[en] The results of measurements of the total reaction cross sections for the target nuclei ⁴⁵Sc, ⁴⁸Ti, ⁵¹V and sup(52,53,54)Cr, induced by 13.6 MeV deuterons and 27.2 MeV alpha particles, using an improved transmission method with charge collection are reported. Experimental data for the isotone pair ⁵¹V-⁵²Cr and for chromium isotopes corroborate the existence of the isotopic-isotonic effects observed earlier for nuclides with A approximately 60. The deuteron-induced total reaction cross sections for ⁴⁸Ti and sup(52,54)Cr are well reproduced by optical-model calculations with parameters derived from elastic scattering angular distributions; ambiguity of parameters for these nuclei is reduced considerably. The total reaction cross sections corresponding to alpha particles are analysed in the quasiclassical approximation. It is shown that isotopic-isotonic effects are linked to a nuclear density diffuseness parameter. (author)