Evaluation of Intercropping System of Sweet Corn (Zea mays-saccharata Sturt) and Vegetable Soybean (Glycine max L. Merr) in Integrated Fertilizer Application

The purpose of this study was to evaluate the intercropping system of sweet corn and vegetable soybeans on the application of combination different sources organic fertilizer and dosage of NPK fertilizer. The research was carried out from June to August 2022 in the Giwangan Umbulharjo village, Special Region of Yogyakarta. The study was arranged in a factorial Randomized Complete Block Design with three replication. The first factor were the source of organic fertilizer consisting of three sources (cow, chicken manure and municipal compost), the second factor were dosages of NPK consisting of three levels (200, 300 and 400) kg ha-1, so that obtained 27 unit of experimental plots. The observation variable include component of growth, yield and efficiency land. The statistic analysis of data with analysis of variance (ANOVA) at a significant level of 5% followed by Duncan’s Multiple Range Test at a significant 5%. The result showed that the application of combination chicken manure with a dosages 300 kg ha-1 NPK fertilizer in the best growth and the highest yield of intercropping sweet corn and vegetable soybeans, and the component efficiency land showed the value of 1.55 Land Equivalent Ratio, 0.92 Competitive Index, 1.59 Crop System Efficiency and 1.07 Relative Yield Total.