Here are some more natural-sounding ways to say "loamy soil" in Tagalog:
* Lupa na may halo-halong buhangin, putik, at organikong bagay (Soil with a mixture of sand, clay, and organic matter)
* Lupa na may katamtamang pagkakayari (Soil with a moderate texture)
* Lupa na mayaman sa sustansiya (Soil rich in nutrients)
The best way to express "loamy soil" in Tagalog will depend on the context and the specific characteristics of the soil you are describing.