Effects of salinity and alkalinity on pansy and impatiens in three different growing media |
| |
Authors: | Jeff S. Kuehny Blanca Morales |
| |
Affiliation: | 1. Department of Horticulture , Louisiana State University, Agricultural Center , 137 Julian C. Miller Hall, Baton Rouge, LA, 70803–2120;2. Ball Seed Co. , 622 Town Road, West Chicago, IL, 60185–2698 |
| |
Abstract: | The quality of irrigation water used for greenhouse crop production can strongly influence plant growth. However, the effect on plant growth is probably a combination of water quality and the type of growing media used. To determine the effect of saline and alkaline irrigation water on plant growth and nutrition, pansy and impatiens were grown in peat, peat:pine bark, and pine bark media under standard greenhouse conditions. Salinity treatments of 0, 100 and OmgL‐1 NaCl: CaCl2 and alkalinity treatments of 0, 100, 200, 300, and 400 mg L‐1 NaHCO3 were applied at every irrigation. Salinity levels at 100 mg L‐1 and greater caused necrosis of leaf edges, upward curling of leaves, and reduced flower number for pansy. Treatment symptoms for impatiens were reduced growth, general chlorosis, and reduced flower number. These treatment symptoms increased in severity for plants grown in pine bark. Alkalinity levels at 200 mg L‐1 and greater caused decreased flower number, necrosis of leaf edges, and downward cupping of leaves of pansy. Treatments symptoms of impatiens were general chlorosis, water‐soaked appearance of leaves and leaf abscission. Elemental concentrations of sodium (Na+), chloride (Cl), calcium (Ca++), magnesium (Mg++), and potassium (K+) varied in media solution and tissue with symptom and treatment. |
| |
Keywords: | |
|
|