The absorbent resin for hardened basis material was studied by aqueous solution polymerization which was prepared through graft copolymerization of potato starch with acrylic acid initiated by ammonium persulfate and sodium sulfite.

Preliminary study on shaping property of parametric random processes;

The light media mainly made from bagasse,coir,rice hull were tested.

With broad-leaved trees,such as Manglietia yuyuanensis,Michelia maudiae,Cinnamomum porrectum and Sloanea sinensis Hemsl,as experimental materials,the light media,the standards of the containers,the quality of broad-leaved trees raised in the seedling containers and so on were studied.

As a kind of Fast growing tree species, Eucalypt play an important role in developing forestation in south ChinaJt s necessary to develop a new method for Eucalypt rooted cutting propagation by using the light media instead of deep yellow soils.

The production of eucalyptus cuttings,however,have not been realized automation,and the most important reason of this is the lack of proper light medium.

Coconut chaff,peat soil and yellow soil are taken as the light medium for Eucalyptus rooted cuttings.

Through a 2 × 2 factorial outdoor experiment,the effects of leaf damage and sediment type on the compensatory growth of submerged macrophyte Vallisneria spiralis were examined.