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390 Subandi, A.F. Fadhly alld E.G. MomualTable 5.Effect of K (KCI) application on yield of maize KCI use efficiency in severallocationsNo. Location Land type Source of data Rate ofTSP(kg/ha)Grain yield TSP use efficiency(kg/ha) (kg grain/kg KCl)1. Ngawi(East Java)- Rainfed Suyamto et al.wetland (1994)- VertisollGrumusol- Exch.K: 0,24 mlllOO g of soilo1002003004204,1404,1604,340372018,7013.072. Lampung(Sumatra)- Upland- may be- Ultisol/Podzolic(Acid soil)Hardjosumadi et al.e1(89)o503,6004,40016,03. Pagu, Kediri(East Java)- Upland- VolcanicIspandi danSoepangat (1986)o501005,0715,1075.1750.721044. Purwodadi(Central Java)- Heavy soilSudaryono et al.(1989)o502,4002,5002.005. Watuliwung,Sikka(East usaTenggara)- Upland- EntisollAlluvial- VolcanicSudaryono et ai,(1996)o1003.7804040o2.606. Watumilok, Sikka(East NusaTenggara)- Upland- Entisol/Alluvial- VolcanicSudaryono et a1.( 1996)o1006,3906,6702.807. Wollangi. Bone(South Sulawesi)- Upland- Alluvial- Exch.K:0,37 mellOO gof soilAkil and Rauf(1987)o1002003003,4403.8903,8103,7904.51851.17Kinds and Residual Effect of FertilizerThe use of effective and cheaper fertilizers is a strategic effort to increase maize yield andfarmer income. On UltisoI. Oxisol, and Inceptisol soils which have pH less than 5.5, phosphate rocksas P source were as effective as TSP for maize crops (Figure 2). Generally North Caroline PhosphateRock (NCPR) i.e, grounded (gNCPR) and ungrounded (ugNCPR), and grounded Jordan PhosphateRock (gJPR) were almost, or as effective as TSP.