Eucalyptus<\/em> height growth
\nfor each of the above treatments was 14.8%, 10.3% and 33.9% more than the
\ncontrol treatment and that diameter growth was 10.6%, 28.2% and 40.4% greater
\nthan the control.<\/p>\nGrowth
\ncan also be increased by addition of Nitrogen and Phosphorous fertilizers and
\nwith weed control.<\/p>\n
This
\nstudy is a collaboration between FSIV, the Centre for International Forest
\nResearch and of the Ministry of Agricultural and Rural Development (MARD).<\/p>\n
Keywords:<\/strong>Site management, Nutrition,
\nSoil fertility, Productivity plantation.<\/p>\n <\/p>\n
EVALUATINGTHENORMAL
\nFORM FACTORTO
\nDETERMINE TREE VOLUME FOR SOME MAIN COMMERCIAL TREE SPECIES IN CENTRAL HIGHLANDS<\/span><\/h1>\nPhung Nhue Giang and
\nVu Tien Hinh<\/strong><\/p>\nForestry<\/em> University<\/em><\/p>\nSUMMARY<\/span><\/h1>\nCalculating tree volume
\nof<\/span> individual standing<\/span> trees<\/span>
\nusing the normal form factor has been used widely in Vietnam<\/span>.\u00a0 However, development of
\nvolume tables for estimating standing volumes of individual trees in natural
\nforests<\/span> in the Central Highlands
\nrequires validation.<\/span><\/p>\nA dataset comprising measurements from
\n1,556
\nfelled trees covering 29<\/span> tree<\/span> species was used to compare the derived volume using the form factor
\nequation with actual volume.\u00a0 In general volume
\ncan be predicted using diameter and height with the prediction error being less
\nthan approximately 4%, and on average within 1.8% of true volume.<\/span><\/p>\nKeywords<\/strong>: Normal<\/span> form factor, Standing<\/span>
\ntree volume<\/span>, Volume<\/span> error<\/span>, Normal distribution.<\/span><\/p>\n\u00a0<\/span><\/h1>\nIMPROVING PLANTATION PRODUCTIVITY FOR THE VINH HAO FOREST COMPANY,
\nBAC QUANG DISTRICT, HA GIANG
\nPROVINCE<\/span><\/strong><\/p>\nCao Van Son<\/strong><\/p>\n <\/p>\n
SUMMARY<\/span><\/h1>\nVinh Hao forest company has a forest estate comprising
\nplantations and natural forests managed for wood production to supply the pulp
\nand paper industry.\u00a0 From 2004 to 2011,
\nthe company established 2,618 ha plantations using four main species: Styrax tonkinensis<\/em>, Acacia mangium<\/em>, Acacia hybrid<\/em>
\nand Dendrocalamus membranaceus<\/em>.\u00a0 The company also undertook stand improvement
\nactivities over 8,252 ha and managed 11,249 ha as protection forest.\u00a0 During this period, the company conducted
\nharvesting operations over 1,538 ha producing 80,660 m3<\/sup> with a value
\nof 65,250 million VND.<\/p>\nTo date the company has yet to take advantage of newer
\ngenetics or advanced silvicultural techniques to optimize productivity from its
\nforest estate.\u00a0 The company has also
\nmoved from employing its own labour workforce to a contracted workforce,
\nimproving internal productivity.<\/p>\n
Keywords:<\/strong> Paper material supply Plantation, Vinh Hao forest company, Ha Giang
\nprovince<\/p>\n<\/h1>\nVALUE CHAIN ANALYSIS FOR PLANTATION TIMBER <\/span><\/h1>\nLe Thi Tuyet
\nAnh and Hoang Lien Son <\/strong><\/p>\nForest Science
\nInstitute of <\/em>Vietnam<\/em><\/p>\nSUMMARY<\/span><\/h1>\nA value chain analysis describes the full range of
\nactivities which are required to bring a product or service from conception,
\nthrough the different phases of production delivery to final consumer.\u00a0 Each step of the chain adds value to the
\nproduct.\u00a0 The value added is the difference
\nbetween expenses and the sales price of the product as it is moved along the
\nchain.<\/p>\n
Value chain analysis also needs to
\nconsider the relationships between the agents affecting each step of the
\nchain.\u00a0 To date our analysis indicates
\nthere are two important relationships:<\/p>\n
(i) The
\nvertical relationship<\/em> \u2013 the relationships between successive agents as the
\nproduct is exchanged, and<\/p>\n\u00a0(ii) The internal relationship<\/em> \u2013 the
\nrelationships between agents at the same position in the value chain which may
\ninclude support, services, mechanisms and policies.<\/p>\nThe research is contributing to determining
\nthe activities necessary for the rational development of the forest plantion
