O
OA Osmotic adjustment
OCLC On-line Computer Library Center
od Orange discoloration
ODA Overseas Development Administration (UK)
ODAI Operation de Developpement Agricole Integre (Operation for Integrated Agricultural Development)
ODASE Operation de Developpement de Agricole du Sud-Est (Project for the Agricultural Development of the Southeast Region)
ODC Overseas Development Council (USA)
ODEMO Operation de Developpement du Moyen-Ouest (Project for the Development of the Middle-West)
ODEPA Oficina de Planificacion Agricola (Chile)
ODI Overseas Development Institute (UK)
ODM Overseas Development Ministry (formerly Department of Technical Cooperation, UK)
ODNRI Overseas Development of Natural Resources Institute (UK)
ODR Operation de Developpement Rizicole (Project for Rice Development)
OEEC Organization for Economic Cooperation and Development (formerly OECD, France)
OEDF Overseas Economic Development Fund (Japan)
OFCF Overseas Farmers' Cooperative Federation
OM Organic matter
OMS Organic matter solubles
ON Observational nursery
ONADER Operation Nationale pour le Developpement de la Riziculture (Guinea)
ONB Office National des Barrages et de l'Irrigation (Burkina Faso)
OPAC On-line public access catalog
ORP Operational Research Project (India)
ORSTOM Institut Francais de Recherche Sceintifique pour le Developpement en Cooperation (French Institute of Scientific Research for Development)
OS 1) Operating systems
2) Out of stock
OSU 1) Ohio State University (USA)
2) Oklahoma State University (USA)
3) Oregon State University (USA)
OUAT Orissa University of Agriculture and Technology (India)
OVB Outer vascular bundle
OYT Observational yield trial/test
OYWR Outstanding Young Women in Rice Science
P
P Primary tillers
P+H Plow and harrow
PA Prune agar
PAB Photosynthetically active radiation
PAGASA Philippine Atmospheric, Geophysical, and Astronomical Services Administration
PAGE Polyacrylamide gel electrophoresis
PAPR Partially acidulated phosphate rock
PAR Photosynthetic aquatic biomass
PARC Pakistan Agricultural Research Council
PAU Punjab Agricultural University (India)
PB Primary branch
PBH Plowing, broadcasting, harrowing
PCARRD Philippine Council for Agriculture, Forestry, and Natural Resources Research and Development (Philippines)
PCR Polymerase chain reaction
Pd Domestic price
PDA Potato dextrose agar
PDSS Phosphorus decision support system
PEEM Panel of Experts on Environmental Management for Vector Control
PEG Polyethylene glycol
PEM Programme Engrais Malagasy (Malagasy Fertilizer Program)
PES Provincial Extension Service (Papua New Guinea)
PEt Potential evapotranspiration
PF Partially fertile
PFGE Pulse field gel electrophoresis
PFP partial factor productivity
Pg' Gross photosynthesis
PGM Phosphoglucomutase
PGMS Photo-sensitive genic male sterile/sterility
PGR Plant growth regulator
PHILARM Philippine Association of Research Managers
PhilRice Philippine Rice Research Institute
PhilVolcs Philippine Institute of Volcanology and Seismology
PHT Postharvest technology
PHTRC Postharvest Horticulture Training and Research Center (Philippines)
pI Isoelectric point
PI Panicle initiation
PIDE Pakistan Institute of Development Economics
PMIS Projects Monitoring Information System (UNESCO)
PMVR Predicted value of MV adoption ratio
PN Pedigree nursery
PNF Philippine News and Features
PNUE Photosynthetic N use efficiency
PPD Plant population density
PPP Purchasing power parity
PR 1) Partial resistance
2) Phosphate rock
PRA Participatory rural appraisal
PRF Pulse repetition frequency
PRIFAS Programme de Recherches Interdisciplinaires Francais sur les Acridiens du Sahel
PROC People's Republic of China
PS 1) Partially sterile
2) Potential sink
3) Pedigree selection
PSAE Philippine Society of Agricultural Engineers
PSP Photoperiod sensitive
PSS Preliminary screening set
PT Power tiller
PT3 6-8 hp power tiller with steering clutches
PT5 5 hp power tiller
PT6 3 to 8 hp power tiller
PTO Power take off
PTR Prosperity through rice
PTR2 Prosperity through rice phase 2
PTCRD Philippine Training Center for Rural Development
PU 1) Axial flow pump
2) Prilled urea
PU4 6" diam. axial flow pump
PU5 10" diam. axial flow pump
PUDOC Centre for Agricultural Publishing and Documentation (The Netherlands)
PVC Polyvinyl chloride
Pw World price
PWD Ponding water depth
PYT Preliminary yield trial
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