Pengamh cara inkubasi, pengapuran dan pemupukan fosfor terhadap tanaman jagung ( Zea ntays L. ) pada tanah Hapludult ( Podsolik ) Gajrug

Abstract

The aim of this research are to study the methods of phosphorus fertilization on any lime doses and the lime and phosphor incubation method on corn plant ( Zen mays L. ) on Hapludult ( Podsolik Gajrug ). Experimental design used in this research is Split Plot Design with lime factors on 4 grade as follow KO= Ox, K1= 25%, K2= 50% equal to exchangeable-Al, 100% equal to exchangeable-At, and with phosphorus factors on 1.24 g and K3 = TSPIpot, 3.37 g rock phosphatelpot, and 1.04 g mono-calcium phosphatelpot equal to 50 ppm P application. Initial fertilizer used are ZA with 100 ppm N doses (2.4 g ZAIpot) and KC1 with 100 ppm K doses (1 g KCVpot). Duncan test was established whether to understand the effect of each treatment or combination of some treatment. The lime treatment which was done earlier then incubated for one week are significantly higher to the lime and phosphorus fertilization that were done at the same time but incubated for two weeks on the corn dry mass and pH. Content and uptake of phosphorus in the second incubation are higher than the first incubation. Lime increasing doses significantly increase the corn dry mass, pH and phosphor uptake but decrease the exchangeable-Al. The treatment of 25% lime equal t o exchangeable-Al cause the highest plant phosphorus content compare to no lime, 50% lime application, and 100% lime application equal to exchangeable-Al treatment. Lime treatment did not give significant effects to the CEC and available P. The phosphate mono-calcium treatment significantly higher than TSP and rock phosphate on pH value. The phosphate mono-calcium treatment cause higher plant phosphorus content and phosphorus uptake compare to the TSP and rock phosphate treatment. Treatment of TSP, rock phosphate and phosphate monocalcium were not significantly different on corn plant dry weight, exchangeable Al, CEC and available phosphate. The treatment of 100% lime equal to exchangeable-& that was done earlier then add by TSP significantly higher than other combination treatments to the corn dry mass. The treatment of 100% lime equal to exchangeable-& that was done earlier then add by rock phosphate significantly increase pH value higher than other combination treatments. Combination treatment on 100% lime equal to exchangeable-& with TSP that were done on the same time gave the lowest pH value compare to other combination treatment.