Precautions of applying NAA and other plant growth regulators

Sep 10 05:46 2013 David Yvon Print This Article

Plant growth regulators are synthetic organic compounds, with the function of promoting, inhibiting, or in other forms changing plant growth process. 

Although they are trace substances,Guest Posting but playing a significant effect. However, if they are improper used, the result is opposite, proper use growth regulators is the guarantee of full playing its functions.


Different species, varieties have different sensitivities to plant growth regulators, which should be the bases to choose different plant growth regulator and use concentration. For example: Apricot was not sensitive on paclobutrazol, the dosage should be increased. Growth regulators work in plant growth and development, be sure to use in the proper time, too early or too late can not achieve the desired effect. For example: naphthalene acetic acid used in young fruit period was playing the thinning effect, while used before picking fruit can prevent preharvest fruit dropping. Applications must be in the appropriate period, taking care to use the time, usually better to use before 10:00 in sunny windless day, the raining day should not use.


Plant growth regulator with strong activity, it should be chose the appropriate concentration while used, concentration too low or too high will have the opposite effect. For example: 24-D at low concentrations can promote the growth, parthenocarpy, in high concentrations can kill the plant. Also it should choose a suitable dosage form, usually the sprayed using liquid, soil using powder. According to the pathway of plant growth regulator entering into plant to choose using method, for example: paclobutrazol absorbed through the roots, can be applied into the soil, daminozide in the soil is stable, have long residual life, easily enter from the leaf, can be used spray pattern. According to the real problem decide the treatment site. For example: use 24-D anti-shattering, it is necessary to coat the drug on flowers to inhibit the formation of abscission layer, if use 24-D treating leaves then will cause damage. Another example is using naphthalene acetic acid or ethephon stimulate pineapple flowering, can be poured liquid into the tubular leaf to directly stimulate inflorescence differentiation, rather than soil watering or spraying.


According to the plant reactions decide the used number, generally one time, but if the result is bad, it is necessary to repeat using, very sensitive to the reaction can be used many times with a small amount. For example: with daminozide control apple saplings flourishing and flower is necessary to use 2-3 times once every 10 days. The doses should be controlled, such as liquid spray as wet for the degree. Make a variety of agents used in conjunction. Sometimes the production need to solve several problems at the same time, can be used in conjunction. To those can not react each others drugs can be mixed, to play the advantages and avoid weaknesses. For example: in order to early the pear supply period, while use the ethylene ripening, in order to avoid dropping, can be mixed with the naphthalene acetic acid. However, some agents, such as daminozide should not be mixed with other alkaline agents, or will affect the results.


Many plant growth regulators themselves are not very stable, such as indole acetic see light decomposition, ethychlozate loose effect when meet alkali and acids, naphthylacetate have volatility, must be properly stored according to their physical and chemical properties, or will reduce the efficacy. Note that various agricultural technologies complement each other. Growth regulators are only worked in one part of plant growth and development, not a substitute for fertilizers, pesticides and other agricultural measures, to make agricultural production application obtain the desired results, be sure to meet other agricultural technical measures. For example: with naphthalene acetic acid, IAA treated cuttings to promote rooting, it must maintain certain humidity and temperature within the seedbed, otherwise rooting is difficult guaranteed. In short, the application of growth regulators must be "positive and prudent", take various factors into account, in order to achieve the goals.


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