Effect of nitrogen form ratio on pansy growth and nutrition and the palatability to white-tailed deer
1999
Harris, C.E. | Simonne, E.H. | Eakes, D.J.
Pansies are one of the most popular annual bedding plants in the United States. Growth and uptake of essential nutrients as influenced by N-form ratio was evaluated in pansy as well as what role pansy nutrition plays in the protection of pansy against feeding damage by white-tailed deer provided by selected repellents. Plants were grown under three N-form ratios: 100:0,50:50, and 0:100 NO3:NH4. Dry weight was highest for pansy treated with 100:0 and lowest for plants treated with 0:100 NO3:NH4 Mean quality ratings were 4.07 for pansies grown with 100:0, 1.80 for pansies grown with 50:50, and 0.78 for pansies grown with 0:100. Potassium (K), magnesium (Mg), and manganese (Mn) content was lower in plants treated with 0:100 than in those treated with 100:0. Ammonium may have competed with these cations for uptake. Boron (B), copper (Cu), molybdenum (Mo), and aluiminum (Al) content was highest in plants treated with N-NH4. There was no significant difference shown in nutrient levels caused by repellent treatments. Feeding damage was shown to be affected by N-form ratio only on Day 3 of the study. Of the three repellent treatments [Deer and Rabbit Repellent (Thiram), Deer Away putrescent egg spray, and no spray], Thiram provided the greatest protection to pansies over the study period.
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