Sukristiyonubowo Sukristiyonubowo
Indonesian Soil Research Institute

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SEDIMENT TRAPPING BY TERRACED PADDY FIELD ON SLOPPING AGRICULTURAL LAND Sukristiyonubowo, Sukristiyonubowo; Gabriels, D.; Verlooc, M.
Indonesian Journal of Agricultural Science Vol 11, No 2 (2010): October 2010
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

Terraced paddy field is not only important for rural food security, but also for trapping sediment in the slopping land. The aims of this research were to quantify the amount of incoming and outgoing sediments and to study sediment movement behavior during harrowing and fertilizing under traditional irrigation of terraced paddy field system. This study was carried out at Keji Village, Semarang District, Central Java during two cropping seasons, a wet season 2003/04 and a dry season 2004. A paddy field with eight terraces was selected. The terraces were flat, different in size and descending to the river. Sediment samples were taken at harrowing and fertilizing activities. The results indicated that at harrowing, outgoing sediment was higher than incoming both during the wet and the dry seasons. About 0.53 and 0.27 t ha-1 day-1 of soil were eroded during harrowing in the wet and the dry seasons, respectively. However, a week before and after fertilizing, both in the wet and the dry seasons, the amounts of incoming sediment were higher than the outgoing one. In the wet season, the amounts of incoming sediments were three to four times higher than the outgoing one, both a week before and after fertilizing. During the wet season, about 0.31 and 0.34 t ha-1 day-1 of sediment was yielded a week before and after fertilizing, respectively. During the dry season, the incoming sediments were ten times higher than the outgoing one. On an average the sediment yields were about 0.07 and 0.08 t ha-1 day-1 a week before and after fertilizing, respectively. Terraces having greater areas deposited more sediment than those with smaller sizes. During a week before and after first fertilizing, the total amounts of incoming sediments were 6.44 and 1.19 t ha-1 for the wet and dry seasons, while that of outgoing sediments were 1.89 and 0.14 t ha-1 for the wet and dry seasons, respectively. This indicates that terraced paddy fields are not only producing rice, but also providing environmental service in term of sediment trapping. This external service minimizes sedimentation in the downstream.
Pengaruh Teknologi Pemupukan Terhadap Kwalitas Tanah, Pertumbuhan Dan Hasil Padi Varitas Ciherang Yang Ditanam Pada Sawah Bukaan Baru Di Dusun Kleseleon, Kabupaten Malaka, Nusa Tenggara Timur Sukristiyonubowo, Sukristiyonubowo; Riyanto, Damasus; Widodo, Sugeng
Jurnal Lahan Suboptimal : Journal of Suboptimal Lands Vol 8, No 1 (2019): JLSO
Publisher : Pusat Unggulan Riset Pengembangan Lahan Suboptimal (PUR-PLSO) Universitas Sriwijaya

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Abstract

Sukristiyonubowo et al, 2019. The Influence of Fertilizer Technologies on Soil Quality, Rice Growth and Biomass Production of Ciherang Vareity Cultivated in Newly Developed Lowland Rice Fields of Kleseleon, Malaka District. JLSO 8(1):1-10.Highly weathered and potential acid sulphate soils are granted for newly developed lowland rice. They have many short comings including low in major elements and Fe and Mn in toxic levels. Study on soil fertility, rice growth and biomass productions of Ciherang variety planted in newly developed lowland rice was conducted in Kleseleon Village, Malaka District in 2014. The aim of study was to know the effect of technologies on soil fertility properties, rice growth and biomass productions.The experiment was started in February 2014 and harvested in June 2014. Five promising treatments were studied including: Farmers Practices, Package A : NPK recommended rate + 3 tons compost, Package B : NPK recommended rate + 2 tons compost + Bio fertilizer, Package C: ¾ recommended rate + 3 tons compost + Bio fertilizer and Package D: NPK recommended rate + 2 tons compost + Bio fertilizer, in which N, P and K were split two times: 50 % given at planting time and 50 % at 21 DAP. Two kilo gram composite soils from five points and ring samples of 0-20 cm in depth were taken in February 2014 for analyzing chemical, physical and biological parameters, before soil ploughing. The results indicated that the soil quality of newly developed low land rice fields in Kleseleon was low. These technologies increased the soil fertility including soil pH, soil organic C, available P and K extracted with HCl 25 %. In addition, the best technology was observed in package B (NPK Recommendation rate + 2 tons organic fertilizer + Bio fertilizer/SMART, in which N and K fertilizer were applied 3 times: 50 % at planting, 25 % at 21 HST and 25% before flowering) for tillers number and rice biomass productions. The yield reached 5.88 ± 0.29 and 4.84 ± 0.47 tons ha-1 season-1 for rice grains and rice straw, respectively.
Aplikasi Biochar dan Pupuk Hayati Dalam Meningkatkan Kualitas Lahan Sawah Tadah Hujan Serta Produktivitas Padi di Gunungkidul Riyanto, Damasus; Widodo, Sugeng; Sukristiyonubowo, Sukristiyonubowo
Seminar Nasional Lahan Suboptimal 2018: Prosiding Seminar Nasional Lahan Suboptimal "Tantangan dan Solusi Pengembangan PAJALE dan Kel
Publisher : Seminar Nasional Lahan Suboptimal

