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Bambang Siswanto
Program Studi Agroteknologi, Fakultas Pertanian, Universitas Tribhuwana Tunggadewi

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SEBARAN UNSUR HARA N, P, K DAN PH DALAM TANAH Bambang Siswanto
BUANA SAINS Vol 18, No 2 (2018)
Publisher : Universitas Tribhuwana Tunggadewi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (579.461 KB) | DOI: 10.33366/bs.v18i2.1184

Abstract

Soil nutrient availability maps are needed to be used as a basis for managing fertilizer use, as well as soil acidity (pH) values. If the nutrient status of N, P, K and soil acidity is known, it is expected that the dosage of fertilization of each land can be done in accordance with thenutrient status. It can also reduce the cost of fertilization. This study aims to determine the factors of land affecting the distribution of nutrients N P K and soil pH. The research was conducted in Gugut Village, Rambipuji District, Jember from June to August 2016. The research was conducted by using free grid survey method with semi-detailed survey rate of 1: 25.000 scale. The distribution pattern of each nutrient status was analyzed by matrix method approach to find out the factors that most influence the distribution of nutrients N, P, K and pH.  From the result of research, map of nutrient distribution of N, P, K is almost similar to the result of geological map overlay, landform, land use and altitude. According to Wilding and Drees (1983), the diversity of nutrient status can be due to differences in lithology / parent material, climate, erosion, biological influences, and hydrology. The N, P, K soil availability map only meets 32.76% of the elevation map section. Therefore, the temporal nutrient status mapping can not be generated based on existing land map units so it is advisable to use the rigid grid method. While soil pH maps are almost similar to overlays between geological maps, landforms, land use and climate.
EVALUASI KESESUAIAN LAHAN TANAMAN JAGUNG, KUBIS, KENTANG DAN WORTEL DENGAN MENGGUNAKAN PROGRAM ALES (Autometed Land Evaluation System) Bambang Siswanto; Wahyu Fikrinda
BUANA SAINS Vol 17, No 2 (2017)
Publisher : Universitas Tribhuwana Tunggadewi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (662.845 KB) | DOI: 10.33366/bs.v17i2.811

Abstract

The increasing need of land from year to year results in the narrowness of fertile and potential agricultural land. This condition causes an imbalance of land use, which can directly harm the agricultural sector. To be able to utilize land resources in a directed and efficient manner, it is necessary to provide complete data and information about land characteristics and land use requirements that will be cultivated. Information in the form of land characteristics and land use requirements is needed in land evaluation activities. Land evaluation conducted by using ALES program (autometed land evaluation system), in addition to facilitate the process can also be used for the evaluation of land economically. To evaluation land physical and economical for maize, cabbage, potato and carrot in Tulungrejo, Batu. This research was conducted in Tulungrejo Substrict region in Tulungrejo, Batu observation map plan soil and economic social data processing, evaluation model on ALES program. The research result was 17 soil mapping unit (SMU) according to soil survei result which consist of soil taxonomi with its spread SMU 1 Andic Dytrudepts, SMU 2 Andic Dystrudepts and Typic Melanudands, SMU 3 Andic Dystrudepts and Typic Melanudans, SMU 4 Typic Melanudands, SMU 5 Andic Dystrudepts and Typic Melanudands, SMU 6 Humic Pachic Dystrudepts, SMU 7 Ruptic Alfic Dystrudepts, SMU 8 Andic Dystrudepts, Tupic Dystrudepts and Typic Melanudands, SMU 9 Typic Hapludans, SMU 10 Typic Melanudands, SMU 11 Typic Hapludands and Andic Hapludolls, SMU 12 Typic Hapludands and Humic Dystrudepts, SMU 13 Typic Hapludands and Inceptic Hapludalfs, SMU 14 Typic Hapludolls, SMU 14 Typic Hapludolls, SMU 15 Typic Hydrudands, SMU 16 Typic Melanudands and Andic Dystrudepts, SMU 17 Typic Udipsamments. Generally the ALES physical land suitability result for maize: S3-eh/nf/nr/rc, S2-nr/rc/wa, S3-oa and N-oa, cabbage S3-eh, S3-eh/nr, S3-nf, S3-rc and N-oa, potato S2-eh/nr, S2-nf, S3-nr, S3-oa and N-oa while for carrot S3-nf , N-eh. Economical land suitability value of maize, cabbage and potato on N1, N2 and S3 while for carrot is S1 because nothing limited class. General the ALES economical suitability result was profitable because there ware no negative (-) economical matric value.