A ready-reckoner to help pigeonpea researchers determine plant populationY SChauhanauthorA ready-reckoner to calculate plant population/ha using a range of row-to-row and plant-to-plant spacings is presented. A formula for determining plant population for a combination of row and plant spacings not given in the table is also presented.Pigeonpea1990International Crops Research Institute for the Semi-Arid Tropics Article