In an ecosystem which would have a larger population, producers or primary consumers

The answer would be producers.

The fact that there are primary consumers today, you would know that producers make up the bigger population. If it were smaller, the primary consumers would have eaten them all up and eventually would die out because they would have no more food source. This would be bad for all higher level consumers. 

Answer(a); // soil salinization and waterlogging;

Cpopulation density