Abstract
The nutritional content of cocopeat does not fully meet plant needs, so it needs to be combined with other organic materials such as manure.In addition, the relatively large porosity of cocopeat will affect plant productivity.This study aims to evaluate the nutrient content of cocopeat and the evapotranspiration that occurs during the plant growth period.This research method is experimental using various combinations of planting media with different ratios of cocopeat, husk charcoal, and compost, namely Variation A (50: 30: 20), Variation B (20: 50: 30) and Variation B (20: 50: 30) C (30: 20: 50).The parameters observed included air temperature and humidity (outside and inside the greenhouse), evapotranspiration, growing media temperature, leaf area, plant height, and leaf width.The data obtained were then processed using a statistical approach to determine whether the soilless planting medium using cocopeat had a significant effect on plant growth.The results showed that the addition of cocopeat had a significant effect on the growth of mustard plants for the parameters of leaf area and width, but not on plant height.At the highest percentage of cocopeat (50%) the temperature of the growing media was relatively more stable, but additional fertilizer was still needed for additional nutrients because the nutrients contained in cocopeat, even though it had been added with compost and husk charcoal, did not support the growth of mustard plants.The value of plant evapotranspiration (Etc) outside the greenhouse (outdoor) and inside the greenhouse (indoor) is not much different, with an average value of 32.84 mm/day and 33.78 mm/day for October and 16.49 mm/day and 17.47 mm/day for November.The composition of the planting medium affected the leaf area and width of the mustard plant, but not the plant height.Mustard plants on growing media with the highest percentage of cocopeat had the best average leaf width compared to media with less cocopeat.