PURPOSE: To mitigate or avoid the development of chlorosis without impairing inherent plant growth regulatory effects by continuous combined use, either simultaneously or near simultaneously, of a phosphoric acid with 2-chloroethyl trimethylammonium chloride (a plant growth regulator).
CONSTITUTION: A continuous combined use of (A) a phosphoric acid (pref. orthophosphoric acid, metaphosphoric acid, pyrophosphoric acid or salt thereof), either simultaneously or near simultaneously, with (B) 2-chloroethyl trimethylammonium chloride as an established plant growth regulator is made at an amount of 1-50g/a of the component A (in terms of P2O5) and at the molar ratio A/B=(1:10)-(10:1) [pref. (1:3)-(3:1)]. Thereby, the component B can be used without impairing the effects inherent in the component B with the development of the chemical injury (chlorosis) potential to crop mitigated or avoided, even under such meteorological conditions as to liable to develop chlorosis. Furthermore, improvement of stability of the above-mentioned effects due to the increase in dosage of the component A and/or growth-promotive effects due to the fertilizer response of the phosphoric acid, etc., will be expected.
MORITA TETSUO
MATSUDA YASUHIKO
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