Correct methods for using crop growth regulators
How are growth regulators used on crops? Here is an introduction. When using growth regulators, you can refer to the following methods: 1. Combine them with cultivation measures. Plant growth regulators are not nutrients; they can only regulate plant growth and development to a certain extent. They cannot replace the need for temperature, light, water, fertilizer, etc., nor can they replace...
How are growth regulators used on crops? Here is an introduction.
When using growth regulators, you can refer to the following methods:
1. Combine them with cultivation measures. Plant growth regulators are not nutrients; they can only regulate plant growth and development to a certain extent. They cannot replace the need for temperature, light, water, fertilizer, etc., nor can they replace normal plant metabolism, so normal cultivation measures are indispensable.
2. Select the correct agent and use it according to the symptoms. Plant growth regulators include inhibitory types and promotive types, and each agent has different characteristics and physiological functions. Therefore, before use, you must fully understand the effects of various agents, and choose the appropriate agent according to the purpose of application and the expected results.
3. Correctly master the concentration and dosage used. Rice is relatively sensitive to hormone-type agents. Within the appropriate concentration and dosage range, the expected results can be achieved. If the concentration is low or the dosage is small, the effect will not be obvious; if the concentration and dosage exceed the appropriate range, they will have the opposite effect. Rice may even be harmed and killed.
4. Master the application period, frequency and site well. The same growth agent applied at different growth stages of the crop will produce different effects. For example, applying gibberellin before rice tillering promotes tillering, while applying it at the peak or late stage of tillering inhibits tillering. Practice has proved that for hormone-type agents, generally applying small doses multiple times is more effective than applying a large dose once, and in some cases application at a single growth stage is less effective than application at multiple stages.
5. Pay attention to the influence of pH. For example, ethephon does not release ethylene below pH 3 and is stable, while it begins to release ethylene above pH 4.1, so it should not be mixed with alkaline agents during use. Different water qualities also have different pH. When preparing the solution, hard water (well water) should not be used, so as to avoid undissolved calcium salts and magnesium salts affecting the efficacy.
6. Apply alternately and mix correctly. Practice has proved that promotive-type and inhibitory-type plant growth agents, when applied alternately or mixed separately with chemical fertilizers and pesticides, can improve the effect as long as the combination is appropriate. If mixed application produces antagonism, they will offset each other and reduce the effect. Some hormone-type agents can be mixed with chemical fertilizers and pesticides, and some cannot. Most become ineffective when encountering alkaline fertilizers and pesticides and cannot be mixed.
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