The use of water pumped from boreholes or diverted from rivers to assist agriculture. This makes it possible to use otherwise uncultivable land, and to produce larger and more reliable crops on land already in use.

• peril point
• period, accounting
• period of gestation
• period of oscillation
• periphery
• permanent income
• permission, planning
• permit to pollute
• perpetual inventory method
• perpetuity
• perquisites
• personal disposable income
• personal equity plan
• personal income distribution
• Personal Investment Authority
• personal loan
• personal preferences
• personal sector
• PESC
• peso problem
• petro-currency
• petro-dollars
• Phillips curve
• physical capital
• phytosanitary measures