Jurnal Ilmiah Agropolitan, Vol 4 No 2, September 2011: 504-512


Staf Pengajar Program Studi Agroteknologi Universitas Negeri Gorontalo


Banana is one of the export commodities important, but most farmers were cultivated as a side commodity only. The objective of the study was to evaluate the land suitability for banana development and its limiting factors. This study was done with four stages, i.e data collection, laboratory analysis, data compilation, and data interpretation. Land suitability using matching approach and tools of geographical information system (GIS) software. Determining od land suitability classes using FAO (1976) framework od land evaluation. The result shown that land suitability for banana was classified as suitable (S) widely od 204,696.99 ha and widely of 13,999.53 ha od not suitable (N). The limiting factors for banana development were erosion jazard, water and oxygen availability, and root condition.

Keywords: Suitability, class, land, banana


Jurnal Ilmiah Agrosains Tropis, Vol 1 No 3, September 2006: 116-123

Zulzain Ilahude, Nurdin

Staf Pengajar Jurusan Teknologi Pertanian Fakultas Ilmu-Ilmu Pertanian Universitas Negeri Gorontalo


This study was carried out to alluvial landform of Tolongio Main Garden of Gorontalo Utara Regency of Gorontalo Province, at Agriculture Technology Laboratory of Agriculture Faculty, Gorontalo State University. Thr objective of this research was to determine the effect of Pelangi fertillizing on the production parameters and also to conduct the best dosage to obtain good responses on the production parameters of corn od Lamuru FM, Bisi-2 and Motor variety.The plot were arranged in a block design of split plot which where variety was a main plot with three treatments are Lamuru FM (V1), Bisi 2 (V2) and Motor (V3), while Pelangi fertilizer as a sub plot with fourth treatments are 0 kg/ha (PO0), 75 kg/ha (PO1), 150 kg/ha (PO2), 225 kg/ha (PO3) by three replications.This study showed that fertilizing Pelangi have significantly effect on the production parameters are plant age polination and grain weight of corn, however it was not significant on the plant heigth of corn. The recommended dosage and variety were 225 kg/ha (PO3) and Lamuru FM for production of corn, respectively.

Keywords: Alluvial, corn, production, fertilizing, optimum.



Jurnal Ilimah Agrosains Tropis, Vol 1 No 1, Januari 2006: 1-6

Nelson Pomalingo, Nurdin

Jurusan Teknologi Pertanian Fakultas Ilmu-Ilmu Pertanian Universitas Negeri Gorontalo


The rainfall, relative humidity and temperature data of North Isimu Area of Gorontalo Regency were collected for period 1961-2005. For land suitability purpose, the potential evapotranspiration is cumputed using Thorwhitw Methods. This area which has dry season of 3 month and growing period of 5 month is potential for development of the yearround of maize when correct planting time is properly carried out. The computation of water balance used as basic strategy for water management and crop calendars. Rainfall, relative humidity and temperature are component which determinees alnd suitability of maize. Land suitability analysis for maize development using category system based on limiting factor method. Then, the computation of comparative suitability value using Felozardo (1978) method. The result of this research has shown that land suitability classes for maize development based on climate factors are moderately suitable (S2). Then, the comparative suitability value of this area are 86.67%. The crop calendar for maize development at North Isimu Upland area is January until March as first cultivation and April until July as second cultivation. In soil factor are very supproting for maize developing at North Isimu Upland area.

Keywords: Land suitability, climate, maize, crop calendar, upland, Isimu Utara.


Dissertation, Post-Graduate Program, Agriculture Faculty, Brawijaya University, 2020



Maize became a National commodity strategic because in addition to a source of food, feed ingredients, and industrial raw materials also as an export commodity. Increased production of maize is the main indicators to the national maize self sufficiency programs. However, the achievement of increasing maize production has not been accompanied by an increase in maize productivity per unit area. In fact, the potential for achievement of maize productivity is still quite high. Generally, maize is still grown on land that these characteristics-and-quality are not suitable, so the national maize productivity is still low because the requirements for growing maize or the requirements for land use are not met. To assess the maize land suitability, the specific criterion of land suitability requirements also needed but until now the existing criteria are still for all maize varieties. Meanwhile, the agronomic and yield potential of local varieties, composite and hybrid varieties are different, so this research has conducted. 

