One-Time Transition Operation
Jantar (Sesbania) Cover Cropping
The living, closed-loop fertility step, grown once during establishment, that replaces every bag of imported fertilizer.
Why It Exists
A newly corrected field has broken physical structure but not yet living biology. Hardpan and soil chemistry can be corrected mechanically, but fertility and soil life have to be built, not imported.
The PQNK Technique
Once permanent beds are formed, PQNK farms sow Jantar (Sesbania aculeata or S. bispinosa) at high density before planting the cash crop, and let it grow for 60–90 days.
Jantar's powerful taproots continue the work the subsoiler started, biologically fracturing the subsoil, pulling up leached minerals from deep layers, and creating vertical channels that the next crop's roots will follow.
This is a closed-loop fertility-building step: no external manure or fertilizer is brought onto the field. Once Jantar reaches maturity, it is terminated at ground level, its roots left to decompose and feed soil microbes, its above-ground biomass chopped and laid as mulch on the very same bed.
One-Time or Permanent?
Jantar is grown once, during the establishment of a new field, ahead of the first cash crop. It is not regrown between every subsequent crop cycle — from there, the permanent mulch-and-no-till loop takes over.
Universal Principle
The universal requirement is permanent biological cover, biodiversity and root activity building the soil from within — not any one specific plant. Jantar is the cover crop PQNK has documented and established for this transition step in the growing environments where it has been used.
Local Implementation
In ecological regions where Jantar itself is not suitable, a locally appropriate deep-rooting, biomass-producing cover species fulfilling the same biological function would take its place. This project's material does not document specific alternative species for other climates, so none are proposed here without that evidence.