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The application of plant growth regulator on controlling the forest trees growth

Posted at September 2, 2014 | By : | Categories : Company News | Comments Off on The application of plant growth regulator on controlling the forest trees growth
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As the forest trees all belong to perennial plant, the plant growth substances will have obvious effect on their growth development and acclimatization. It has become an important means of promoting forestry fast growing and high yield by regulating the trees growth with plant growth regulator. This technology can rapidly develop man-made forest and seedling production, which will have very wide development prospect. In addition, by using different plant growth regulator according to the different usages of forest trees, the quality of trees in the timberland as well as the yield and quality of forest products in the economic forest can be improved, moreover, the economic benefit and social benefit will be improved accordingly.

forest trees growth

The application of plant growth regulator on controlling the forest trees growth

Promote the fast growing of forestry

The main aim of planting forest trees is to fetch their stalks or some kinds of secondary metabolism substance, therefore, fast growing and high yield can be the basis of improving the outturn percentage of timber forest and quality of forest products. By using the growth promoter in the growing stage of forest trees when the increment of forest trees is in the rising stage and the trees are sensitive to plant growth regulator, the growth of forest trees can be accelerated, the seedling efficiency and the stem form of timber forest will be improved as well as the rotation will be shortened. Currently the plant growth regulators that can be used in accelerating the fast growing of forest trees only include naphthalene acetic acid, indolebutyric acid, gibberellin, 6-benzylaminopurine and so on. In order to ensure the effect of plant growth regulator, other relevant supporting measures are also needed, which are as follows: in order to keep the soil productivity, chemical weed control should be conducted before using the plant growth regulator; under appropriate watering, the seedling will absorb and metabolize the nutrient more effectively, besides, rational fertilization can meet the nutritional requirements of seedling. However, in the final-period management, water and fertilizer should be reduced so as to avoid the later maturation of seedling; by using the growth regulator in the fast growing period, the seedling will grow rapidly, the metabolism velocity will accelerate as well as the secondary product will begin to change, thus the bugs may be attracted and spawn as well as the trunk borer will be easy to invade, therefore, insect should be prevented.

Promote the lignification of forest trees

Forest trees will enter the seedling hardening period when they grow to a certain period. In the prior seedling hardening period, the seedling growth rate will slow down, the lignification degree will improve as well the requirements of water and fertilizer will also reduce until the terminal bud enter dormancy period. This process will be influenced a lot by the environment, especially the change of temperature. When the temperature increases suddenly, the lignification process will slow down. When the temperature reduces all of a sudden, the young seedlings that have not been highly lignified may be damaged, thus the seedling will be damaged and will have bad influence on the increment in the second year, moreover, it may lead to the plant disease and insect pests. Therefore, in the forest tree growth, growth retardant is generally used in accelerating the seedling lignification process and improving the stress resistance of seedling.

Generally speaking, growth retardant can be used once the seedling reaches to the specified height so as to promote the seedling lignification and prevent the seedling from freeze injury. Although the elongation growth almost stops after using the growth retardant, the thickening growth is still continuing. It can be seen that the growth retardant also has effect on thickening the tree diameter. Plant growth regulators that are commonly used in promoting the seedling lignification only include uniconazole, paclobutrazol, ethephon, chlormequat chloride, mepiquat chloride, daminozide, fosamine-ammonium, chlorflurenol-methy and so on. The growth retardant is usually sprayed on the stem leaf, which will inhibit the elongation growth of stem leaf, thus the increment and metabolism can be retarded and the seedling can accelerate the lignification. However, if the growth retardant is used too much, it will have certain influence on the seedling growth in the second year. For example, the seedling will still keep dormant in the growing season. At this moment, gibberellin and other pesticides can be used so as to solve this problem.

Other applications

Improve the survival rate

After years of afforestation, some barren mountains that have good site conditions have already fundamentally completed the afforestation. However, as the remaining barren mountains mostly have poor site conditions, it is very difficult for the trees to survive. By spraying the auxins growth regulator on the seedling, the survival rate can be obviously improved, which can be regarded as an effective way in solving the afforestation survival problems under dry site condition.

Chemical plastic of trees

Some broad-leaved forest is easy to have premature trunk bifurcation phenomenon, which will have bad influence on the utilization of timber. In order to increase the length of trunk, the lateral bud is usually erased artificially so as to reduce the tree branches. If the fosamine ammonium or paraquat is sprayed on the tree, lateral bud can be killed. Besides, it has high efficacy and will cause little bacterial infection.

Change the seedling transient time from vegetative growth to reproductive growth

Plant growth regulator can change the transient time from vegetative growth to reproductive growth, for example, by using gibberellin in the period when the pine trees transit from vegetative growth to reproductive growth, the transient time can be greatly shortened, thus the seed production stand can improve fructification. This technology has been used in foreign seed orchard.

Construct artificial multiple-layered-forest and maintain the biological diversity

Trees that grow in different levels should avoid the damage caused by the completive plants, therefore, the growth retardant or herbicide can be used so as to effectively control the mutual competent in different levels and the same level. Some multiple-layered-forest is difficult to form under natural conditions as the completive plants are too many for them to survive. Growth retardant or herbicide has provided a new way in solving this problem. By using chemical control technology, the artificial community can be constructed and the most reasonable ecological structure and high yield structure can be created as well as it can help to improve forest environment and beautify the environment.

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