Deficiency is an uncommon problem in greenhouse tomatoes. Usually excess occurs which results in poor fruit set and increased susceptibility to disease and insect attack. Maintaining the nitrogen level at the lower end of the sufficiency scale is desirable. When N is high, no more N fertilizer should be applied and growth media should be leached to remove excess N if possible. For hydroponic solutions, reduce the N concentration in the nutrient solution.

Deficiency not likely to occur. Normally with a good fertility program, adequate P is supplied.

Deficiency is not likely to occur with a good fertility program. Frequently K levels may be too high for best cation balance with Ca and Mg. In such cases, no more K fertilizer should be applied and the soil media leached to remove excess K. For hydroponic solutions, reduce the K concentration in the nutrient solution.

Deficiency is a common problem in greenhouse tomatoes. When the growth media is soil, it should be well limed. For artificial mixes, applications of calcium sulfate (gypsum) may be needed to provide the Ca essential to prevent the physiological disease known as blossom-end rot. The use of Ca (NO3)2 as a source of N is recommended. Foliar applications of Ca(NO3)2 or CaCl2 (1 pound in 100 gal. water) can provide some of the Ca needs when plants are deficient in Ca. For hydroponic solutions, special additions need to be made to insure an adequate Ca supply.

Deficiency is a common problem usually due to inadequate Mg in the growth media. When deficient, Mg may be soil applied at the rate of 5 pounds magnesium sulfate or equivalent per 1000 sq. ft. or foliar applied by dissolving 10 pounds magnesium sulfate in 100 gals of water. Foliar applications are only temporary treatments and soil additions of Mg are recommended to control the deficiency for the length of growing period. For hydroponic solutions, special additions need to be made to insure an adequate Mg supply.

Deficiency is not likely to occur. Manganese may be high, particularly on soils which have been steam sterilized.

Deficiency is not likely to occur. High Fe test results normally indicate soil or dust contamination. An accurate Fe determination can only be made with washed leaves.

Tomato has a high B requirement. Boron additions may be required to maintain the plant B level within the sufficiency range. Apply 1/2 pound borax per 1000 sq. ft. for soil and artificial mixes if B has not already been applied. Care must be taken to insure that excessive B is not applied.

Deficiency is not likely to occur.

Deficiency is not likely to occur.

High Al levels are not likely to occur unless associated with soil or dust contamination (Fe will also be high).