Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
सितं रक्तं च हरितं कृष्णवर्णं यथाक्रमम् ।मधुरं कटुकं तिक्तं कषायकरसं क्रमात् ॥ ५४१ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 541.
The colours in order are white, red, green and black. The tastes in order are sweet, pungent, bitter and astringent.
Simple meaning: The soil colours are white, red, green and black. The tastes are sweet, pungent, bitter and astringent.
अत्यंतवृद्धिदं नॄणामीशानप्रागुदग्प्लवम् ।
A plot sloping north-east, east or north brings growth. Other slopes can bring loss.
समगर्तारत्निमात्रं खनित्वा तत्र पूरयेत् ।
Dig a small pit and refill it. Extra earth means growth, less earth means loss.
तथा निशादौ तत्कृत्वा पानीयेन प्रपूरयेत् ।
Fill the pit with water at night. Water in the morning means growth. No water means loss.