If a person eats rice mixed with vegetables, the Beracha he recites over the mixture is determined by the majority component. If the rice constitutes the majority, then he recites the Beracha of Mezonot, which covers both the rice and the vegetables; if the vegetables are the majority, then one recites Ha'adama, which covers even the rice.
However, this applies only if the rice and vegetables are mixed together. If they are eaten separately, one must recite Mezonot over the rice and Ha'adama over the vegetables, even if both might be in his mouth simultaneously. The concept of the Beracha over the majority food covering the minority food applies only to mixtures; when eating foods separately, one must recite a Beracha over each food independently.
This principle affects the recitation of Berachot when one eats a fruit salad containing both fruits that require Ha'etz and those that warrant Ha'adama. If the fruits are sliced into fine pieces, such that a spoonful will likely contain fruits requiring different Berachot, then one recites only the Beracha of the majority component. Thus, for example, if the fruit salad consists mostly of fruits requiring Ha'etz, then he recites this Beracha and it covers even the fruits that independently would require Ha'adama.
However, if the fruits are sliced into large pieces, such that a spoonful would contain only a single piece, one must recite Ha'etz over those fruits normally requiring Ha'etz, and Ha'adama over the fruits that would ordinarily require that Beracha. The same would apply if one eats the fruit salad with a fork, even if the fruit is sliced very thin. Since he necessarily eats each piece of fruit independently, he must recite the appropriate Beracha over both types of fruit.
Summary: If one eats two foods mixed together, such as rice mixed with vegetables, he recites only the Beracha of the majority food, whereas foods eaten separately require independent Berachot. Therefore, if one eats fruit salad consisting of thinly sliced pieces of fruit from species that require different Berachot, he recites only the Beracha over the majority fruit. If, however, he eats the salad with a fork, or if the fruit is sliced into large pieces such that a spoonful would consist of only a single piece, he must recite both Berachot independently.
