STUDY OF MAIZE’S P AND K FERTILIZATION ON ALFISOLS (Typic rhodustalfs) WITH ARTIFICIAL SOIL NUTRIENT CLASS
PETER TANDISAU
Researchers of South Sulawesi Assesment Institute for Agricultural Technology Jl. Perintis Kemerdekaan KM 17.5, Sudiang, Makassar, Indonesia
MARTHEN PASANG SIRAPPA *
Researchers of West Sulawesi Assessment Institute for Agricultural Technology, Kompleks Perkantoran Pemerintah Provinsi Sulawesi Barat, Jl. H. Abdul Malik Pattana Endeng, Mamuju 91522, Indonesia
KETUT INDRAYANA
Researchers of West Sulawesi Assessment Institute for Agricultural Technology, Kompleks Perkantoran Pemerintah Provinsi Sulawesi Barat, Jl. H. Abdul Malik Pattana Endeng, Mamuju 91522, Indonesia
. MUHTAR
Researchers of West Sulawesi Assessment Institute for Agricultural Technology, Kompleks Perkantoran Pemerintah Provinsi Sulawesi Barat, Jl. H. Abdul Malik Pattana Endeng, Mamuju 91522, Indonesia
IDA ANDRIANI
Researchers of West Sulawesi Assessment Institute for Agricultural Technology, Kompleks Perkantoran Pemerintah Provinsi Sulawesi Barat, Jl. H. Abdul Malik Pattana Endeng, Mamuju 91522, Indonesia
HESTI RAHASIA
Researchers of West Sulawesi Assessment Institute for Agricultural Technology, Kompleks Perkantoran Pemerintah Provinsi Sulawesi Barat, Jl. H. Abdul Malik Pattana Endeng, Mamuju 91522, Indonesia
. SYAMSUDDIN
Researchers of Central Kalimantan Assesment Institute for Agricultural Technology, Jl. G. Obos Km. 5, Menteng, Palangka Raya, Kota Palangka Raya, Kalimantan Tengah 73112, Indonesia
EDWEN DONALD WAAS
Researchers of Moluccas Assesment Institute for Agricultural Technology, Jl. Chr. Soplanit Rumah Tiga, Ambon, Indonesia
. WAHID
Researchers of Moluccas Assesment Institute for Agricultural Technology, Jl. Chr. Soplanit Rumah Tiga, Ambon, Indonesia
IRFAN OHORELLA
Researchers of Moluccas Assesment Institute for Agricultural Technology, Jl. Chr. Soplanit Rumah Tiga, Ambon, Indonesia
ROSNIYATI SUWARDA
Researchers of Moluccas Assesment Institute for Agricultural Technology, Jl. Chr. Soplanit Rumah Tiga, Ambon, Indonesia
RISMA FIRA SUNETH
Researchers of Moluccas Assesment Institute for Agricultural Technology, Jl. Chr. Soplanit Rumah Tiga, Ambon, Indonesia
*Author to whom correspondence should be addressed.
Abstract
This research was conducted on dry land in Gowa District, South Sulawesi, using a single location approach. Soil types in Gowa District are classified as Alfisols. The aims of this research are to determine the critical values of P and K for maize; and also, to know P and K fertilization of maize on various extraction and nutrient classes of artificial soil. Treatments were arranged as a split-plot in randomized complete block design with three replications. The main plot was artificial soil nutrient classes (very low, low, moderate, high, and very high of P and K) and subplot were fertilization of P and K. The results indicated that the critical values of P and K for maize on Alfisols (Typic Rhodustalfs) are 0.32 ppm P, 85 mg P100 g-1, 0.42 ppm P, and 1.04 ppm P for each Mechlish, HCl 25%, Bray-1, and Bray-2 extractions, respectively, and 0.37 me K 100 g-1, 0.55 me K 100 g-1, 178 ppm P, 213 ppm P for each NH4OAc pH 4.8, NH4OAc pH 7, Bray-1, and Olsen extractions, respectively. P and K fertilization, which gives the highest of maize yield, is obtained of 40 kg P, 80 kg P and 160 kg P ha-1 for the high class, moderate class, and low class of P. While for K fertilization, the highest yield was 20–40 kg K, 40–80 kg K and 80–160 kg K ha-1for the high, moderate and low class of K, respectively.
Keywords: Critical values, P and K fertilization, maize, artificial soil nutrient classes, Alfisols