<![CDATA[Alfisol is one type of soil that chemically has a very low level of fertility, especially nutrients N, P, K and organic matter, therefore it is necessary to improve alfisol soil by applying manure and ZA. The purpose of this study was to examine the effect of manure and ZA (Zwavelzure Ammonium) in improving the chemical properties of alfisol soil and the best treatment. The research was conducted at the UPN Jatim Faculty of Agriculture in March - June 2023. The research method used a randomized group design RAK factorial with two factors. The first factor is the type of manure, namely without manure, chicken coop, cow pen and goat pen with a dose of 20 tons/ha each. The second factor is the concentration of ZA (Zwavelzure Ammonium) fertilizer, namely without ZA, ZA 100 kg/ha, ZA 200 kg/ha, ZA 300 kg/ha, each combination is repeated three times. The results showed that the application of manure types can improve the content of C-organic, CEC, P-available, and length of corn plants, the application of ZA fertilizer can reduce pH, while the interaction treatment of manure types and ZA fertilizer can increase the content of NH4+ (ammonium), NO3- (nitrate) and has no effect on C-organic, CEC, P-available, and length of corn.]]>
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