Abstract
Gibberellic acid (29 or 290 μM) injected into drip irrigation lines significantly stimulated internode elongation of dwarf peas, and the 290-μM soil treatment produced significantly taller plants than did the 29-μM treatment. GA3 uptake may limit GA-induced internode elongation when GA3 is applied to soil, in contrast to results obtained for hydroponically grown plants, where uptake initially appeared to exceed the rate of hormone metabolism (andersonet al.). It is likely that biodegradation or chemical inactivation limited the plant-availability of GA3 in the soil. Degradation of moderate GA3 concentrations in a moist, aerobic loamy fine sand was nearly complete within five days, indicating that the inefficiency of soil applications may outweight the benefits provided by reducing labor costs associated with foliar-spray applications.
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Anderson, S.J., Franco-Vizcaino, E. & Jarrell, W.M. Dwarf pea response to gibberellic acid applied to soil through a drip irrigation system, and gibberellic acid biodegradation in soil. Plant Soil 112, 289–292 (1988). https://doi.org/10.1007/BF02140008
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DOI: https://doi.org/10.1007/BF02140008