University of Islam Malang
Purpose To study the direct efect on the frst mustard cropping and the residual efect of three kinds of vermicompost on the productivity of the second, third, fourth Pak-Coi mustard sequential cropping. Method A feld experiment was conducted for four sequential planting periods of mustard Pak-Coi in silty clay Inceptisol. The experiment used a factorial randomized block design with two factors. Factor I comprised three kinds of vermicompost with three types of bedding materials; V1—spent mushroom waste, V2—coconut husk, and V3—sugarcane trash, while factor II comprised four diferent application rates: 5, 10, 15, and 20 t ha−1. From these two factors, there were 12 treatments plus one control treatment (without vermicompost application). Results Application of vermicompost increased soil NPK content. The highest nutrient uptake was also found in the residual efect for the second cropping. Nutrient uptake of the third and fourth mustard cropping had a decreasing trend. The highest yield on the frst cropping was found in the application of vermicompost V2 and V1 with the application rates of 10–15 t ha−1. In the second cropping, the productivity increased, whereas the third and fourth sequential cropping decreased in the vermicompost V1 and V2, whereas in the vermicompost V3 the productivity of the third and fourth cropping was slightly increased. Conclusion The application of vermicompost to organic farming provides nutrient availability in four mustard subsequent planting periods. Diferences in the dynamics of nutrient availability, nutrient uptake and crop yields are afected by the vermicompost materials used.