Rashi on Deuteronomy 11:15/רש"י על דברים י״א:ט״ו

1ונתתי עשב בשדך AND I WILL GIVE GRASS IN THY FIELD [FOR THY CATTLE] in thy field: so that you will not need to lead them to distant pasture grounds. Another explanation: it means that you will be able to cut your grain all the rainy season and cast it before thy cattle as fodder, and if you withdraw your hand from it (stop doing this) only thirty days before the harvest, it will not give you less of its corn than if you had not fed your cattle with it (as is implied by ואכלת ושבעת, you will eat to the full) (Sifrei Devarim 43:2).

2ואכלת ושבעת AND THOU SHALT EAT AND BE SATISFIED — This is quite another (a separate) blessing; it means that a blessing will be on the bread within the stomach (see Rashi on Leviticus 25:19). השמרו לכם