IARA Vol. XXVI No. 1 Year. 2009 (pdf, 1420 kb) - Pustaka Deptan

Indonesian Agricultural Research Abstracts Vol. 26, No. 1, 2009exchangeable Al (exch-Al). Objective of this research was to study the effect of crops residue compost onthe activities of exch-Al and soybean yield. A greenhouse experiment using Vertic Hapludult from Gajrug,Banten was conducted in a completely randomized design. The treatments were different crops residuecompost, i.e. of upland rice, corn, soybean and peanut having level of C-organic of 0, 1 and 2%. Soybeanwas used as indicator plant. Results of this experiment indicated that the application of different types ofcrops residue compost increased organic acids at different concentrations resulting different decrease ofexch-Al. The application of upland rice residue compost at level of 2% organic-C (D2) resulted in thehighest yield of dried soybean (23.21 g/pot) or increased up to 72.53%.030 WIHARDJAKA, A.Direct seeded rice crop response on NPK nutrition input at different toposequence position and itsinfluence to nitro-oxyde gas emission. Tanggap padi gogorancah terhadap masukan hara NPK padaposisi toposekuen berbeda dan pengaruhnya terhadap emisi gas nitro-oksida/Wihardjaka, A. (LokaPenelitian Pencemaran Lingkungan Pertanian, Jakenan (Indonesia)). Agrivita ISSN 0126-0537 (2006) v.28(2) p. 165-176, 3 ill., 5 tables; 14 ref.ORYZA SATIVA; DIRECT SOWING; NPK FERTILIZERS; NUTRIENT UPTAKE; TOPOGRAPHY;FERTILIZER APPLICATION; SOIL FERTILITY; PLANT RESPONSE; NITROUS OXIDE; SOILPOLLUTION.Direct seeded rice crop response to nutrients application under rainfed lowland rice soil is influenced bysome factors, i.e. soil fertility status, topography and agrohydrological conditions. Drought stress orchange of soil moisture content in a toposequence affects soil and crop productivities. A field experimentwas carried out in Jakenan's rainfed lowland rice area of Pati District to determine the response of directseeded rice crop to NPK fertilizers management in different position in a toposequence. The experimentwas arranged using randomized block design with six treatments namely check, NP, NPK, CR_NPK,NPKZn, farmyard manure at three locations namely upper, sloping, bottom toposequences. The significantresponse of direct seeded rice crop was observed at treated N plots. However, application of controlledreleaseof N fertilizer in CR_NPK treatment did not significantly yield high grains, especially in uppertoposequence. Nutrient uptake of NPK in bottom toposequence was higher than either upper or slopingtoposequences. Application of N fertilizer increased effectively grain yield and nutrient uptake of NPK,except nutrient uptake of NPK in bottom toposequence was higher than maximum NPK accumulationline. Controlled release of N fertilizer emitted nitrous oxide lower than prilled urea fertilizer. The bottomtoposequence position emitted nitrous oxide gas higher than upper and middle position of toposequenceF07 SOIL CULTIVATION031 AMBAR, S.Effect of tillage practices on soil erodibility in Jatiluhur footslope, West Java. Pengaruh pengolahantanah terhadap erodibilitas lahan di kaki lereng bukit Jatiluhur, Jawa Barat/Ambar, S. (UniversitasPadjadjaran Jatinangor, Sumedang (Indonesia). Fakultas Matematika dan Ilmu Pengetahuan Alam).Bionatura ISSN 1411-0903 (2006) v. 8(2) p. 107-121, 8 tables; 12 ref.JAVA; TILLAGE; EROSION; SOIL TYPES; SOIL CHEMICOPHYSICAL PROPERTIES; SOILSORPTION; INFILTRATION.The study of soils particularly in terms of soil erodibility was conducted to three land complexes in a partof Jatiluhur footslope, West Java. The objectives of study were to determine a relative soil erodibilityindices and the influence of soil types, ploughed and unploughed with remain shrub vegetal covers on soilproperties particularly those which might be related to soil erodibility. The study was also concerned withvariation of soils in the study area according to their erodibility. The parameters of erosion indicesmeasured and examined were water stable aggregate (WSA), particle size and stoniness, gravel size, crust15