EVALUATION OF COMPACTED UREA FERTILIZERS PREPARED WITH ACID AND NONACID PRODUCING CHEMICAL ADDITIVES IN 3 SOILS VARYING IN PH AND CATION-EXCHANGE CAPACITY-II - YIELD AND N USE EFFICIENCY BY RICE
Tj. Purakayastha et Jc. Katyal, EVALUATION OF COMPACTED UREA FERTILIZERS PREPARED WITH ACID AND NONACID PRODUCING CHEMICAL ADDITIVES IN 3 SOILS VARYING IN PH AND CATION-EXCHANGE CAPACITY-II - YIELD AND N USE EFFICIENCY BY RICE, Nutrient cycling in agroecosystems, 51(2), 1998, pp. 117-121
With a view to evaluate the effect of different chemical additives on
the efficacy of urea, a green house study was conducted with wet seaso
n rice (Oryza sativa L.) as test crop. The results showed that compact
ion of phosphogypsum (PG), diammonium phosphate (DAP), ZnSO4, NH4Cl or
KCI with urea increased the rice yield and N use efficiency as compar
ed to that obtained with straight urea. A significant positive correla
tion between potential N loss (measured by soluble N in floodwater) an
d NH3 volatilization (measured by forced air draft system) was observe
d. The results clearly indicate that N use efficiency can be increased
through suitable modification of urea by compacting it with acid and
non-acid producing fertilizers such as NH4Cl, KCI, ZnSO4 and DAP or in
dustrial byproduct like phosphogypsum.