引起蘆筍園缺株原因之調查

Investigation on the Factors Affecting the Missing Plants in Asparagus Fields

由本調查研究中初步確定植株年齡，種植方向與栽植密度對蘆筍缺株之發生並無顯著之影響，而品種間則有顯著差異。其中美麗華盛頓比UC309較易引起缺株，而由美國進口之蘆筍種子又比本省產之一代種子較易引起缺株。連作為引起缺株發生之最重要因子，平均缺株率高達29.0%，而缺株率高達40.0%以上之蘆筍園均為連作蘆筍一次以上之筍園。

Based on the results of this investigation, the aging of plants, the direction of planting row, and the density of plant population did not show any significant influences on the occurrence of missing plants in asparagus fields. However, varietal difference showed profound effects on the occurrence of missing plants, i.e. cv. Mary Washington easily caused more missing plants than cv. US309 did, the imported seeds had more missing plants than the local F1 progeny seeds had. Among the factors investigated, the successive cropping of asparagus in the same field was the most important and averaged 29% of missing plants. And also, the fields with more than 40% of missing plants were attributed to the successive cropping.