1. Function:
By inhibiting the activity of the apical meristem and the longitudinal growth of the internodes, the height of the growth is controlled to promote tillering, and the internodes of the plant are shortened, thereby reducing the frequency of manual or mechanical cutting and reducing maintenance costs. It is mostly used to manage extensive highway slopes that are not suitable for mechanical pruning, and large lawns, especially suitable for the maintenance of high grass areas of golf courses.
2. Commonly used plant growth regulators:
Types of commonly used growth regulators Growth retardants are chemical agents that can delay the growth of apical meristems. Commonly used are chlormequat, dwarf phosphor, pyrimidinol and so on. Growth inhibitors are chemical agents used to completely inhibit the activity of new shoot apical meristems. Commonly used are paclobutrazol, Yichangling, Qingxiansu, 2,4-D butyl ester, Ping'an No. 13-Suyiping, etc.
3. The use of plant growth regulators on the lawn:
â‘ The dwarf effect of tall fescue sprayed with paclobutrazol was obvious, and the plant height inhibition was reduced by 50% to 80% compared with the control. Ping'an No. 13-Suyiping, after spraying, it can control the high growth of the lawn for 35 to 50 days. Use method alone. The spray method is simple and easy to implement and effective quickly. The growth regulators that can be used include chlormequat, butyryl hydrazide, penicillin, indol, ethephon, pyrimidinol and the like. However, some growth regulators can cause leaf shrinkage and deformation after spraying, so spraying is not suitable for use, but suitable for soil application, which can achieve the purpose of inhibiting stem growth after use.
â‘¡Soil application method saves medicine, is not easy to degrade, and has long effect. Suitable for soil application are pyrimidinol, penicillin, paclobutrazol, uniconazole, dwarf phosphorus and so on. Mixed use. Mixing two kinds of growth regulators can not only inhibit the growth of lawn grass, but also prevent broad-leaved weeds. If ethephon is mixed with 2,4-D butyl ester in a certain proportion, the above effects can be achieved.
③Precautions for the use of lawn growth regulators The concentration of each growth regulator has a certain range of action. If the concentration is too low, it will not have a certain inhibitory effect, and if the concentration is too high, it will be toxic to the lawn and even the whole plant will die. Therefore, before application, it is necessary to test on a small area of ​​lawn, and use the test results to determine the type and concentration of growth regulators that can be used. Do not apply blindly. Do not use it on lawns that have not been formed to avoid damage to the seedlings and delay the formation of a land. Weak lawns and lawns with disease can not be used temporarily.
â‘£ It should be applied during the vigorous growth period of the lawn, such as cold-season grass in spring and autumn, and warm-season grass in summer to achieve the best inhibitory effect. Paclobutrazol is generally applied 6 to 7 days before mowing. Do not use continuously and repeatedly to prevent excessive growth inhibition, early degradation of grass blades, sparse yellowing, and weak plants.
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