You are here

TOWARD A BETTER P NUTRITION PACKAGE: IMPLICATIONS OF CROP DEMAND PATTERN AND ZONE OF ROOT ACTIVITY ON DIAGNOSTIC SOIL P TESTING

Plain text source: 
Without P fertiliser addition, continuous cropping caused a decline of 55%, 35% and 10% in total P from the 0-10, 10-30 and 30-60 cm layers respectively, compared to an uncropped reference soil... Previous work has shown that an index calculated as (Colwell-P/PBI) is highly correlated with immediately available P across a wide range of Queensland soils... The results suggest that Colwell-P is probably a good indicator of P availability in the surface soil during crop establishment (and useful to diagnose the need for starter P) whereas BSES-P is probably a better indicator of subsoil P reserves that are accessed by the crop later in the growing season...
GRDC Taxonomy: