It's may month and if you have planted guava tree it's time to put manure in it, but the best way to get better result is to apply manure based on the aging of guava plant or tree.

In this article I am going to tell you that the best way to give a proper amount of N:P:K in plant you can use farm yard manure. 

Why farm yard manure?

1. Organic in nature.
2. Improve soil's water holding capacity.
3. Supply almost all nutrient.
4. Improve soil structure.
5. Decrease soil temperature.
6. Increase the  moisture in soil.
7. Good soil tilth.
8. Good soil conditions.

Manure dose according to age of guava.

Age in years           dose/tree.

1-3.                          10-20 kg.

4-7.                          20-40kg.

7-10.                        40-50kg.

10>.                           50kg.

Time for applying dose of manure.

Farmyard manure should be applied in May. Half of the  inorganic fertilizers ( like urea, super phosphate and muriate of potash ) should be applied in May-June and the  remaining half in September-October.

If  there is shortage of farm yard manure in your area you can use organic products which supply these nutrient. 

Zinc deficiency in guava.

Symptoms

1. Leaves get shorten.
2. Branches get shorten.
3. Leaves show chlorosis or yellowing inbetween the veins.
4. Plant's branches get die, branches die back symtoms.

These deficiency can be cure by spraying solution of 1% zinc sulphate 

1% zinc sulphate.

Zinc deficiency is corrected by spraying the trees with 1% solution of zinc sulphate  (1 kg of zinc sulphate + 1/2 kg of unslaked lime in 100 litres of  water). Give 2 or 3 such sprays at fortnightly interval between June to September.

 Fruit Maturity and Harvesting

Guava fruit is climacteric in nature and should be picked when  it is mature but firm. When picked at this stage, it ripens to give  excellent taste and flavour. The fruits change their colour from  dark green to greenish yellow at maturity. The fruits should not  be allowed to over ripe on the trees as they deteriorate in quality  and are more liable to be damaged by birds. It is a common  practice that farmers retain a few leaves or small branches with  the fruit to make it attractive. But this practice rather leads to  higher moisture loss from the fruit and may injure the adjoining  fruits and aggravate spoilage.  

Post-Harvest Handling

Guava is highly perishable fruit and should be marketed  immediately after harvest. Harvested fruits are cleaned, graded  and packed preferably in CFB cartons of sizes ranging from 4-10kg. The guava fruits when picked at proper maturity can be kept at room temperature for one week in perforated polythene bags and for three weeks in CFB cartons in commercial cold storage at  0-3.3oC and RH of 85-90%. Guava cv. Shweta can be stored for  one week at ambient temperature (15-20oC) and for two weeks in cold storage at 6-8oC and 85-90% RH. Fruits of winter guava cv. Sardar harvested at physiological mature stage can be ripened  at 20oC in 72 hrs and these fruit can be kept for 48-72 hours at  ambient conditions in winter. Squash, nectar and leather can be  prepared from Punjab Kiran and Punjab Pink, coloured guava  varieties.