IMPROVEMENT CHEMICAL PROPERTIES OF OXISOL WITH HUMIC MATTER FROM SUB-BITUMINOUS TO INCREASE PRODUCTION OF UPLAND RICE
| Main Authors: | Herviyanti, Herviyanti, Gusnidar, Gusnidar, Harianti, M, Maulana, A |
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| Format: | Article NonPeerReviewed application/pdf |
| Subjects: | |
| Online Access: |
http://repository.unand.ac.id/24092/1/Agrivita.pdf http://repository.unand.ac.id/24092/2/1106-5682-4-ED%20%2C%20Agrivita.pdf http://repository.unand.ac.id/24092/ |
Daftar Isi:
- The objective of this research were : a) using low-rank coal (sub-bituminous) as main humic material sources because this material will not be anthracite, and cannot using to be an energy sources b) to examine residual effects of humic matter from sub-bituminous which was combined with P fertilizers to adsorp Al and Fe metal, improving soil fertility, and increasing P fertilizing efficiency and Oxisol productivity. Therefore, optimalization crop productivity of upland rice can be achieved. The experiment was designed using a 3 x 4 factorial with 3 replications in randomly groups design. The 1st factor was 3 ways incubating humate material with P-fertilizer, which are : I1 = Incubation of humate material 1 week, then incubation P-fertilizers 1 week; I2 = Incubation of humate materials and P fertilizers directly into the soil for 2 weeks; and I3 = humate material and P fertilizer mixed for 1 week, then incubation to the soil for 1 week. The 2nd factor was residual effects of humate material and P-fertilizer combination which are 4 doses H1 = 400 ppm (0.8 Mg/ha) + 100% R; H2 = 400 ppm + 75% R; H3 = 800 ppm (1.6 Mg/ha) + 100% R,; and H4 = 800 ppm + 75% R. The 2nd year research results showed that the best treatment was founded residue effect of 800 ppm humate material and 100% R P-fertilizer doses in I3 way incubation that is equal to 6.19 t ha-1 upland rice yield. However, this result is almost the same as residual effects of 800 ppm humate material + 75% R P-fertilizer doses and upland rice yield the 1st year . It was concluded that addition of humate material can given the efficiency of P-fertilizer using up to 25% until the 2nd season planted.