Study on growth law of Glycyrrhiza uralensis under different planting density;

The paper through the trial involved in the treatments of 4 operations of cutting off stemp young stock plants above ground and of 4 planting density in Populus Jianhumao scion plucking nursery, reveals the relationship between the cutting yield and the treatments.

[Method] Spring cultivated cabbage variety-\'Qin\'gan 60\' was tested by setting up different irrigation freqnency treatment(interval 6,8,10(CK),12,14 d irrigation once),fertilizing quantity treatment(150,225(CK),300,450 kg/(hm2·once))and planting density treatment(67 500,60 000(CK),52 500,45 000 strain/hm2)in the cabbage growing season.

The planting density showed little impact on sapwood width,while it had highly significant effects on wetwood width.

The results indicated that the effects of planting density on crown width,crown length,DBH,wetwood areas,sapwood areas,wood basic density,compression strength parallel to grain and MOE were highly significant,and those effects on wetwood proportional,sapwood proportional and MOR were significan.

Taken Armeniaca sibirica forests in western region of Liaoning province as research objects,growth status and soil amelioration effect of Armeniaca sibirica forests under the condition of different densities were compared by the means of variance analysis and multiple comparison, and the optimum planting density of Armeniaca sibirica forests at different ages were chosen.

A fabric flocking density analysis;

Effects of planting density on growing characteristics of the ground of Potentilla anserina;

Effects of sowing date and planting density on the grain s protein component and quality of strong and medium gluten winter wheat cultivars;

Effection of planting density on the content of soluble amino acid of burley tobacco;

Effects of planting density on tree growth and wood quality and modeling the wood quality of Populus×xiaohei.;

Planting density has significant effects on fiber morphology, physical and chemical properties of Lalix olgensis wood.

Our objectives were to investigate the effects of sediment phosphorus concentration (SP), plant density (PD) and their interaction on the plasticity of T.