2014 Volume 42 Issue 2 Pages 130-136
The main objective of this study is to reduce weeding costs of rural levee banks by using Zoysia japonica ‘Asagake’ to convert existing weeds. Asagake is one of the registered cultivars of Z. japonica Steud. in Japan. It quickly grows by producing with many vigor solons. ZNET (Zoysiagrass Net-planting Technique) is the advanced broad-casting sprigging method that is also developed in Japan. It consists of two cotton nets and sprigs. Sprigs are unfirmly oriented between the two cotton nets and rolled, but easy to carry into or quickly rolled-out onto planting area. We discussed the effects of with and without weed free bed soil, two sprig sizes and herbicide application on Asagake’s cover rates of one year after planting during the established period. The 5-cm-thick layer of weed seed-free, decomposed granite bed soil showed the most effective as the factor that contributed 60 to 80% on Asagake’s cover rates at one year after planting, because of the less weed competition. However, two sprig sizes (9 and 18 cm length, at the rate of 402 and 242 sprigs per square meters respectively) and herbicide application (asulam at the rate of 0.185 a.i. per square meters) had no or much less effects on Asagake’s cover rates of one year after planting.