Research aimed to: (1) study the land quality in the sustainable agricultural area of Gorontalo, (2) determine the quality of land to control maize production, (3) develop land suitability criteria for maize crops, and (4) assess land suitability for LUTs of maize in Gorontalo sustainable agricultural area. In order to achieve the research objectives, four sub-studies were carried out as follows: In the 1st sub-study, the researcher described the quality of land in each land mapping unit (LMU) based on morphology, physical properties, soil chemical properties, climate and terrain characteristics from soil survey and field observations, secondary data, and soil analysis results. in the laboratory. Furthermore, the land quality dignity of each LMU was determined using the land suitability criteria that has been built. In the second sub-study, researchers analyzed the quality of land that controls maize production using the structural equation model (SEM) method. In the third sub-study, researchers developed land suitability criteria for hybrid, composite and local varieties of maize using the boundary line method. In the fourth sub-study, researchers conducted land. suitability evaluation for each maize varieties based on the new criteria of land suitability using SPKL software and integrated with the GIS, as well as land suitability for maize crops economically.

The first study results that the land quality of temperatures is quite hot to hot, the availability of water (rainfall, wet months and dry months) belongs to the E3, E2 and D2 agro-climatic zones with LGP classified as planting intensity II and II, oxygen availability is dominated by drainage class. rather slow, rooting medium (dominant texture of clayey clay, slightly coarse material, and moderate dominant effective depth), nutrient retention (pH dominant slightly acidic, dominant C-Organic very low, CEC and moderate dominant base saturation), available nutrients (N total and available P) dominance is very low, exchangeable K is low dominant), moderate dominant sodicity, erosion hazard (dominant flat slope and heavy dominant soil erosion), flood hazard (dominant inundation height is very shallow and dominant inundation level is very short), and quality land preparation land is not rocky and dominant rock outcrops are absent. The dignity of land quality in the study area were predominantly quite good, while good land quality and poor land quality were relatively less consecutively, without of excellent land quality. The second study results that-the land quality that controlled the local maize productivity based on the order of importance were erosion hazard, available nutrients, root media, land preparation, oxygen availability, and nutrient retention. Land quality that controls of the composite maize productivity of based on the order of importance were nutrient retention, root media, land preparation, and available nutrients. The land quality that controls of the hybrid maize productivity based on the order of importance were root media, land preparation, erosion hazard, available nutrients, and the nutrient retention. The third study results that the land suitability criteria for local maize, composite and hybrid maize were less and were relatively location specific based on the characteristics and land quality and the productivity achieved. The land suitability criteria for local maize only consist of erosion hazard, available nutrients, rooting media, land preparation, oxygen availability, and nutrient retention. Meanwhile, the land suitability criteria for composite maize only consist of nutrient retention, root media, land preparation, and available nutrients. Meanwhile, the land suitability criteria for hybrid maize only consist of root media, land preparation, erosion hazard, available nutrients, and nutrient retention. The criteria that has been created were also more responsive to the characteristics and land quality in a specific location than t’he la’nd s’uitability criteria f’or local and composite mai’ze crops. I’n addition, th’e la’nd suit’ability crite’ria for hybrid maize crops that has been made have a lower interval value than the existing land suitability criteria for maize before. The fourth study results that-the economic suitability of LUT local maize with low input, medium input and high input was profitable, except for a small amount of land in the southern part which was not profitable and was not prioritized. Similarly, the LUT of composite maize and the LUT of hybrid maize with low, medium and high input inputs were relatively the same as the LUT of local maize.

