EFFECT OF AZOLLA PINNATA-BASED BIOFERTILIZER ON N-UPTAKE, PH, AZOTOBACTER SP. POPULATION, AND YIELD OF PAKCOY (BRASICA RAPA L.) ON INCEPTISOLS FROM JATINANGOR

Abstract

Inceptisol Jatinangor West Java soil conditions have a low fertility. Actions that can be made to improve the soil conditions of Inceptisols are by applying organic fertilizers to improve the physical, biological, and chemical properties of the soil and adding available nutrients to increase the quantity of crop yields. The purpose of the study was to determine the concentration of Azolla pinnata-based biofertilizer that could produce the best results against Azotobacter sp. population, N-uptake, pH, and yield of pakcoy plant. The research was carried out at the experimental garden, Faculty of Agriculture, Universitas Padjadjaran, Jatinangor, West Java. The research design used in the experiment was a Randomized Block Design (RBD) which consisted of thirteen treatments, namely: control (without the application of Azolla biofertilizer), Azollabased biofertilizer with a concentration of 5 ml L-1, 10 ml L-1, 15 ml L-1, 20 ml L-1, each concentration treatment was combined with 3 application times, namely 1, 2, and 3 times. The experimental results showed that the treatment of Azolla-based biofertilizer with a concentration of 10 ml L-1 with 2 times applications increased the N-uptake, pH, and yield of pakcoy plants 184 g of fresh weight pakcoy/polybag. The population of Azotobacter sp. was not affected by the application of Azolla pinnata-based biofertilizer.