Why does it say "Ki Shachachat"?
Radak: He addresses Keneses Yisrael. Why did all this happen to you? Even your strong cities are abandoned! It is because you abandoned the Rock of your strength and the G-d of your salvation. He was a tower of strength for you, and saved you from the enemy, and you forgot Him, and did not remember Him on the day of your affliction. Therefore, He left you in the hand of the enemy.
Why is He called "Elokei Yish'ech"?
Malbim: He saved you from early days.
Why does it say "Lo Zachart"? It already says "Ki Shachachat"!
Malbim: You cannot forget the Rock of your strength; He is in front of your eyes. However, you did not want to remember Him and put Him to heart.
Why does it say "Al Ken Tit'i"?
Rashi: Therefore, when I planted you, from the beginning you 1 planted a beautiful planting - 12 Bnei Yakov, and when you raised branches, you put improper seed, like strange branches that are not vines, but resemble vines.
Radak: This happened to you because initially you planted beautiful saplings, and now you seed foreign branches. The Nimshal is, you reversed Avodas ha'Kel ha'Gadol for Avodah of a foreign god.
We rely on texts of Rashi that say 'Natata'. (PF)
What is the meaning of "[u'Zmoras Zar] Tizra'enu"?
Rashi #1: You put your seed in that planting.
Rashi #2: You married Nochrim, and they became mixed with you.
Radak: Refer to 17:10:4:2.
Malbim: This is a Mashal - one had a beautiful sapling, and grafted onto it a branch from another inferior species. It ruins the nice species and its beauty. The Nimshal is, they have a strong Rock, and they are Kadosh seed, Bnei Kel Chai, and they sought help from other nations and gods.
Why does it say "Tit'i" and "Tizra'enu"?
Radak (11): Vegetation sprouts in two ways - via planting and seeding. Sometimes the verse uses the feminine for the assembly, and sometimes it uses the masculine for the nation.
