Maize is protandrous in nature but it has been noticed that silking occurs earlier than taselling in some cases.
Silking interval is less in hybrids and more in inbreds and this varies with stress conditions like waterlogging, high temperature etc. During stress period, ASI increases which reduces the seed setting to a greater extent.
I fully agree with the answer provided by Varsha. In most cases, naturally, silking occurs earlier (normally 1-3 days) than the tassels and become receptive by the time tassels start shedding pollens. The duration varies mainly with hybrid/variety and water and temperature stress.
this phenomenum occurs in inbreds , and very rare in hybrids, originally it is genetic, and seldom to be influenced by growth factors. The time early is on average of 2 to 3 days,
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