Abstract
Development of acid upland in Indonesia still has constraints. To solve the constraint, environmental friendly technology by using organic matter and beneficial microbes is necessary. This study aimed to determine the effectiveness of bio-organic fertilizer formulas for increasing productivity of upland rice plant in acid upland. This study used a randomized block design with 11 treatments using un-treatment as a control and some combination of NPK and bio-organic fertilizer. Each treatment was repeated three times, the size of plot was 5 m x 5 m. Upland rice var. Situ Patenggang was used as a plant indicator, with cultivication spacing of 40 cm x 15 cm. Combination treatment of NPK and bio-organic fertilizer increased population of P-solubilizer and N-fixer bacteria, plant height and tillers. Treatments of NPK-rec, ¾ NPK-rec and combination of ½ NPK-rec, ¾ NPK-rec and NPK-rec with both bio-organic formulas gave the weight of dried unhusked upland rice equal was 1.92 to 2.56 t ha-1 significantly higher compared to the control. The highest RAE was generated by treatment of NPK-rec combined with Bio-Organic Formula II about 137%. Bio-Organic Formula II could increase the growth and productivity of upland rice var. Situ Patenggang and could increase the efficiency udeof ½ NPK fertilizer dosage recommendations or equivalent with 125 kg urea, SP-36 100 kg, and 35 kg KCl ha-1 and increased the dehydrogenase activity.
Highlights
rationale dosage of ameliorants and fertilizers (RDAF) treatment as compared to the control soil, indicating the occurrence of an in situ soil Cd inactivation and plant element selective-uptake phenomenon
Multiple regression analysis that incorporating all 36 data pairs resulted in the following equations: (1) soil CdNH4OAc-EDTA = – 0.18 pHH2O + 0.21 PBray#1 + 0.51 organic-C – 0.57 exch.-Mg + 0.65
Cd (R2 = 0.76), and (2) Cd = 0.08 N – 0.17 K – 0.19 Mg – 0.24 P + 0.27 S – 0.41 Ca (R2 = 0.54, 3 aqua regia ps ps ps ps ps ps ps outliers removed). These results suggest that a proper amelioration and fertilization program may be prospective to be recommended as a low-cost Cd pollution remediation strategy for arable soils
Summary
Contoh tanah komposit Aluvial Coklat Kekuningan (Fluventic Eutrudept) berbahan induk aluvium dari napal, batukapur dan batuliat (Lembaga Penelitian Tanah, 1979) diambil pada lapisan 0-20 cm di lahan pertanian di kawasan industri Cileungsi (Desa Gunung Putri, Kecamatan Gunung Putri, Kabupaten Bogor). Tanaman uji yang digunakan adalah tomat dataran rendah (Lycopersicon esculentum M.) varietas Mutiara. Benih diperoleh dari Balai Penelitian Tanaman dan Sayuran (Balitsa), Lembang. Untuk perlakuan ameliorasi dan pemupukan digunakan dolomit (CaMgCO3), pupuk kandang kotoran (pukan) sapi, Urea, ZA, SP-36 dan KCl, sedangkan untuk pengkayaan kadar Cd tanah digunakan 3CdSO4.8H2O (p.a. Merck). Pupuk SP-36 yang digunakan mengandung 3.7 mg Cd kg-1, sedangkan kadar Cd dalam bahan lainnya tidak terukur
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