The phrase "a combination of soil" is correct and usable in written English.
It can be used when discussing different types of soil mixed together for gardening, agriculture, or scientific purposes.
Example: "For optimal plant growth, it's essential to use a combination of soil that includes organic matter, sand, and clay."
Alternatives: "a mixture of soil" or "a blend of soil".
The causes of the sudden abandonment of many Mayan cities starting about 850 ce are still being debated, but a combination of soil exhaustion, climate change, and armed conflict may have contributed to the cities' decline.
A combination of soil and understorey vegetation attributes entirely separated healthy, declining and poor sites in a canonical analysis.
Adoption of a no-till system with stubble removal will result in reductions in grain yields and a combination of soil degradation and erosion.
A combination of soil amendments (lime and compost) was most effective to improve plant fecundity, and reduce metal uptake by leaves.
A combination of soil characterizations, computations and small-scale experiments were performed in order to better understand the behavior of shallow-buried explosives.
Our study took place in a restored (2008) brackish marsh (Texas, USA) that included mounded formations built from on-site soil, off-site dredge material, or a combination of soil sources.
The CN for a drainage basin is estimated using a combination of land use, soil, and antecedent soil moisture condition (AMC).
To understand this result, detailed analysis of TRFLP peak sharing was conducted, which suggested that the proximate sources of candidate founder endophytic bacteria in wild/pre-domesticated plants (Parviglumis), a traditional landrace (Mixteco) and a modern hybrid (Pioneer 3751) were a combination of passive soil uptake, selective soil uptake and vertical transmission.
From 4 DAS onwards there was a combination of high soil temperature (>38°C), high soil impedance to shoot growth (>1.6 MPa) and low matric potential (<−500 kPa), which is likely to have reduced emergence.
The SWAP zones in MODFLOW are derived from a combination of topology, soil type, land use, water management practices using geographic information systems (GIS).
The basic types are wetter clay soil, drier sandy soil, or loam soil-a combination of the first 2 soils.
