Oil palm is among the strategic commodity of Indonesian agroindustry. The oil produced from the fresh fruits bunch through several steps of extraction process. The oil palm industry contributes to the advancement of country’s economy, development and human resource. It provides job for more than 50 million Indonesian, directly or through secondary activities. Today, the industry needs to improved its efficiency, to address market competition and global demand. In the upstream region, oil palm plantation still practices outdated method, particularly harvest. Improper harvest decision contributes to national production loss of 15%. This study aimed to identify the optimum time for harvesting the oil palm FFB. When harvested on prime and optimum ripe, the FFB can yield 25-28% of oil extraction rate (OER), much higher than the current 18-20% nation-wide OER. While the FFB is commonly harvest according to its physical properties (fruits’ colour and the number of loose fruits), the visual based observation is subjective and prone to influence by the mental state of the labour. Here, device which can identify the FFB true ripeness is needed to perform proper harvest when the FFB truly obtained its optimum ripe. Our previous studies suggest that, upon grading, the FFB quality can be identified by its optical properties. The same approach opens the possibility to be used when evaluating the FFB for harvest. In this study, the FFB colour model was established to identify the optimum harvest window of FFB under observation.

This study aims to determine the concentration of liquid organic fertilizer vermicompost and ZPT cytokinins on the growth and yield of mustard greens (Brassica sinesis L). This research was conducted in Mojoruntut Village, Krembung District, Sidoarjo Regency from December 2022 to January 2023. This research method was carried out using a factorial randomized block design (RAK) consisting of 2 factors. The data obtained were processed using ANOVA, if there were differences between the treatments, the 5% BNJ test would be continued. The variables observed were plant height, number of leaves, fresh weight, dry weight, root length, and harvest index. Based on the results of the study it can be concluded that the application of liquid organic fertilizer from pineapple peel waste has a significant effect on the observation variables of plant height, number of leaves, fresh weight, dry weight and root length. While not significantly different in the harvest index observation variable. The optimal administration of liquid organic vermicompost fertilizer and cytokinin ZPT is with a concentration of 25 ml/l (P4) and 2ml/l (Z1).

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