| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 97 === This research take Shihgang Township, Taichung County cover grass class the land on slopes orchard surface as the research theme, discusses the orchard to explore the suitable management way, because the orchard after cuts grass artificially has knotgrass purification phenomenon, plants lives the cover effect very good also the management of facilities is very convenience. Therefore, this study adopted this as the experimental study’s main subject.
The research started from August, 2008, six orchards were selected in Shihkang Township Countyis as the test area, including 3 employ weed killers and 3 not employ weed killers. The research items include such as the interview of local fruit farmer, investigates the orchard management way, the analysis climatic factors, the physiographic factor and the soil factor, investigates the orchard surface cover grass class, and analyzes the correlation between these factors.
The obtained results showed that, each item of environment factor and the relationship with the orchard weed growth, only with the partial environment factor and the minority grass inter-species have the relevance, dominance of the knotgrass has not reached the significant level of each item of environment factor. It is showed only the degree of soil hardness with higher relevance.
It may know that cover plant of investigation in six test area , has type of area superiority grass the employment weed killer to plant contains the Eleusine indica and the China nine lions grass and so on, the type diversifies, but has not employed the weed killer in the test area take knotgrass as the dominant species, because knotgrass after shear artificially mow can have the phenomenon of the purification. Passes through in addition calculates difference of index for weed of all test area, the obtained results demonstrated that test area every year employs one time weed killer each difference index to be in high degree, but for those test area has not employed the weed killer due to knotgrass makes the purification phenomenon to cause each difference index to be in low degree.
Due to its state characteristic, the strong shade tolerance as well as shear mow the purification phenomenon, knotgrass may cause the orchard the way of weed management to be simple, besides it may apply in does not employ the weed killer to plant organically, also may prevent many other type weeds of invasion to create inconvenient management. The orchard shears artificially after mows five to six times every year, after that one also does not use the weed killer for four years continuous , It is to be possible to make knotgrass become predominant grass for the orchard under the superiority grass plants, reduces other weed invasion, It should be a promoted way for orchard weed management way.
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