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alfalfa
banana
barley
boron
calcium
canola
chloride
citrus
coarse grains
copper
corn
cotton
crop quality
crop rotations
cropping systems
cultural practices
education
environment
extension
fertigation
fertilizer economics
Brazil
BRAZIL-55
Sources and Rates of Phosphorus in a Cultivation System Integrating Crop and Pasture Production in the State of Parana
IPNI
Northern Great Plains
Southeast Asia
Southern India & Sri Lanka
Southern Latin America
fertilizer placement
field variability
