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how old are the trees?they may need to be fertilized.
Fertigation and thinning? How big is your trees and do you prune your guavas?My trees size 3-6 feet, an many branching in there.I never prune my trees because i think its not the good time...How your opinion???http://businessdiary.com.ph/2325/guava-production-guide/http://gardening.stackexchange.com/questions/11222/does-it-matter-if-i-cull-the-flower-or-fruit-for-higher-fruit-qualityhttps://www.researchgate.net/publication/46030356_Studies_of_Physico-chemical_Changes_Due_to_Fruit_Thinning_in_Guava_Psidium_guajava_L