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Riyanto et al, 2019. The Application of Biochar and Biofertilizer for Improving Rainfed Lowland and Rice Productivity on Gunungkidul Regency. pp. 206-215.Managing land resources and improving soil quality are currently urgent and very important for the sustainability of the next generations. Improvements in the quality of rainfed rice fields can be carried out, among others, by application of biofertilizers and biochar. Biofertilizer is a group of living organisms whose activities can improve soil fertility. Biochar is a solid material obtained from the carbonization process of a biomass of agricultural or plantation waste.  The objective of this research was to study the effect of biofertilizer and biochar on availability of N, P, K and C-organic and rice production. The assessment of the application of biological and biochar fertilizers was carried out in the rainfed rice fields of Wareng village, Wonosari district - Gunungkidul regency. The time of implementation was planting season II (February-June 2017) with the treatments: (A) Control (without biological fertilizer and biochar) +100% chemical recommendations fertilizer (Urea 175 kg / ha + NPK 235 kg / ha), (B) Application of Biofertilizer (Agrimeth) 400 gr / ha, without biochar + 100% chemical recommendations fertilizer (C) Application of Biofertilizer (Agrimeth, without biochar and 50% chemical recommendations fertilizer (D) Application biochar rice husk charcoal 2.0 tons /ha, without biological fertilizer and chemical fertilizer 100% recommendation, (E) Application of Biofertilizer (Agrimeth), and biochar 2 t / ha + 100% chemical recommendations fertilizer (F) Application of Biofertilizer (Agrimeth), and biochar 2 t/ha and 50% chemical recommendation fertilizer. Each treatment was repeated 4 times with the farmer as a replication. The experimental design used RCBD (Randomized Complete Block Design) with 4 times replications. The size of the plot followed the size of farmer ownership (On Farm Reserach). The research was shown that the application of Agrimeth biofertilizers and biochar of rice husk charcoal about 2 ton / ha gives a significant effect on the increase of  Milled Rice  production compared to without biofertilizer and biochar. The reduction of inorganic fertilizers by 50% Ponska has no significant effect with the application of 100% recommended  chemical fertilizers if added with the application of Agrimeth and biochar as much as 2 tons / ha. This indicates that the application of Agrimeth biofertilizer on rainfed lowland rice can increase NPK nutrient uptake while the application of rice husk biochar can increase the C-organic content and stimulate the biological activity of paddy soil and reduce the use of NPK inorganic fertilizers. The availability of NPK elements after application with rice husk biochar and Agrimeth biofertilizer showed that the total N content increased by 22.17%, available P and available K increased by 30.19% and 40.09% respectively compared to controls (treatment of local Farmers ) Likewise, the yield of Milled Rice (MRY) increased with the application of a of biochar and biofertilizer by 37.98%, whereas with a single application (only biochar or biofertilizers) only increased between 14.22-20.16% compared to treatment control.