Mujiyo, M., Sutarno, S., Suwarto, S., Budiono, R. and sutopo, novi rahmawati (2020) “Inhibiting Factors of Land Suitability for Piper nigrum L. in a Hilly Area of Tirtomoyo District, Central Java”, JOURNAL OF TROPICAL SOILS, 25(1), pp. 29–37. doi: 10.5400/jts.2020.v25i1.29-37.