Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 9 · Vastu, Griha Pravesha
वास्तु गृहप्रवेशश्च
क्षेत्रमादौ परीक्षेत गंधवर्णरसांशकैः ।मधुपुष्पाम्लपिशितगंधं विप्रानुपूर्वकम् ॥ ५४० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 540.
First test the plot by its smell, colour, taste and parts. The smells are of honey, flowers, sour things and meat. They go with the four classes, starting with the Brahmin.
Simple meaning: Test a plot first by the smell, colour and taste of its soil.
सितं रक्तं च हरितं कृष्णवर्णं यथाक्रमम् ।
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.