Soil Organic Matter in Various Land Uses and Management, and Its Accuracy Measurement using Near Infrared Technology Bambang Hari Kusumo, Aris Purwanto, Husni Idris, Sukartono, Lolita Endang Susilowati, Bustan
University of Mataram and IPB University
Abstract
Soil organic matter (SOM) has a very vital role in determining soil fertility status and land productivity. The amount of SOM in the soil varies greatly depending on land use and land management. This study aims to describe the SOMs status in various land uses and management, and to test the accuracy of near infrared (NIR) technology in measuring the SOM. A total of 100 soil samples (0-10 cm depth) were collected from various land uses and management (rain-fed land, irrigated land, land planted 1-3 times with annual crops, land planted with 1-3 perennial plants) in Kayangan Sub-District, North Lombok. The dried, ground and sieved soil samples were divided into 2 parts; some parts were analyzed using the Walkley and Black method, and the other parts were scanned using near infrared spectroscopy (NIRS). Partial least square regression (PLSR) was used to create a SOM prediction model. The results showed that the SOM content varied from very low to moderate. The content of SOM was significantly higher in the irrigated areas compared to the rain-fed areas. The SOM content was higher in the areas planted with annual crops 3 times a year compared to the areas planted 1-2 times a year. In addition, SOM content was higher in areas planted with 2-3 types of perennial plants, compared to those planted with 1 type of perennial plants. However, the SOM content was not significantly different in the area planted with annual and perennial plants. NIRS technology was relatively accurate in measuring SOM, which was compared with conventional (Walkley and Black) method. Thus, this technology can be used to monitor spatially changes in SOM. With the relatively low SOM in various land uses in the study area, the addition of SOM through fertilization is recommended.
Keywords: soil, organic matter, land use, near infrared, spectroscopy
If your conference is listed in our system, please put our logo somewhere in your website.
Simply copy-paste the HTML code below to your website (ask your web admin):