Certain diet and behavioral changes are thought to have a positive effect on increasing healthy sperm count (stands to reason that there would be some volume increase as well)... But if you're looking to increase your load, than I don't know of anything but good hydration and abstaining for a period of time to build up surplus.
To help improve sperm count avoid excessive use of alcohol, tobacco, or recreational drugs... Especially marijuana... But it's a four month process, as it takes almost three months for semen to form.... Here's a list of foods thought to be beneficial...
-Foods rich in zinc - lamb, turkey, barley, wheat, oysters beans, nuts, red meat, pumpkin seeds
-Vitamins C, E, B12 - for antioxidant properties and sperm production
-L-arginine, L-cartinine (amino acids) - spinach, seaweed (spirulina), poultry, sesame seeds, tuna, turkey, egg whites
-Foods with selenium - Brazil nuts, tuna, red meat, poultry, eggs, cottage cheese
-Lycopene - tomatoes, ketchup, pink grapefruit, guava
-Folate (Folic Acid) - asparagus, beets, broccoli, beans, citrus fruits, other "leafy green" vegetables
-Water - it's very important... Avoid frequent dehydration
Taking a daily multivitamin is also a good idea. What you're trying to do is provide your body with all the necessary building blocks for proper sperm development.. While at the same times eliminating detrimental substances.
