Nitrogen dynamic beneath five tree species in irrigated plantations in Pakistan
Nitrogen dynamic beneath five tree species in irrigated plantations in Pakistan
Zahid Javid and R. F. Fisher
ABSTRACT
In irrigated plantations of Punjab extensive management
results in nutrient deficiency and tree growth becomes N
limited on sites where non dinitrogen - fixing species
are raised. The fast growing hybrid poplar and mulberry
deplete the soil of its essential nutrients. The soils
under Pinus roxburghii Sarg., Leucaena and Eucalyptus
camaldulensis Dehn. Show increased net nitrogen
mineralization rates, whereas continuously grazed and
leaf-litter harvested sites of mulberry and hybrid
poplar (1-214) have comparatively low total soil
nitrogen, net nitrogen mineralization rates and,
consequently, low N assimilation.
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September 1991
Vol. 41, Iss. 3
