Forage Production and Nutritional Quality of Sorghum bicolor cv. Samurai-1 in Response to Urea and Arbuscular Mycorrhiza Fungi on Post-Coal Mining Land in South Kalimantan
Anton Kuswoyo1,2*, Luki Abdullah3*, Panca Dewi Manu Hara Karti3, Soeranto Human4, Tintin Rostini5, Efendi Eko Mulyono6, Endang Wawan6

1Nutrition and Feed Science Study Program, Graduate School of IPB University, IPB Dramaga Campus, Bogor - West Java, 16680, Indonesia

2Animal Feed Technology Study Program, Politeknik Negeri Tanah Laut, Tanah Laut Regency - South Kalimantan, 70815, Indonesia

3Department of Nutrition and Feed Technology, Faculty of Animal Science,
IPB University, IPB Dramaga Campus, Bogor - West Java, 16680, Indonesia

4The National Research and Innovation Agency (Badan Riset dan Inovasi Nasional/BRIN), Jakarta, 12440, Indonesia

5Department of Animal Husbandry, Faculty of Agriculture, Universitas Islam Kalimantan Muhammad Arsyad Al Banjari Banjarmasin. Banjarmasin - South Kalimantan, Indonesia

6PT Arutmin Indonesia, Asamasam Mine, Tanah Laut Regency - South Kalimantan, Indonesia

*Corresponding author: labdull[at]apps.ipb.ac.id- kuswoyo[at]politala.ac.id

Abstract

Forage is a critical component in ruminant nutrition, yet the availability of land for cultivating quality forage is increasingly limited. As a result, post-coal mining lands offer a promising alternative for forage production, despite their poor soil fertility and degraded structure. This study aimed to evaluate the forage production and nutritional quality of Sorghum bicolor cv. Samurai-1 in response to different urea fertilization rates and the application of arbuscular mycorrhiza fungi (AMF) on post-coal mining land in South Kalimantan, Indonesia. A randomized complete block design (RCBD) with a 2-factorial arrangement and four replications was employed. Factor A consisted of urea rates (200, 300, and 400 kg/ha), while Factor B involved AMF application (with and without). Results showed that both urea and AMF treatments had a highly significant effect (p < 0.001) on sorghum agronomic traits, including plant height, stem diameter, leaf length, leaf width, and number of leaves. Similarly, biomass yield (both fresh and dry matter) was significantly enhanced. In terms of nutritional quality, the combined application of urea and AMF significantly improved crude protein, crude fat, and crude fiber contents. These findings suggest that integrating urea fertilization with AMF inoculation can substantially enhance the productivity and forage quality of sorghum cultivated on degraded post-mining land.

Keywords: Arbuscular mycorrhiza fungi, forage quality, sorghum cv. Samurai-1, post-mining land, urea fertilization.

Topic: Animal feed and nutrition