Effects of Ammonium and Nitrate Nutrition on Floral Initiation of Tomato Plants

There has been extensive work on the relationship of temperature, photoperiod and nitrogen supply to the time required to bring a plant from the vegetative to the reproductive phase. This investigation was designed to ascertain whether any differences existed between the time required for the initiation of the first floral primordia in tomato plants when treated with a nutrient solution containing all available nitrogen in the ammoniacal form as compared to a nutrient solution where all available nitrogen was in the nitrate form