I heard a gardening expert say this today.

Problems:
1. The speaker misused the pronoun “on”.
2. The speaker misused the verb “need”.

Explanation:
I was listening this morning to a talk-radio program about gardening.

A caller asked the host about a topic.

The host responded with “You need to do a little bit more reading on it.”

The phrase “read on” is correct in sentences such as these:

• “I read on the website that he is divorced.”
• “I read on the subway the entire booklet.”
• “I read on the electrical panel that it was rated for only 120 volts.”

But “read on” is incorrect in a sentence such as “I read on the topic.”

Such a sentence requires the preposition “about”, not the preposition “on”.

The pronoun “it” in the statement made by the host to the caller referred to a topic.

So “reading on it” is incorrect, and the host should have used “reading about it” instead.

I believe that the use of “on” in place of “about” is consistent with my “Devolution toward Simpler” linguistic hypothesis.

It is simpler to say or write the one-syllable, two-letter “on” than it is to say or write the two-syllable, five-letter “about”.

The second problem was that the talk-show host used the verb “need” where another verb was required.

There are very few actions that humans need to take because there are very few things that humans need.

The verb “should” is the correction for “need to do” in the statement.

The avoidance of “should” in favor of “need to” in American English has become a common blunder.

My impression is that this blunder originated in the popular psychology of the 1960s, when the focus was on needs and when many started to say the catch-phrase “Don’t should on me!”

Solution:
“You should do a little bit more reading about it.”