Micronutrients use efficiency in tropical cover crops as influenced by phosphorus fertilization
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Data
2015-03
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Resumo
Deficiency of micronutrients is increasing in the recent years in cropping systems in many parts
of the world and cover crops are important components of cropping systems. A greenhouse experiment was
conducted to evaluate copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) use efficiency in 14 tropical leg-
ume cover crops grown on an Oxisol. The P levels used were low (0 mg kg -1 ), medium (100 mg kg -1 ) and high
(200 mg kg -1 ). The P X cover crops interactions were significant for Cu, Fe, Mn, and Zn use efficiency (tops
dry weight/unit nutrient uptake). Hence, cover crop species varied in nutrient use efficiency with change in P
levels. The micronutrient use efficiency was in the order of Cu > Zn > Mn > Fe. Higher Cu use efficiency was
associated with lower uptake of this element, in the cover crop tops compared to other micronutrients. Similar-
ly, lower efficiency of Fe and Mn was associated with their higher uptake in the tops of cover crops. Overall,
Cu and Mn use efficiency was decreased when P level was raised from low to medium level and then it was
constant. Iron use efficiency was increased with increasing P level but Zn use efficiency was constant with the
addition of P fertilizer.
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Green manure, Crotalaria, Mucuna, Cajanus, Adubo verde, Crotalária, Mucuna, Guandú
Citação
FAGERIA, Nand Kumar; FERREIRA, Enderson Petrônio De Brito; KNUPP, Adriano Moreira. Micronutrients use efficiency in tropical cover crops as influenced by phosphorus fertilization. Revista Caatinga, Mossoró, v. 28, n. 1, p. 130-137, Jan./Mar. 2015.