Dry-zone red latosol (Alfisol) soil crusting: managing surface runoff with bund silt traps?

Red-Yellow Latosols (Rhodustalfs) in the southern and northwestern dry zones are rich in iron and kaolinitic clays but suffer from structural breakdown when exposed to heavy raindrop impact. Fine silt and clay particles disperse and seal surface pores, baking into an impermeable hardpan crust under midday sun. This crust stops rainwater infiltration, causing severe sheet erosion and preventing seedling emergence. Farmers manage this by establishing deep contour swales planted with vetiver grass, ripping soil with subsoil tines, and incorporating biochar with cattle manure to stabilize soil aggregates.