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Biofertilizers can increase the growth and yield of potatoes. However, each cultivar's response to biofertilizers' application varies greatly. This study aimed to examine the response of cultivars to the application of biofertilizers. The study was conducted at the plastic house of Cikole Village, Lembang District, West Bandung Regency, West Java, Indonesia from September 2020 to January 2021. The study used a randomized block design with two treatment factors and three replications. The first treatment factor was processed potato cultivars, namely Papita Agrihorti, Spudy Agrihorti, AR 08 Agrihorti, and Medians. The second factor was five types of biofertilizers: Trichoderma, Gliocompost, and Mycorrhizae, a single treatment of each biofertilizer, and control. Data were analyzed by ANOVA and if there was a significant difference, continued with Duncan's and correlation test. The results showed that the cultivar treatment had a significant effect, while the biofertilizer treatment had no significant effect on plant height and tuber weight per plant. The best cultivar treatment for plant height and tuber weight per plant was Papita Agrihorti. The types of biofertilizer on four potato cultivars gave various effects on the yield components of the number of small, medium, and large tubers, the total number of tubers per plant, and tuber weight per plant. [ABSTRACT FROM AUTHOR]

Good land preparation can be in the form of a combination of Trichoderma sp. and mulch. This study aimed to determine the effect of Trichoderma sp. and the application of mulch on potato yields. This research was conducted from October to December 2021 in Sindang Jaya village, Cipanas subdistrict, Cianjur Regency, West Java. The study used a randomized block design with two factorial treatments and four replications. The first factor was the application of local and commercial Trichoderma products in the planting holes and the beds. The second factor was mulch and no mulch. Mulch application was divided into two treatments, planting immediately after mulch installation and two weeks after. The parameters were analyzed by F-test followed by an orthogonal contrast test at a 95% confidence level. The results showed no interaction effect between Trichoderma sp. and mulch on potato growth and yield parameters. The use of mulch either immediately planted or after two weeks of installation increased the yield per hectare. Direct planting could increase the total tubers and the number of medium tubers compared to planting two weeks later. Treatment without Trichoderma had a higher yield than the treatment with Trichoderma, but it also had a high percentage of rot. Spraying Trichoderma onto the beds had a higher weight per tuber than planting holes. Local Trichoderma products had a higher number of small and total tubers than commercial Trichoderma products. [ABSTRACT FROM AUTHOR]