How To Sort Tab Format File Based on Length of Column K

Programmer Question

I have a spaced delimited tabular file that looks like this:

>NODE 28 length 23 cov 11.043478 ACATCCCGTTACGGTGAGCCGAAAGACCTTATGTATTTTGTGG
>NODE 32 length 21 cov 13.857142 ACAGATGTCATGAAGAGGGCATAGGCGTTATCCTTGACTGG
>NODE 33 length 28 cov 14.035714 TAGGCGTTATCCTTGACTGGGTTCCTGCCCACTTCCCGAAGGACGCAC

How can I use Unix sort to sort it by length of DNA sequence [ATCG]?

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