| Summary: | 碩士 === 國立臺灣大學 === 農業化學研究所 === 90 === The purpose of this experiment was to evaluate the fertilizer efficacy of composts. Two kinds of commertial composts : food waste compost and manure compost were taken for this experiment. Pak-choi was planted as indicator crop. All fertilization plots were repeated once successively. This experiment was carried out at Taipei Branch of the Taoyuan District Agricultural Improvement Station. There were three fertilization treatments : (1) chemical fertilizer, 0, 70 and 140 kg N ha-1 (2) food waste compost, 0, 5, 10, 20 and 40 Mg ha-1 (3) manure compost, 0, 5, 10, 20 and 40 Mg ha-1. All treatments were triphicated. All plots were 1 m × 3 m in area. Soil was sampled randomly from all plots prior to and after the Pak-choi harvest. Soil samples were analized : the organic matter, total N, NO3--N, NH4+-N, available P, K, Ca, Mg, Fe, Mn and Al. The harvested Pak-choi shoot were analized : total N, NO3--N, NH4+-N, P, K, Ca, Mg, Fe, Mn, and Al. The root samples were analized : total N and the dry matter. During the experiment, the sunlight insolation length and the daily average temperature were recorded daily.
Results showed that, The longer sunlight insolation and higher daily average temperature during the first crop growth period resulted in higher yield. In both crops, the yield of the chemical fertilization plots were higher than those grown with compost fertilization. By means of Metscherlish-Baule growth low, It was found that the fertilizer efficacy of the manure compost was better than that of the food waste compost. The experimental results were very much disturbed by the original soil fertility of the experimental field, since it has been long used for vegetable cultivation with heavy fertilization.
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