Nguyen Xuan Quat Vu Van Me Doan Bong INTRODUCTION In a response to the urgent requirements of reforestation and forest development in 1983, research for determination of forest tree species for forest economic regions and forest development has been founded and completed for the contents of a progressive national program of science and tectnique with the code 04.01. This program was presided over by the forestry branch. Stipulations about tree species structure for reforestation … [Read more...]

Phi Quang Dien In Vietnam, scientific studied on Casuarina have commenced only recently. Studied on planting technique in southern Quang Binh and Tuy Phong were carried out by Prof. Lam Cong Dinh and the results are presented in section 2.1. Studied on genetic improvement and propagation have just started and are summarised below. 1. Cutting propagation C. equisetifoliacan be vegetatively propagated by air layering (Haraliap, 1972). Vegetative propagation through rooted cuttings of … [Read more...]

Cao Tho Ung Hoang Minh Giam Tran Ngoc Anh INTRODUCTION The coal mining branch is increasing more quickly than the supply of mine props. But until now the mine prop supply has been taken from the natural forest, which rapidly diminishing. During 5 years from 1981 - 1985 the natural forest area of Quangninh province has decreased by 6 percent. The total reserve of wood decreased 45 percent. Speed of reforestation is very slow and the low rate of growth of forested area has not … [Read more...]

Nguyen Duc Kham Le Xuan Nguyen INTRODUCTION Previously, some scientists have paid attention to studying or summing up techniques of Lac insect raising in practice. However, these documents still have many limitations because the biological characteristics of the Lac insects were not fully investigated. RESEARCH CONTENT AND RESULTS The research subject has found a preliminary solusion to the following problems: 1. Lac insects used in practice consist of not only one, but 3 … [Read more...]

Le Nam Hung Nguyen Van Do Every year Shellac production is seriously damaged by insects ( more than 30%, Le Van Giai, 1965) and mainly by white butterfly. Based on research carried out on this butterfly in China, Wang Kinh Ti ( 1963) expressed similar opinions. RESEARCH CONTENT AND RESULTS After three years of raising white butterfly in the laboratory and experimental gardens (1971 - 1973), some results are as follows, 1. The white butterfly is a small species which is active … [Read more...]

Dang Van A Ha Van Thi INTRODUCTION So far shellac production in Vietnam is still low and unstable due to short comings in the raising technique of Lac insects. Techniques relating to breed collection, breed raising, tending etc. in different seasons and on different tree species can still be carried out carelessly. To contribute to the solution of the above problems, research on techniques of raising Lac insects was carried out at Ngoclac ( 1971 - 1973) and Quanhoa ( 1974 - 1977) … [Read more...]

Nguyen Ba Chat Bui Hai Ngoc INTRODUCTION In the research program ( 1981 - 1985), number 04-01 determined systems of silvicultural technical operations for production of wood timber in Songhieu . A system was determined in the research on forest reclamation by Chukrasia tabularis in Songhieu region. This is one of the technical themes with results. Experimental models were based on plot production. 60 ha of pilot production were established for 2 years ( 1985 - 1986). Songhieu is … [Read more...]

Nguyen Hoang Nghia Le Dinh Kha INTRODUCTION Eucalyptus is one of the main planting species in Vietnam, not only for concentrated plantations, but also for scattered planting and planting in farms. Up to 1989, many results have been reported by our Institute and other organizations, however, since 1990, Eucalyptus planting and trials have faced new demands and problems such as fungus disease, productivity of plantations, requirements for export etc. This report will provide the latest … [Read more...]

Le Dinh Kha Phi Quang Dien The genus Casuarina consists of 45 species distributed mainly in the tropical area of the Southern hemisphere. Casuariana equisetifolia is a highly valuable species and is widely planted in most countries in tropical areas. Casuariana equisetifolia has been introduced into Vietnam since 1896. In the 1930’s, it was widely planted in the central provinces. In the 1960’s, Casuarina equisetifolia was planted over large areas to prevent movement of … [Read more...]

Nguyen Hoang Nghia Le Dinh Kha INTRODUCTION Acacia is a plant genus belonging to Legumirosae family and Mimosoidae sub-family, with about 1200 species having distribution in Asia, Africa, America and Oceanea. In the last 20 years in tropical Asia, Acacia species have played a very important role in afforestation programmes, especially Australian acacias such as Acacia auriculiformis and A. mangium. In the early 1960s, almost 20 Acacia species originating from Australia were … [Read more...]