[Avodah] planting during shmitta permitted

[Ben Waxman]

http://www.nrg.co.il/online/11/ART1/688/731.html

This article states that Rav Avraham Yosef, the head of the rabbinate 
shmitta committee, permitted planting (al y'dei goy) in some of the 
areas which were heavily damaged in last week's frost. If this land 
is under the heter mikhira (HM), why is a special heter needed? If 
the land is under the ozer beit din, is this throwing issurim out the 
window without even a HM to be somekh on?

Am I missing something here?

Ben