1)
Why does it say "Hovishu Ikarim"?
1.
Rashi: Those who conduct the plow were ashamed.
2.
Radak: This is a command, and also Heililu (5). It is proper that they be ashamed, for their deeds and toil in the field were for nothing. Ikarim are farmers.
2)
Who are "Kormim"?
1.
Radak: They are those who tend vineyards [Malbim - and olive orchards].
3)
Why does it say "Al Chitah v'Al Se'orah"?
1.
Rashi: This refers to the Ikarim (farmers).
4)
Why does it add "Avad Katzir Sadeh"?
1.
Malbim (10): This refers to other grains and legumes that grow in a field.