the rainy season are inferior in quality and fetches lower market price compared to the other. Likewise, in the Deccan region, only two desirable crops in a year are preferred and the third one is escaped.

The key principle of crop regulation is to force a tree for its rest and to produce abundant blooms and fruits during particular seasons.

Crop during the unwanted season is escaped by practising deblossoming; this can be achieved by induction of stress or using thinning and pruning techniques.

induction of water stress:

 induction of water stress by withholding irrigation after harvesting of winter crop in northern plains, results in the shedding of flowers and the trees goes to rest. June flowering is encouraged to get winter crop; for that, the basin of the tree is dug up, manured and irrigated in June. After about 20-25 days of fertigation, the tree put forth profuse flowering in July and fruiting is obtained in winter. Water stress can also be induced by practices like root exposure and root pruning.

Use of de-blossoming chemicals:

 some of the chemical compound or plant growth regulators have been very useful in thinning a crop in guava. Post-bloom application of NAA at 80- 100 ppm has been useful in reducing fruit set. This treatment can reduce more than 80 % of rainy season crop and increase flowering of the following winter crop. NAD at 50 ppm and 2, 4-D at 30 ppm are also effective for de-blossoming of summer flowers

Bahar treatment in guava:

it is also called flower regulation. It is recommended to take only one harvest of the fruit plants a year for better yield. This treatment is done to regulate flowering.

In this treatment, the irrigation is withheld 45 days prior to the flowering.

This facilitates the shedding of leaves.

  Spray Ethrel 2 to 2.5ml/lit of water for leaf shedding

The trees are then medium pruned 40-45 days after withholding irrigation.

The recommended doses of fertilizers are applied immediately after pruning and irrigation is resumed. This leads to flowering and fruiting.

Type	Flowering time	Harvesting	Remark
Ambe	Jan-feb	June-August	More flowering and high yield
Mrig	June-July	Nov- Jan	Fruit quality is not very good ,more prone to insect -pest and diseases
Hasta	sept- oct	Feb- April	High flowering, good fruit quality & colour.preferred for export.

Rejuvenation in Guava:-

The rejuvenation technology involves cutting of exhausted trees (showing marked decline in annual production) to the extent of 1.0 to 1.5 meter height above the ground level during May with the objective of facilitating of new shoots…..