Utilization of liquid organic fertilizers from banana stems and coconut husk to increase potassium (K) in alfisols and corn

The needs of plant potassium can be done by adding banana stem liquid organic fertilizer and coconut husk liquid organic fertilizer containing many K elements. This study aims to determine the increase in nutrient potassium and its effect on the growth of corn of Alfisols. The research design was a split-plot design consisting of the main plot as banana stem liquid organic fertilizer (P1) and coconut husk liquid organic fertilizer (P2). The sub-plots were d0 (0 ml), d2 (75 ml), d1 (50 ml), d3 (100 ml) obtained eight treatment combinations and repeated three times. Liquid organic fertilizer from banana stems and coconut husk can increase the availability of K in the soil. Coconut husk liquid organic fertilizer with 100 ml dose significantly affects the increase in pH, C-organic, Cation Exchange Capacity (CEC), availability of sodium, and exchangeable calcium. Also, it shows the highest average in increasing plant height and plant dry weight. The application of coconut husk liquid organic fertilizer significantly affects K content in plants and plant height. However, it has no effect on the dose given.