Cog kev loj hlob regulator yog cov khoom ntawm organic synthesis, microanalysis, cog physiology thiab biochemistry, niaj hnub kev ua liaj ua teb, hav zoov, horticulture thiab cultivation thiab lwm yam scientific thiab technological kev loj hlob. Txij xyoo 1920 mus txog xyoo 1930, nws tau pom tias cov kab mob ntawm cov nroj tsuag ntuj tsim cov tshuaj hormones, xws li ethylene, 3-indoleacetic acid thiab gibberellin, tuaj yeem tswj kev loj hlob thiab kev loj hlob ntawm cov nroj tsuag. Nyob rau xyoo 1940, txoj kev tshawb fawb ntawm cov khoom siv hluavtaws-2, 4-D, aminoester (DA-6), clopramide, sodium nitrophenol, -naphthoacetic acid, thiab yutan tau tsim thiab maj mam siv los tsim. ib qeb ntawm tshuaj tua kab. Nyob rau hauv 30 xyoo dhau los, ntau thiab ntau cov nroj tsuag kev loj hlob regulators tau synthesized. Txawm li cas los xij, vim qhov nyuaj ntawm kev siv thev naus laus zis, kev txhim kho ntawm cov nroj tsuag kev loj hlob regulators tsis yog sai npaum li cov tshuaj tua kab, fungicides thiab tshuaj tua kab mob, thiab lawv daim ntawv thov teev kuj me me. Tab sis los ntawm qhov pom ntawm kev ua liaj ua teb modernization, cog kev loj hlob regulator muaj peev xwm loj hlob zoo, nyob rau hauv lub xyoo 1980s tau accelerate tus qauv ntawm txoj kev loj hlob. Tuam Tshoj pib tsim thiab siv cov nroj tsuag kev loj hlob regulators nyob rau hauv 1950s.
Rau cov hom phiaj cov nroj tsuag, cog kev loj hlob regulators yog exogenous non-nutritive chemicals, uas feem ntau yuav kis tau mus rau qhov chaw ua hauj lwm nyob rau hauv cov nroj tsuag lub cev. Ntawm qhov tsis tshua muaj siab, lawv tuaj yeem txhawb lossis cuam tshuam qee qhov kev sib txuas ntawm cov txheej txheem ntawm lub neej, ua rau nws txhim kho kom tau raws li qhov xav tau ntawm tib neeg. Txhua tus cog kev loj hlob regulator muaj lub hom phiaj tshwj xeeb thiab nws daim ntawv thov yog technically demanding. Tsuas yog nyob rau hauv cov ntawv thov tshwj xeeb (xws li lwm yam sab nraud) tuaj yeem tsim cov teebmeem tshwj xeeb ntawm cov hom phiaj cog. Hloov cov concentration feem ntau ua rau muaj qhov sib txawv, xws li txhawb cov nyhuv ntawm cov concentration tsawg thiab inhibiting nyhuv ntawm siab concentration. Cog kev loj hlob regulators muaj ntau USES, nyob ntawm seb hom thiab hom nroj tsuag. Piv txwv li: tswj germination thiab dormancy; Txhawb kev rooting; Txhawb nqa cell elongation thiab faib; Kev tswj ntawm lateral buds los yog tillers; Tswj hom cog (luv thiab muaj zog tiv thaiv chaw nyob); Tswj flowering los yog poj niam txiv neej, induce seedless txiv hmab txiv ntoo; Sparse paj thiab sparse txiv hmab txiv ntoo, tswj cov txiv hmab txiv ntoo poob; Tswj cov duab los yog ripeness ntawm txiv hmab txiv ntoo; Txhim khu kev ntxhov siab (kab mob tiv thaiv, drought tsis kam, ntsev tsis kam, khov tsis kam); Txhim khu lub peev xwm nqus cov chiv; Nce qab zib los yog hloov acidity; Txhim kho tsw thiab xim; Txhawb txoj kev tso tawm ntawm latex lossis resin; Defoliation los yog urging (rau mechanical harvesting); Kev khaws cia, thiab lwm yam. Qee cov nroj tsuag kev loj hlob regulators yog tshuaj tua kab mob thaum siv nyob rau hauv high concentrations, thiab ib co herbicides muaj kev loj hlob txoj cai los ntawm tsawg concentrations.