The main priority for local maize development based on the order of the widest land distribution was Mootilango, Asparaga, Boliyohuto, Tolangohula and Bilato Districts., While the second priority were spread in Mootilango, Asparaga, Bilato, Boliyohuto, and Tolangohula Districts. The main priority for composite maize development based on the order of the widest land distribution were Asparaga, Bilato, Boliyohuto, Tolangohula and Mootilango Districts, while the second priority were spread in Mootilango, Boliyohuto, Tolangohula, Bilato and Asparaga Districts. The main priority for hybrid maize development based on the order of the widest land distribution were Asparaga, Boliyohuto, Mootilango and Bilato Districts, while the second priority were spread in Mootilango, Asparaga, Bilato, Boliyohuto and Tolangohula Districts.


Tesis, Program Studi Ilmu Tanah (TNH) Sekolah Pascasarjana Institut Pertanian Bogor (IPB) Tahun 2010



Efforts to increase and develop paddy soil other than irrigated paddy soil (IPS) are essential in order to improve rice production. Rainfed paddy soil (RPS) is the second granary national after IPS, although current productivity of RPS is low and it has complex limiting factor. The objective of this research were: (1) to study the development of RPS based on soil characteristics and genesis, (2) to identify the main factors influencing the formation of soil profiles, (3) to classify the soil according to Soil Taxonomy classification system, and (4) to evaluate land potency for rice and corn. The research was carried out on 9 pedons from lacustrine materials on E4 agroclimate zones. RPS and upland (UL) pedons are located in Sidomukti of Gorontalo Regency and Molombulahe of Boalemo Regency. While, the IPS pedon are Bandungrejo of Gorontalo Regency. Field observations were done throughout toposequent transect on the lower, middle and upper slope position. Soil samples taken from each horizon of each pedon for laboratory analysis. The observed parameters were morphological characteristics, physical, chemical and mineralogical properties of the soil. The data were analyzed with quantitative and qualitative analysis. Soils were classified based on Soil Taxonomy system, whereas land potentials were evaluate by land suitability analysis with the parametric approach. Land suitability classes (LSC) were determined by Square Root Land Index Method. The results of this study showed that all pedons have B horizon but IPS is more developed than the RPS and the UL. The IPS pedon is more weathered intensively than the RPS and the UL. The main genesis process in all pedon were eluviation, illuviation, lessivage, pedoturbation, braunification and gleization, except for UL pedon from Molombulahe that do not reflact gleization process. The main factors of soil formation were climate, age (time), topography and human activity. The soil classification of PNS1, PNM1 and PNM2 pedon were classified as Ustic Endoaquert, fine, smectitic, isohypertermic; PNS2 pedon classified as Vertic Endoaquept, fine, smectitic, isohypertermic; PNS3 pedon classified as Vertic Epiaquept, fine, smectitic, isohypertermic; PNS-LK pedon classified as Typic Eutrudept, fine loam, smectitic, isohypertermic; PNB pedon classified as Ustic Epiaquert, fine, mixed, active, isohypertermic; PNM3 pedon classified as Aeric Epiaquept, fine, smectitic, isohypertermic; and PNM-LK pedon classified as Typic Eutrudept, fine, smectitic, isohypertermic. The highest LSC of land utilization types (LUT) for local paddy was highly suitable (S1), while the lowest one was not suitable (Nna). The highest LCS of paddy-corn and paddy-corn-corn LUTs was marginally suitable with nutrient availability and water as a limiting factor (S3na and S3wa), while the lowest LSC was not suitable cause same limiting factors (Nna and Nwa). The potency of RPS similar to potency of IPS. The full recommendation of LUT were LUT of local paddy with B (100% of recommended dosage) and C pattern (prescription dosage), except for Inceptisol from Molombulahe consist of local paddy LUT to A (none fertilizing), B and C pattern. The Other LUTs were including requiring recommended and not recommended.

Keywords: Development, classification, land utilization types, land suitability classes, rainfed paddy soil, lacustrine.