Based on the site observation information, this paper made a study on the microclimate effect of soybean close planting field and further analyzed its high yield mechanism, providing corresponding basis for probing into the rational close planting and optimized planting rules.

The stereoplanting with intercrop filler in close planting apple orchard that covered an area of 8 hm2 was studied in Songbai township,Wangjiakou village of Wulian county from 1992 to 1995.

67hm2 Chinese chestnut close planting orchard in Beitianzhang village of Wangshijing town of Wulian county from 1986 to 1995.

The total boll number per unit area was increased significantly with late and compact planting cultivation, and the li.

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;