Soil and Land Assessment of the Southern Part of Flying Fox Station for Irrigated Agriculture. Part A: Land Resources and General Land Capability.
Agricultural Land Suitability Series, Report 14A
Andrews, K; Burgess, J; McGrath, N; Wright, A; Walton, S; Northern Territory. Department of Environment, Parks and Water Security
E-Publications; E-Books; PublicationNT; Technical Report No. 3/2021
Flying Fox Station; Roper River Region
This report presents findings from a 52 938 ha soil and land resource mapping investigation of the southern part of Flying Fox Station, in the Roper River Region of the Northern Territory. While the study area was primarily selected because of its diverse geology, terrain and soils, it is also representative of the central Roper River region, and findings from the investigation will underpin and guide future agricultural development in the region.
Made available by via Publications (Legal Deposit) Act 2004 (NT)
Executive Summary; 1. Introduction; 2. Previous land resource investigations; 3. Methodology; 4. Climate; 5. Geology; 6. Landscapes; 7. Land units; 8. Land capability assessment; 9. Land management; 10. References; Appendices.
soil survey; land resource assessment; land units; land capability assessment
Northern Territory Government
Technical Report No. 3/2021
208 pages : colour maps and illustrations ; 30cm
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=6589A5D125EFB385E050CD9B2144202B; https://hdl.handle.net/10070/820014 [Report_print_Soil Land Assessment Flying Fox - Part A Land Resources General Land Capability]; https://hdl.handle.net/10070/820013 [Report_screen_Soil Land Assessment Flying Fox - Part A Land Resources General Land Capability]; https://hdl.handle.net/10070/829192 [Soil and Land Assessment of the Southern Part of Flying Fox Station for Irrigated Agriculture. Part B: Digital Soil Mapping and Crop Specific Land Suitability]
Soil and Land Assessment of the Southern Part of Flying Fox Station for Irrigated Agriculture Part A: Land Resources and General Land Capability 103 Table 8.3 Spatial extent of land capability classes within the Flying Fox study area. Class Land Units Area (ha) Limiting constraints 1 - 0 - 2 8d 1 060 Minor gilgai (VI <0.3 m) and/or slope 1-2% and/or moderate soil drainage 2-4 (spatially variable) 7d1, 7d2 1 460 Subject to spatially variable constraints that include: slope 1->3% and/or negligible to extreme surface rock (0- >10% >60 mm) 3-4 (spatially variable) 8b, 8c 7 740 Subject to spatially variable constraints that include: negligible to minor gilgai (VI <0.3 m) and/or slope <1-3% and/or negligible to extreme sodicity (ESP <6->20%) and/or moderate to imperfect soil drainage and/or minor to extreme surface rock (1- >10% >60 mm) 4 (spatially variable) 9d, 9e1, 9e2 6 970 Subject to spatially variable constraints that include: regular flooding and/or negligible to severe gilgai (VI <0.30.6 m) and/or slightly to moderately saline (ECe 2-8 dS/m) and/or moderate sodicity (ESP 6-15%) and/or moderate to imperfect soil drainage and/or negligible to severe surface rock (0- >10% >60 mm) 4 1a, 2c, 5a, 5b, 5c, 5d, 6b, 6c 23 080 Slope >3% and/or soil depth (<0.25 m) and/or severe to extreme surface rock (2- >10% >60 mm) 9a, 9c1, 9c2, 9c3, 10e, 11e 12 690 Regular to frequent flooding and/or negligible to extreme microrelief (VI <0.3- >0.6 m) and/or non-saline to moderately saline (ECe <2-8 dS/m) and/or slopes 1- >3% on streambanks and/or negligible to extreme sodicity (ESP <6>20%) and/or moderate to poor soil drainage 8.3.1 Unconstrained lands capable of development Class 2 Uniform doleritic clay plains (Land Unit 8d) Class 2 lands considered moderately capable of agricultural development occupy 2% of the study area (1 060 ha). They are restricted to Land Unit 8d, and comprise Flood-free, level to very gently undulating (< 1-2%), colluvial plains (sourced from dolerite) with very deep, moderately-well drained, non-saline, self-mulching brown or grey Vertosols (cracking clays). Constraints to agricultural development are limited to minor gilgai (VI < 0.3 m) and a moderate erosion risk on slopes between 1-2%. Soils within Land Unit 8d are considered physically capable of broadacre agricultural development, but require erosion and sediment control planning and management to ensure long-term sustainability. 8.3.2 Variably constrained lands limited development potential Class 2-4 Spatially variable doleritic pediments/plains (Land Units 7d1, 7d2) Class 3-4 Spatially variable sedimentary pediments/plains (Land Units 8b, 8c) Class 4 Spatially variable clay floodplains (Land Units 9d, 9e1, 9e2) Land units 7d1, 7d2, 8b and 8c encompass significant spatial variability in the severity and distribution of primary constraints, and were assigned multi-class capability ratings on this basis. Land Units 7d1 and 7d2 are constrained by unpredictable slope and surface rock (Class 2-4), while Land Units 8b and 8c are limited by highly variable slope, sodicity, drainage and surface rock (Class 3-4). Similarly, Land Units 9d, 9e1 and 9e2 are constrained by regular flooding (Class 4 at the scale of mapping), but exhibit significant local spatial and temporal
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