Influence of liming and phosphate fertilization on zinc adsorption and zinc uptake by maize
1995
Tagwira, F. | Piha, M. | Mugwira, L.
A series of laboratory, greenhouse and field experiments were carried out to assess the effect of application of different levels of lime and phosphate on soil zinc availability, zinc uptake and the yield of maize using a sandy soil and a sandy clay loam soil. The laboratory incubation studies showed a very significant decrease in zinc availability with lime application. An increase in pH by 1.0 was found to increase zinc sorption by about 125 percent in the sandy soil and by 2900 percent in the sandy clay loam. The study also showed that phosphate applications at the rate of 100 ugP/g soil increased zinc sorption by about 28.8 per cent in sandy soil and 16 per cent in red clay soils. We conclude that application of P affected zinc sorption by an indirect pH effect and a possible CEC effect. Both pH and phosphate application reduced zinc uptake by maize. Increased response to zinc was observed at higher phosphate application rates. Zinc concentration of maize grown on sandy soils was observed to be about 2.3 times higher than that grown on sandy clay soils.
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