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1st Int. Transborder Conf. of the Timor Island: Timor %u2013 Science without borderDili, 7-8 May 202565The Effect of Mycorrhiza and Type of Organic Matter on Chemical Properties and Corn Yields on AlfisolA.S. Muda., M.S.M. Nur*., and Y.I. BengguFaculty of Agriculture, Universitas Nusa Cendana, Jl. Adisucipto, Kupang, NTT 85001, Indonesia*Corresponding author: mahmuddin_nur@staf.undana.ac.idAbstractThe low availability of phosphorus is one of the main constraints on the lime-parent Alfisol soil on the island of Timor, although the total phosphorus content in the soil is very high. To increase the availability of phosphorus in corn plantations planted on Alfisol, soil fertility improvements are needed, for example, by applying mycorrhiza and organic matter that could increase the availability of phosphorus. This study aims to determine the effect of the combination of mycorrhizal and organic matter on the availability of soil phosphorus, as well as phosphorus absorption, and corn yield. This study used a Randomized Completely Blok Design with eight treatments and three replications, namely: No mycorrhiza + No organic matter (M0B0), No mycorrhiza + Rice husk biocar (M0B1), No mycorrhiza + Cattle manure biocar (M0B2), Mycorrhiza + Cattle manure (M0B3),: Mycorrhiza + No organic matter (M1B0), Mycorrhiza + Rice husk biocar (M1B1), Mycorrhiza + Cattle manure biocar (M1B2), and Mycorrhiza + Cattle manure (M1B3). Data were analyzed with analysis of variance and the Duncan Multiple Range Test. The observed variables were: organic C, total phosphorus, available soil phosphorus, phosphorus absorption, cob length, and 100-grain weight. The results showed that the combination of mycorrhiza and the type of organic matter significantly affected available of soil phosphorus, phosphorus absorption, cob length, and and 100-grain weight. The M1B3 treatment has the highest available soil phosphorus, phosphorus absorption, cob length, and weight of 100-grain weight. Keywords: mycorrhiza, organic matter, chemical properties.