An effort to increase the yield and reduce carbon loss from maize farming practices on Ultisols largely depend on fertilizer inputs and in situ crop residual management. The experiment aimed to estimate yields, biomass production and carbon dynamics of several management fertilization on maize farming practice on Ultisols has been conducted from March to July 2013 in Tamanbogo Experimental Farm, East Lampung. The experiment was set up as a randomized complete blockdesign, consisted of 6 treatments namely: 5 t ha -1 of cattle manure, 5 t ha -1 of dried sludge manure, and its combination with 200 kg urea ha -1 + 125 kg SP36 ha -1 + 50 kg KCl ha -1 (50% of recommended dose of inorganic fertilizers "RDIF") and 75% of RDIF. The experimental results revealed that application of combined organic with inorganic fertilizers increased the biomass production, carbon fixation, and grain yield significantly. More than 50% of produced biomass and fixed carbon (grain, maize cob, maize husk, stems and leaves) were removed from maize farming. The use of organic fertilizer combined with NPK fertilizer at 50% of RDIF can be applied to increase the biomass production, organic carbon fixation and maize grain yield in sustainable ways.
Maize farming on an acid upland soil generally gives high priority to the use of chemical/NPK fertilizers. Application of organic soil amendments and P (phosphate) solubilizing microbes in maize farming on an acid upland soil were expected to substitute the use of NPK fertilizer without reducing the yields. The research aims was to study the effectiveness of biochar, cow dunk and P solubilizing microbes applications to substitute NPK fertilizers application as shown on the growth and productivity of maize (var. P 27), Relatively Agronomic Effectivenes (RAE) and B/C ratio. The research was conducted from January to June 2014 on an acid upland soil at Tamanbogo Experimental Farm, East Lampung District using randomized block design with four replications. The treatment consisted of Control (T1), NPK fertilizer recommendation dose (T2); biochar 5 t/ha + 50% of NPK recommendation dose (T3); P solubilizing microbes 5 g/plant + 50% of NPK recommendation dose (T4); Cow dunk 5 t/ha + 50% of NPK recommendation dose (T5) and biochar 5 t/ha + P solubilizing microbes of 5 g/plant + cow dunk 5 t/ha + 50% of NPK recommendation dose (T6). The results showed that the combination of NPK fertilizer at a dose of 50% of NPK recommendation + cow dunk at a dose of 5 t/ha (T5), showed the best growth and productivity of P27 maize with B/C ratio of 2.10.
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