Bahan kajian MK. STELA.smno, jtnh fpub Mei 2014

EVALUASISUMBERDAYA LAHAN

INDEKS STORIE

Diunduh dari Sumber: http://en.wikipedia.org/wiki/Storie_index.................... 3/11/2012 .

The Storie index is a method of soil rating based on soil characteristics that govern the land's potential utilization and productivity capacity. It is independent of other physical or economic

factors that might determine the desirability of growing certain plants in a given location.[1]

The evaluation is easy to be realized, being this an advantage of this method.A variety of categories are comprised in few categories.

Four or five parameters are evaluated:A: Soil depth and texture;

B: Soil permeability;C: Soil chemical characteristics;

D: Drainage, Surface runoff;E: Climate (only if it is not homogeneous, if so than it should not be included in the formula);

The index is calculated from the multiplication of these parameters, that is: Sindex = A x B x C x D x E

The disadvantage of this method is that if we have a value of zero in any category, than the result will be zero and won't be suitable for using.

STORIE INDEX

STORIE INDEX RATING SYSTEM

The Storie Index Rating system ranks soil characteristics according to their suitability for agriculture from Grade 1 soils (80 to 100 rating),

which have few or no limitations for agricultural production to Grade 6 soils (less than 10), which are not suitable for agriculture.

Under this system, soils deemed less than prime can function as prime soils when limitations such as poor drainage, slopes, or soil

nutrient deficiencies are partially or entirely removed.

The six grades, ranges in index rating, and definition of the grades, as defined by the NRCS, are provided below in Table Storie Index Rating

System.

Diunduh dari Sumber: http://www.ci.oakley.ca.us/UserFiles/File/planning/RiverOaksCrossing%20Revised/3.9_Agricultural%20Resources_final.pdf.................... 5/11/2011 .

Storie Index Rating System …

Diunduh dari Sumber: .................... 5/11/2011 .

Rating soils for agricultural, forest and grazing use. STORIE, R. E.

Journal Transactions 4th Int. Cong. Soil Sci. 1950 Vol. 1 pp. 336-339 …

. The Storie Index, a general soil-rating system of particular use in evaluating soils from an agricultural standpoint for tax assessment, land appraisal and general land-use planning purposes,

is obtained by the multiplication of the per cent ratings given to FACTORS:1. A, the soil-profile depth and permeability; 2. B, texture; 3. C, slope and 4. X, factors modifiable by management, namely drainage, salinity or alkalinity, nutrient level,

acidity, erosion and micro-relief.

The crop-productivity rating of a soil type is based on its yield as compared with that of the soil types giving the highest yield under stated management practices and climatic conditions, and is

expressed in ratios from 10 to 1 (that is 100% to 10% of highest yields). A given soil type may have one rating when undrained, another when drained and a third when d "a

ned and fertilized and so on.

Timber soil ratings are similarly handled but where production is unknown, they are worked out bλ multiplying the ratings for factors A, depth and texture; B, permeability; C, chemical properties such

as salinity; D, drainage and runoff and E, climate, including rainfall, temperature, aspect.

Diunduh dari Sumber: http://www.cabdirect.org/abstracts/19511900206.html;jsessionid=C0E71A3FA5EEDD62EF48270B1D7C59AA

.................... 5/11/2011 .

. Storie Index Rating System…

The Storie Index Rating System ranks soil characteristics according to their suitability for agriculture from Grade 1 soils (80 to 100 rating), which have few

or no limitations for agricultural production, to Grade 6 soils (rating of less than 10), which are not suitable for agriculture.

Under this system, soils deemed less than prime can function as prime soils when limitations such as poor drainage, slopes, or soil nutrient deficiencies are

partially or entirely removed.

The six grades, ranges in index rating, and definition of the grades as defined by the Natural Resources Conservation Service are provided below in Table.

Diunduh dari Sumber: ftp://ftp.co.imperial.ca.us/icpds/eir/east-brawley-geothermal/07ag-resources.pdf .................... 5/11/2011 .

STORIE INDEX RATING SYSTEM…

Gradre Index Rating Definition

1 – Excellent

80 through 100

Soils are well suited to intensive use for growing irrigated crops that are climatically suited to the region.

2 – Good 60 through 79

Soils are good agricultural soils, although they may not be so desirable as Grade 1 because of moderately coarse, coarse, or gravelly surface soil texture; somewhat less permeable subsoil; lower plant available water holding capacity, fair fertility; less well drained conditions, or slight to moderate flood hazards, all acting separately or in combination.