\ntimber product value chain in Vietnam.<\/p>\n
Keywords<\/strong>:<\/strong> Value chain, Commodity chain, Plantation
\ntimbers, Agents.<\/p>\n\u00a0<\/span><\/h1>\nDeveloping A method
\nfor interpolating the main meteorological factors used in forest
\nfire forecast<\/span><\/h1>\nBe Minh Chau<\/strong><\/p>\nSUMMARY<\/span><\/h1>\nUnderstanding the climatic and environmental factors that
\naffect fire behaviour is important in predicting danger and fire risk.<\/p>\n
Using long term data from 158 national meteorological
\nstations across Vietnam it was possible, using multivariate statistical
\nmethods, to determine the principle meteorological factors to predict the
\npotential for fire along longitudinal, latitudinal, and elevation gradients.<\/p>\n
The principle determinant of fire prediction was temperature
\nregardless of longitude, latitude or altitude, whereas humidity and rainfall
\nwere less useful determinants.<\/p>\n
It was possible to develop a set of equations to
\nrelate these meteorological factors with longitude, latitude and altitude by
\nmonth for each of three regions of the country; northern region (>19o <\/sup>N),
\ncentral region (from 13o<\/sup> to 19o <\/sup>N) and southern region
\n(< 13o <\/sup>N).<\/p>\nKey words:<\/strong> Forest fire forecast, Method for interpolation, Meteorological factors<\/p>\n<\/h1>\nDEVELOPING A SYSTEM
\nFOR MIST IRRIGATION IN THE CUTTING HOUSES <\/span><\/h1>\nLe Xuan Phuc<\/strong><\/p>\nForest Science Institute of Vietnam<\/em><\/p>\nSUMMARY<\/span><\/h1>\nIn Vietnam
\nthere is an increasing demand of high quality genetically improved seedlings
\nfor forest plantation establishment.
\nMost seedlings are propagated as cuttings as this is a relatively simply
\ntechnology which allows for efficient rapid production and can be undertaken at
\na local level by rural communities.<\/p>\n
However there can by production issues which may prevent
\nsatisfactory production such as inadequate misting irrigation reducing the
\nstriking rate of cuttings leading to reducing seedling quality.<\/p>\n
The results of testing various misting systems indicates
\nthat the Coolnet sprayer, Model C20, manufactured by Netafim, is suitable under
\nVietnam conditions when operated with 4 spraying units at a spraying pressure
\nof 3.5 to 3.6 kg\/cm2<\/sup> covering a width of 65 cm at a height of 30 cm.<\/p>\nKeywords:<\/strong> System of mist irrigation, Sprayer,
\nWater pump, Cutting environment<\/p>\nTERMITE AND FUNGAL CONTROL FOR
\nSEEDLINGS OF EUCALYPTUS<\/em> AND ACACIA<\/em><\/span><\/h1>\nNguyen Thi Bich Ngoc and Bui Thi Thuy<\/strong><\/p>\nForest
\nScience Institute of Vietnam<\/em><\/p>\nSUMMARY<\/span><\/h1>\nIn Vietnam, termite (Isoptera) damage
\nhas been recorded in Eucalyptus<\/em> and Acacia<\/em> plantations in many areas.\u00a0 Measures to prevent termite damage in newly
\nestablished plantations has been
\ntrialed in three ecological regions of Vietnam:
\nNortheast, Northwest and Central
\nHighlands.<\/p>\nThe application of Termidor25EC and Lenfos 50EC (active ingredient: 0.2-0.3%) applied at one litre\/tree reduced termite damage to seedlings from 22.2% to 16.7% forEucalyptus <\/em>\u00a0and from 21.5% to 18.8% forAcacia<\/em>.<\/p>\nMetarhrizium is a entomopathogenic
\nfungal genus which can be used as a natural biological
\ncontrol agent against insects.\u00a0 In
\ntrials, Metarhrizium reduced termite damage to 14.4% and 13.2% of Eucalyptus<\/em> and Acacia seedlings<\/em> respectively.<\/p>\nKeywords:<\/strong> Termite, Eucalyptus, Acacia<\/p>\n<\/p>\n
<\/p>\n
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\nSimple-sequence-repeat (SSR) markers were used to assess the
\ngenetic diversity of 100 clones of A. mangium<\/em> growing in <\/span>clonal seed orchards (CSO) at Ba Vi and Cau Hai.<\/span>\n<\/p>\n\nThe mean expected and observed heterozygosities were 0.437
\nand 0.495 respectively. <\/span>The average
\nnumber of alleles observed with each marker was 3.078 against while the
\nexpected number of 2.731. <\/span>As
\nheterozygosity was greater than expected, there was limited evidence of
\ninbreeding in these orchards.<\/span>\n<\/p>\n<\/p>\n
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