Tomato

When its time to choose the right tomato fertilizer, the first thing you should keep in mind is the fact that the greatest absorption of nutrients in tomato occurs in the first 8 to 14 weeks of growth, and another peak takes place after the first fruit removal. Therefore, the plant requires high nitrogen application early in the growing season with supplemental applications after the fruit initiation stage. Improved N use efficiency and greater yields are achieved when N is applied under polyethylene mulches via a drip irrigation system. At least 50% of the total N should be applied as nitrate-nitrogen (NO3- ).

Calcium is also an essential ingredient of cell walls and plant structure. It is the key element responsible for the firmness of tomato fruits. It delays senescence in leaves, thereby prolonging leaf's productive life, and total amount of assimilates produced by the plans.

 

Haifa Group have various plant nutrition solutions and well designed tomato fertilizers that can  meet plant requirements.
See below recommendations, articles and research regarding tomatoes.