How to use paclobutrazol, a plant growth regulator, in lawn

In lawn management, in order to save the cost of mowing, in addition to mechanical mowing, plant growth regulators can also be used to control lawn growth. For example, when people use paclobutrazol and other plant growth regulators on the lawn, it can make the intercellular space of turfgrass plants become smaller and slower, the internodes smaller, the leaves thicker and the color darker, thus inhibiting its growth, so, how to use paclobutrazol reasonably? Paclobutrazol, also known as PP333, is a chemical that can delay the growth of plants in the form of light brown powder. it is used in lawn chemical regulation and has many advantages. It can not only effectively control the growth of turfgrass and achieve the purpose of reducing pruning frequency, but also has some other advantages, such as delaying the growth rate of grass, reducing plant height and increasing the number of turf tillers. Although the root system became shallow, the secondary root growth of turfgrass accelerated, the fibrous root increased, and the root-shoot ratio of the whole plant increased. After the application of paclobutrazol, the drought tolerance of turfgrass was improved, the content of soluble sugar in stems and leaves increased, leaf transpiration decreased, and the water consumption of turfgrass decreased by about 25%. After treatment with paclobutrazol, the degradation rate of chlorophyll and protein of turfgrass slowed down, and the protective enzyme system changed, which could delay lawn senescence and prolong the ornamental green period of turfgrass. The use of paclobutrazol is generally in the rapid growth period of the lawn, the concentration of paclobutrazol is 200-300PPM, spray quickly and evenly on the leaf surface of turfgrass, pay attention to the concentration should not be too high, lest the inhibitory effect is too strong. It is usually sprayed 2-3 days after pruning. It is observed that the effect can be displayed 7-10 days after spraying: the lawn is dark green in appearance, the ornamental effect is excellent, and it can be maintained for a long time. The number of tillers per unit area of mixed lawn increased rapidly after spraying, which was about 15% higher than that without paclobutrazol. Therefore, the coverage rate of lawn can be rapidly increased and the turf can be formed quickly. In addition, compared with the unsprayed Kentucky bluegrass lawn, the plant height of the mixed Kentucky bluegrass lawn sprayed with paclobutrazol was reduced by half, which could greatly reduce the times of lawn pruning. It is worth noting that: first, after spraying paclobutrazol, the leaf color of turfgrass is dark green, which is an appearance phenomenon after application, some people mistakenly think that there is no need for fertilization, in fact, fertilizer should be applied to promote turfgrass growth. Second, the concentration is too high. When the inhibitory effect is too strong, 1-2 mg gibberellin can be used. 1 kg of water can be sprayed twice to relieve the symptoms of inhibition and restore normal growth. Third, paclobutrazol can be mixed with chemical pesticides, which can significantly improve its effect, such as the combined application of paclobutrazol and rare earth can significantly improve the tillering ability of lawn. Fourth, it is combined with mechanical pruning. Although paclobutrazol is more labor-saving, time-saving and labor-saving than mechanical pruning, it is difficult to replace mechanical pruning completely, and mechanical pruning can overcome the disadvantage of poor lawn evenness caused by chemical pruning.