VN U Jo u m al of Science, E arth Sciences 24 (2008) 52-56 Assessing effects of the waterholding bioproduct Lipomycin M o n t h e a m o u n t o f e f f e c t iv e w a te r in th e s o il Le Van Thien*, Nguyen Kieu Bang Tam College o f Science, VNU R eceived 06 Jan u a ry 2008; rcceived in revised form 14 A pril 2008 A bstract Biological so lu tio n u sin g strain Lipomyces starkeyi 7.1, w h ich can p ro d u c c viscous m em b n es to im p ro v c d ry soil is co n sid ercd to bc su stain ab le for slopc lan d im p ro v cm en t The resu ỉts of re scarc h on Lipomycin M ability to k cep cffectivc w a te r in th e soil of M e Linh District, V inh P h u c P rovince sh o w th a t in th c soil sam p lcs cultivatcd trad itio n al m cdicinal trees, thc total am o u n ts of effective w a te r in th e soil fertilizcd Lipomycin M (takcn out u n d c r p ressuro pF 2.5-4.2) a re alvvays h ig h c r th a n th a t in control soil plo t (vvithout Lipomycirt M): th e am o u n ts of eííectivc w a te r in CT2 account for 24.8%, CT3 - 25.1% in com parison vvith DC (control plot) - 17.1% C o m b in a tio n of Lipomỵciìt M w ith NPK an d m icrobial fcrtilizers m akes the a m o u n t of cífectivc w a tc r in th c soil h ig h c r th a n th a t in th c casc of u sin g o n ly Lipomyciĩĩ M S im ilarly, the am o u n ts of effective w a tc r in th e soil sa m p le s c u ltiv a tc d tea an d m a n u re d th e b io p ro d u c t Lipomycin M arc h ig h cr th a n th o se for th e soil sa m p le DC an d p ro p o rtio n al to the tim cs o í m a n u rin g th c bioproduct: TN3 - 29%, TN1 - 24.8%, a n d D C - 22.2% Keyivords: W ate rh o ld in g ; B ioproduct; Lipomyciĩi M; Eíícctivo vvater; pF Introduction w ater used in production Biological m ethods, including applying m icroorganism s to im prove dry soil are considered to bc íeasible for sustainable production It can bc seen that soil m icroorganism s are vital ÍOT im proving soil They are environm entally effective and íriendly solutions because they not cause a decline in the soil m icroorganism s and help to enhance the soil biodiversity VVater holding bioproduct Lipomycin M is produced by scientists of Institute of Biological Technology (Vietnam Academ y of Science and Technology) from yeast of Lipomyces starkeỵi 7.1 vvhich has ability to W ater is vital for plants Plants cannot grovv w ithout w atcr W ater accounts for 7080% of the p lan t w eight Today, d em and for w ater in liíe an d in d u stry dram atically increases, th u s causing íresh vvater scarcity, suríace w ater pollution and the risk of inability to p ro v id e w ater for life and production So, it is necessary to fincỉ solutions to im p ro v e d ry soil, uncovered soil and bare hill, and to reduce the am o unt of * C orresponding author Tel.: 84-4-916027871 E-mail: thienyi^gmail.com 52 Le Van Thien, Nguỵen Kieu Ban