3 – Fair 40 through 59

Soils are only fairly well suited to general agricultural use and are limited in their use because of moderate slopes; moderate soil depths; less permeable subsoil; fine, moderately fine, or gravelly surface soil textures; poor drainage; moderate flood hazards; or fair to poor fertility levels, all acting alone or in combination.

4 - Poor 20 - 39 Soils are poorly suited. They are severely limited in their agricultural potential because of shallow soil depths; less permeable subsoil; steeper slope; or more clayey or gravelly surface soil textures than Grade 3 soils, as well as poor drainage; greater flood hazards; hummocky micro-relief; salinity; or fair to poor fertility levels, all acting alone or in combination.

5- Very Poor 10 - 19 Soils are very poorly suited for agriculture, are seldom cultivated and aremore commonly used for range, pasture, or woodland.

6 – Non-agricultural

less than 10 Soils are not suited for agriculture at all due to very severe to extreme physicallimitations, or because of urbanization.

Source: USDA-NRCS 2010

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

Faktor A : Rating karakter fisik profil tanah

I Tanah-tanah aluvial muda yang profilnya belum berkembang 100 %

x Fase dangkal (pada material bahan induk yang konsolidated) --- kedalaman 2 feet

50-60

x Fase dangkal (pada material bahan induk yang konsolidated) --- kedalaman 3 feet

70

g Subsoil sangat berkerikil 80-95

s Subsoil liat terstrata 80-95

II Tanah-tanah aluvial muda yang profilnya baru-sedikit berkembang 95-100 %

x Fase dangkal (pada material bahan induk yang konsolidated) --- kedalaman 2 feet

50-60

x Fase dangkal (pada material bahan induk yang konsolidated) --- kedalaman 3 feet

70

g Subsoil sangat berkerikil 80-95

s Subsoil liat terstrata 80-95

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

Faktor A : Rating karakter fisik profil tanah

III Tanah-tanah aluvial yang PERKEMBANGAN profilnya moderat (subsoilnya agak padat)

80-95 %

x Fase dangkal (pada material bahan induk yang konsolidated) --- kedalaman 2 feet

40-60

x Fase dangkal (pada material bahan induk yang konsolidated) --- kedalaman 3 feet

60-70

g Subsoil sangat berkerikil 60-90

IV Tanah-tanah yang profilnya sudah berkembang (Subsoiolnya liat rapat /padat) 40-80 %

V Tanah-tanah yang profilnya mempunyai subsoil cadas (hardpan) pd kedalaman kurang dari 1 foot

5-20 %

Pada kedalaman 1-2 feet 20-30

Pada kedalaman 2-3 feet 30-40

Pada kedalaman 3-4 feet 40-50

Pada kedalaman 4-6 feet 50-80

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

Faktor A : Rating karakter fisik profil tanah

VI Tanah-tanah yang subsoilhya liat rapat terletak pada bahan induk yang konsolidated (moderat konsolidated)

40-80 %

VII Tanah-tanah pada dataran upland yang batuan induknya berupa batuan beku yang keras pada kedalaman kurang dari 1 foot

10-30 %

Pada kedalaman 1-2 feet 30-50

Pada kedalaman 2-3 feet 50-70

Pada kedalaman 3-4 feet 70-80

Pada kedalaman 4-6 feet

Pada kedalaman lebih dari 6 feet

80-100

100

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

VIII Tanah-tanah pada dataran upland yang bahan induknya berupa batuan sedimen yang konsolidated pada kedalaman kurang dari 1 foot

10-30 %

Pada kedalaman 1-2 feet 30-50

Pada kedalaman 2-3 feet 50-70

Pada kedalaman 3-4 feet 70-80

Pada kedalaman 4-6 feet

Pada kedalaman lebih dari 6 feet

80-100

100

IX Tanah-tanah pada dataran upland yang bahan induknya berupa material lunak yang konsolidated pada kedalaman kurang dari 1 foot

20-40 %

Pada kedalaman 1-2 feet 40-60

Pada kedalaman 2-3 feet 60-80

Pada kedalaman 3-4 feet 80-90

Pada kedalaman 4-6 feet

Pada kedalaman lebih dari 6 feet

90-100

100

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

FAKTOR B. RATING BERDASARKAN TEKSTUR TANAH LAPISAN ATAS

Tekstur Medium: Lempung berpasir halus 100%

Lempung 100

Lempung debu 100

Lempung berpasir 95

Lempung liat berdebu, berkapur 95

Lemp. Liat berdebu, non kapur 90

Lemp. Liat berkapur 95

Lemp. Liat tidak berkapur 85-90

Tekstur halus atau berat

Liat berdebu, sangat berkapur 70-90

Liat berdebu, tidak berkapur 60-70

Liat, sangat berkapur 70-80

Liat tidak berkapur 50-70

Tekstur Kasar atau ringan:

