桑田 土壤面被覆이 桑樹의 根系分布 土壤의 化學性에 미치는 影響 = Spatial Variations of Root System and Soil Chemical Compoments in the Low-Cuting Mulberry Field under the Influence of soil Muching

다국어 초록 (Multilingual Abstract)

Soil mulching effect on the leaf yield and root distribution of mulberry tree and change in chemical properties of the soil was studied by conducting field experiment in the low-cutting mulberry field. For comparison, plots of clean tillage and herbicide weed control were made. The mulching materials used in the experiment were straw, chaff and polyethylene film. The results are summarized as follows:
1. The amount of fine and medium roots at the center part of the spacing increased by mulching. Chaff mulching increased espcially the amount of medium roots. The mulching treatment promoted the distribution of fine and medium roots at the depth of 20cm from the surface in the plots of polyethylene film and straw mulching.
2. It was evident that the pH and the content of Ca, Mg and available phosphate of the soil were higher in the center of the row spacing than in the surroundings of the tree, whereas the content of organic matter and exchangeable K were evenly distributed over the row spacing.
3. The chaff and straw mulching increased Ca and Mg content, but decreased the content of available phosphate in the soil.
4. There were no significant differences of root distribution and chemical properties in soil in the intra-tree space regardless of the locations.
5. The rate of cold injury of shoot tip increased in all the mulching treatments and especially in the chaff mulching.
6. The three year average leaf yield ('80 autumn-'81 autumn) was higher in the polyethylene film mulching than in the control. There was a distinctive decrease of it in other treatments and especially in chaff mulching.
7. The polyethylene film mulching increased the soil temperature by 1.4℃ and the other treatments rather decreased it by 1℃, as compared to the control.
8. The soil moisture content in the mulching plots was higher than in the control plot. In particular, the chaff mulching increased soil moisture content by 3∼6% than the control plot.