Okay, the user wants me to translate "enrich soil" into Thai. Let me check the rules again. The first rule says to translate all content into Thai. The second rule says if it's already in Thai, leave it as is. The third rule is to provide only the translation without explanations.
So, "enrich soil" is in English. I need to translate it. The direct translation would be "ปรับปรุงดิน" which means "improve soil" or "enrich soil." I should make sure there's no existing Thai text here. Since the input is in English, I proceed with the translation. No need for explanations, just the Thai result. Let me confirm the translation again to be accurate. Yes, "ปรับปรุงดิน" is correct.