Lempung berpasir kasar 90

Pasir berlempung 80

Pasir snagat halus 80

Pasir halus 65

Pasir 60

Pasir kasar 30-60

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

FAKTOR B. RATING BERDASARKAN TEKSTUR TANAH LAPISAN ATAS

Berkerikil

Lempung berpasir halus berkerikil

70-80

Lempung berkerikil 60-80

Lempung debu berkerikil 60-80

Lempung perbasir berkerikil 50-70

Lemp. Liat berkerikil 60-80

Liat berkerikil 40-70

Pasir berkerikil 20-30

Berbatu

Lempung berpasir halus berbatu 70-80

Lempung berbatu 60-80

Lempung debu berbatu 60-80

Lempung perbasir berbatu 50-70

Lemp. Liat berbatu 50-80

Liat berbatu 40-70

Pasir berbatu 10-40

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

FAKTOR C. RATING BERDASARKAN KEMIRINGAN

A Hampir datar (kemiringan 0-2%) 100%

AA Agak berombak (kemiringan 0-2%) 95-100

B Agak miring (kemiringan 3-8%) 95-100

BB Berombak (kemiringan 3-8%) 85-100

C Miring (kemiringan 9-15%) 80-95

CC Bergelombang (kemiringan 9-15%) 80-95

D Sangat miring (kemiringan 16-30%) 70-80

DD Berbukit (kemiringan 16-30%) 70-80

E Curam (kemiringan 30-45%) 30-50

F Sangat curam (kemiringan lebih dari 45%) 5-80

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

FAKTOR X. RATING BERDASARKAN FAKTOR LAINNYA, SELAIN FAKTOR A, B, DAN C.

Drainage

Baik 100%

Cukup baik 80-90

Tergenang moderat 40-80

Tergenang parah 10-40

Subyek banjir variabel

Alkali

Bebas alkali 100%

Sedikit terpengaruh alkali 60-95

Pengaruh moderat 30-60

Pengaruh agak parah 15-30

Pengaruh parah 5-15

Unsur Hara (kesuburan)

Tinggi (subur) 100%

Cukup 95-100

Miskin 80-95

Sangat miskin 60-80

Kemasaman

Sesuai dnegan pH 80-95%

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

FAKTOR X. RATING BERDASARKAN FAKTOR LAINNYA, SELAIN FAKTOR A, B, DAN C.

Erosi tanah: Tidak ada – Ringan 100%

Deposisi berbahaya 75-95

Erosi permukaan moderat 80-95

Alur dangkal jarang 70-90

Erosi permukaan moderat dg alur dangkal 60-80

Alur dalam 10-70

Erosi permukana moderat dg alur dalam 10-60

Erosi permukaan parah 50-80

Erosi permukaan parah dg alur dangkal 40-50

Erosi permukaan parah dg alur dalam 10-40

Erosi sangat parah 10-40

Erosi angin moderat 80-95

Erosi angin parah 30-80

Relief mikro:Smooth

100%

Channel 60-95

Hogwallow 60-95

Low hummock 80-95

High hummock 20-60

Dunes 10-40

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978

SOIL RATING CHART.Storie soil index rating = Faktor A x Faktor B x Faktor C x Faktor X

SOIL GRADING

GRADE 1 (Excelent)

Tanah-tanah yang mempunyai rate 80-100% dan cocok untuk berbagai jenis tanaman, tanaman pangan, perkebunan dan hutan

GRADE 2 (Good)

Tanah-tanah yang mempunyai rate 60-79% dan cocok untuk banyak jenis tanaman. Hasil tanaman umumnya baik hingga sangat baik

GRADE 3 (Fair)

Tanah-tanah yang mempunyai rate 40-59% dan kualitasnya cukup baik, cocok bagi cukup banyak jenis tanaman, Hasil jenis tanaman tertentu cukup baik

GRADE 4 (Poor)

Tanah-tanah yang mempunyai rate 20-39% dan mempunyai peluang terbatas bagi pertanian, misalnya beberapa tanah cocok untuk sawah

GRADE 5 (Very Poor)

Tanah-tanah yang mempunyai rate 10-19% dan penggunaan pertanian snagat terbatas, kendala serius seperti solum dangkal, berbatu, atau alkalis

GRADE 6 (Non-agriculture)

Tanah-tanah yang mempunyai rate kurang dari 10% dan faktor pembatasnya snagat serius, seperti sangat curam, pasang-surut, lembah banjir.

Sumber: Storie Index Soil Rating. R.E. Storie. Experiment Station Berkeley, Univ oc California. 1978