Corn is a type of plant that contains high carbohydrate. It can grow in dry season. Current climate change causes disadvantages in climatic condition such as short rainy season and long dry season. The purpose of this research is to study the effect of rhizobacteria to the yield of several corn varieties. The research was conducted in Kalasan, Sleman, Yogyakarta, Indonesia. The research used a Split Plot Design. The first factor as main factor showed a high variety of corn yield, namely Hybrid 1, Hybrid 2, Hybrid 3, and Hybrid 4. The second factor as sub-factor was rhizobacteria level (0% and 15%). The data was analyzed using Analysis of Variance. Based on the research results, there was a long dry season and short rainy season which were caused by climate change. Corn variety did not affect growth rate, yield and yield index for it’s resistant to climate change. Rhizobacteria increases the growth rate and tolerance index and making yield index to be higher than non-rhizobacteria which can help corn to survive in climate change.

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Background and Objective: The need for functional food is increasing along with the increase in population. Meanwhile, Indonesia experiences the conversion of agricultural land into non-agricultural land reaching 120,000 ha per year. Therefore, one of the cultivation methods for the development of functional food crops is the intercropping system. To support soil fertility, various organic fertilizers are used, namely cow manure, chicken manure and municipal compost. The purpose of this study was to evaluate the efficiency of the intercropping system of sweet corn and vegetable soybeans in the application of the combination of different organic fertilizer sources and dosage of NPK fertilizer. Materials and Methods: 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 replications. The first factor was the source of organic fertilizer consisting of three sources (cow, chicken manure and municipal compost) and the second factor was dosages of NPK consisting of three levels 200, 300 and 400 kg haG 1 , so that obtained 27 unit of experimental plots. The observation variable includes components of growth, yield and efficiency of land. The Analysis of Variance (ANOVA) at a significant level of 5% was used to analyze the significant differences between treatments, followed by Duncanʼs Multiple Range Test at a significant 5%. Results: The application of a combination of chicken manure with a dosage of 300 kg haG 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 land equivalent ratio, competition index, crop system efficiency and actual yield total. Conclusion: The intercropping system of sweet corn and soybeans could increase the productivity of both crops and improve land efficiency, including land equivalence ratio, competition index, crop system efficiency and total yield. Cow manure or municipal compost combined with NPK fertilizer at 300 kg haG 1 could improve the yield of corn and soybean.

Red onion has high nutrient and economic value. Onion can grow in both dry and wet season. Currently, we face climate drawbacks such as long rainy seasons and a short dry season due to climate change. This research aims to study the affects of rhizobacteria on the three red onion yield varieties. The research was conducted in Balecatur, Gamping, Sleman, Yogyakarta, Indonesia. The research used a Split Plot Design. The main factor was red onion variety, namely Bima, Biru and Thailand. The sub-factor was Rhizobacteria with a concentration of 0%, 0.75% and 1.5%. The data were analyzed using variance analysis with 5% significance level. The results showed that rhizobacteria increases the growth rate and tolerance index in red onion. Rhizobacteria does not increase yield and red onion yield index. Biru variety was as good as Thailand variety in terms of the number of bulb per plant, weight bulb per plant and yield. Thailand and Biru varieties are suitable in rainy season. Bima variety has the lowest number of bulb per plant, weight bulb per plant, growth rate, yield and yield index.