PENGARUH PEMUPUKAN SEMI ORGANIK DENGAN BERBAGAI SUMBER PUPUK KANDANG TERHADAP SERAPAN N, PERTUMBUHAN, DAN HASIL TANAMAN JAGUNG (Zea mays L.)

The research was conducted because of the very high using of urea fertilizer by the farmers so there is inefective and inefficient. The expectation using of manure fertilizer are minimizing inorganic fetilizer especially N, available of macro and micro element, and finally maintain the biotic fertility. The main of the research is studying the effect of urea dose and kinds of manure fertilizer and they interaction to the N absorption, growth, and yield of Hybride Maize one ear. The research has been conducted from February untill July 2007, at Gonowelang, Ngaru aru village, Banyudono district, and Boyolali regency, on regosol soil type in elevation of 240 m above sea level. The research design is Randomized Completely Block Design (RCBD) in factorial consist of two factors treatment. The first factor is kinds of manure fertilizer (no manure fertlizer as control/K0, cow faeces/K1, chicken faeces/K2, and goat faeces/K3 manure fertilizer 3 tons/ha respectively), and the second one is urea dose (N0/No urea fertilizer as controll, N1/92 kg/ha, N2/184 kg/ha, and N3/276 kg/ha). Each of the combination factor was three times replicated. The result of the research could be concluded that (1) The interaction between kinds of manure fertilizer and urea fertilizer dose occur on the plant dry weight at 60 days age, the root dry weight at 60 days age, the leave area at 40 dats age, the leave are index at 40 days age, The relative growth rate at 60 and 80 dats age, and no interaction in N absorption (The difference of N absorption just on the urea dose and kinds of manure fertilizer separately) and no interaction in yield of maize (2) The best growth of maize P-11 hybrid was obtained by the combination treatment of cow manure fertilizer 3 tons/ha and urea fertilizer184 kg/ha (3) Also for the best quality of yield (1000 seed dry weight) and the highest production were obtained that dose