Question: query about cracking of mango fruits.
Answer: cracking could be due to water deficits, or deficiencies of calcium or boron. extremes of temperature, humidity and rainfall could also contribute to the problem.

manure and fertilizer doses of mango: for bearing tree per plant/year- urea @ 730g, ssp @ 180g, mop @ 680g , dry cowdung @ 20-25 kg and apply borax @ 25-40g.