The effect of organic matter, K fertilizer and different source of P on increasing Ultisol productivity in Lampung
1997
Mulyadi (Instalasi Penelitian dan Pengkajian Teknologi Pertanian, Yogyakarta (Indonesia)) | Purnomo, J.
In Indonesia, upland area with slope less than 8 percent is about 48.5 million ha. Almost 16.2 million ha is dominated by Ultisol and Oxisol. These soils are acid soil with low productivity. To increase productivity of the acid soil has been studied application of organic matter, K fertilizer and source of P. The experiment was arranged by using split plot design with 3 replications. The main plot was four addition of organic matter and K fertilizer: (A) without organic matter and K (B) without organic matter with K (C) with organic matter without K and (D) with organic matter and K. Source of organic matter was biomass alang-alang and source of K was KCl. The sub plot was four different P sources: (1) TSP, (2) Ciamis rock phosphate (RP), (3) NC RP and (4) Christmas RP and (5) Without P. A corn variety Arjuna was used as a crop indicator. The result showed that at depth of-0-20 cm, soil has characteristic as followed: texture is sandy clay loam, low pH, P, K and organic matter content, but high Al saturation. Among those constraints, P content was critical factor for plant growth. Application of 60 kg P/ha increased seeds corn yield about 14 to 17 folds better than without P treatment. Rock phosphate with high soluble P in mineral acid (TSP and Ciamis RP) was better in increasing crop yield than rock phosphate with low soluble in mineral acid. In addition of RP Ciamis and TSP did not show significantly different in improving corn yield. At the rate of 60 kg P/ha, the application of 5 t/ha organic matter and 200 kg KCl/ha did not increasing
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