Managing key nutrients in greenhouse tomato production

Added on 27 June 2023

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Managing key nutrients in greenhouse tomato production

A timely adequate supply of nutrients and water, in addition to proper management of the environment, can help sustain fruit production of greenhouse tomatoes. The specific nutrient requirements for the crop are related to the developmental stage of the plant and seasonal conditions. A tomato fertilizer program must be adjusted for three production stages: 1) transplant to four to six leaves, 2) normal feed, and (3) heavy fruiting.

At all times, the crop requires a complete nutrient solution. However, different proportions of potassium (K) and nitrogen (N) will determine if the crop grows vegetatively or forms flowers and fruit. In a recent e-GRO alert, Rosa Raudales of the University of Connecticut outlines how to adjust nitrogen and potassium throughout the production cycle.

The amount and form of nitrogen (N) provided to the crop from nutrient solutions is a tool that can be used to steer vegetative growth into a desired direction. As with all essential elements, insufficient or excessive amounts of total N will reduce yields.

To promote vegetative growth at any time, increase the nitrogen in the solution, especially the ammonium form. Typically keep ammonium at 10% of the total N or less. These levels can be higher but only for a very brief time to promote vegetative growth.