QUANTIFICATION OF TOTAL NITROGEN RATE CHANGE IN SOIL AND PLANT TISSUE OF SOYBEAN (GLYCINE MAX (L.) MERRILL) VAR. ANJASMORO DURING THE CULTIVATION PROCESS AT ITB JATINANGOR

• Main Author: Palupi, Shinta
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43085
• Institution: Institut Teknologi Bandung

Nitrogen is one of the most essensial element for soybean plant that is used mainly to form its vegetative organ and protein content. Nitrogen needs of soybean will varies according to the stage of growth. The purpose of this study is to quantify the changing rate of total nitrogen in soil and soybean plant tissue during the cultivation process. Observation is done once a week for 13 weeks by taking plant tissue and soil samples from 3 polybags selected randomly. Total nitrogen is analyzed using Kjehldahl method. The result of this study shows that plant’s nitrogen supply is not only obtained from its growing media, but also from nitrogen fixation that is done by symbiotic nitrogen fixing bacteria forming nodulation in roots, and by non-simbiotic nitrogen fixing bacteria living in soil. Average rate of total nitrogen content in growing medium varies from 0.20% to 4.01%, the lowest rate occurs before additional material added to soil, while the highest rate occurs at 1 week after planting (WAP). The average rate of total nitrogen content in plant tissue varies from 1.80% to 8.07%, the lowest rate occurs at 8 WAP, and the highest rate occurs at 4 WAP. The soybean plant in this study grew with etiolation due to lack of light intensity, thus there is a 2 weeks extention of its vegetative phase. Total nitrogen used for the 2 weeks extention is 4,6%. While the total nitrogen uptake of the soybean plant is 2,881g/plant and there is 26.285 g/plant of additional total nitrogen to the system.