| Summary: | 碩士 === 國立宜蘭大學 === 園藝學系碩士班 === 96 === The experiment was carried out in 2007 – 2008 to determine the effect of different intercropping systems on yeild, pest and disease infection of organic green onion (Allium fistulosum L.) under field conditions. In addition, land equivalent ratio (LER) as an index of intercropping advantage and output value were determined to assess the efficiency of different cropping systems. In summer, the green onion as a main crop was intercropped with maize (Zea mays) and cowpea (Vigna sesquipedalis) as intercrop. In winter, we intercropped green onion with tomato (Lycopersicon esculentum) and marigold (Tagetes erecta).
Each intercrop was planted between rows of green onion simultaneously in separate plots. All crops were also grown in pure stands.
Results of this study indicated that different intercropping systems compared to monocropping did not affect plant weight of green onion in summer. In winter, green onion / marigold intercropping system had the highest plant weight and yield.
LER values were more than 1 in all intercropping systems. Output values of intercropping systems were usually higher than monocropping systems.
Soil extract from monocropping system affected the germination percentage and mean germination time of green onion. In 2007 spring, the intercropping system didn’t suppress rust and pest infection of green onion. In 2008 spring, the infection rate of rust in green onion/marigold intercropping system was lower than the one in monocropping system.
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