Duration of the Pre-Shemittah Blessing of the Produce

Introduction

Why Three Years?

The commandment of Shemittah, which prohibits sowing or harvesting fields for an entire year, is an extremely daunting one, especially for an almost completely agrarian based society.  Thus, Hashem, recognizing the legitimate concern of "What shall we eat", reassures us that, before the Sabbatical year, He will bless the crops so that they will sustain the nation for three years:

EN/HEע/E
(כ) וְכִי תֹאמְרוּ מַה נֹּאכַל בַּשָּׁנָה הַשְּׁבִיעִת הֵן לֹא נִזְרָע וְלֹא נֶאֱסֹף אֶת תְּבוּאָתֵנוּ. (כא) וְצִוִּיתִי אֶת בִּרְכָתִי לָכֶם בַּשָּׁנָה הַשִּׁשִּׁית וְעָשָׂת אֶת הַתְּבוּאָה לִשְׁלֹשׁ הַשָּׁנִים. (כב) וּזְרַעְתֶּם אֵת הַשָּׁנָה הַשְּׁמִינִת וַאֲכַלְתֶּם מִן הַתְּבוּאָה יָשָׁן עַד הַשָּׁנָה הַתְּשִׁיעִת עַד בּוֹא תְּבוּאָתָהּ תֹּאכְלוּ יָשָׁן.
(20) And if ye shall say: 'What shall we eat the seventh year? behold, we may not sow, nor gather in our increase';
(21) then I will command My blessing upon you in the sixth year, and it shall bring forth produce for the three years.
(22) And ye shall sow the eighth year, and eat of the produce, the old store; until the ninth year, until her produce come in, ye shall eat the old store.

This promise of a three year blessing, however, seems strange.  If farming is prohibited for only one year, should not a two year blessing1 have sufficed?  Why does Hashem speak of three years and to which years is He referring?  Finally, does the definite article in "לִשְׁלֹשׁ הַשָּׁנִים" ("for the three years") carry any special significance?

Additional Questions

The brief passage above raises several other questions as well:

The Context

The natural place for our verses would have seemed to be at the conclusion of the discussion of the Sabbatical year at the beginning of Vayikra 25:1-6.  However, the Torah waits to record our verses until after first introducing the Jubilee year and delineating the laws of land purchase which are dependent upon it in 25:7-17.  Moreover, in the verses immediately following our section (25:23-55), the Torah resumes the discussion of the Yovel dependent laws of buying and selling land and slaves.  As such, it is indeed perplexing why our verses interrupt the flow of the text rather than coming after the laws of Shemittah.  How should we understand this placement?  Is the Jubilee year somehow related to the concerns that Hashem is trying to allay in these verses?
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