Critical Soil Zinc Deficiency Concentration and Tissue Iron: Zinc Ratio as a Diagnostic Tool for Prediction of Zinc Deficiency in Corn

Influence of zinc deficiency on the mineral composition of maize plants in contrasting soils

“…Our results confirm an earlier observation that Zn promotes plant growth by enhancing hormonal and protein syntheses since it is required to form tryptophan amino acid that is a precursor of indole acetic acid (BROADLEY et al, 2012). Positive responses to Zn application have been obtained in several studies, which report superiority in the production of dry matter in maize (KANAI et al, 2009;ZARE et al, 2009) and wheat (ALAM; SHEREEN, 2002;ZHAO et al, 2011).…”

“…Thus, considering the effects of Zn on the accumulation of Fe and other metals (NAMBIAR and MOTIRAMANI, 1981;CHILIAN et al, 2015), it is possible that: the darkness of the stalk nodes in Zn deficiency is related to the accumulation of Fe and other metals; the amount of Fe in the soil can be decisive for results. However, even with 12 different soils, the relationship between the plant growth and Zn concentrations or Fe/Zn ratio is not clear (ZARE et al, 2009). Even Nambiar and Motiramani (1981) observed relationship between production and the Fe/Zn ratio only within each soil studied individually.…”

“…To improve the results of leaf analysis the nutritional status has considered the Zn balance with other nutrients. The Zn versus Fe balance has been studied as the foliar Fe/Zn ratio and showed to be more efficient than the absolute value of the Zn concentration (ZARE et al, 2009). However, lack of Zn expressed a higher number of genes than Fe, Mn and Cu and involved the higher number of proteins related to the absorption and efflux of Cu, Fe, Mn and Ni (WHITE, 2012).…”

Development of Critical Limits for Different Crops Grown in Different Soils and Its use in Optimizing Fertilizer Rates

“…Using the Cate-Nelson graphical method, by Zare et al, (2009) the critical level of the extracted Zn by DTPA and EDTA for corn in non-saline soils in central Iran, were 1.5 and 1.17 mg kg -1 , respectively and the highest yields were produced with the soils in which DTPA extractable Zn was between 1.2 and 1.8 mg kg -1 . In earlier studies critical level of 0.6, was reported for corn (Pal et al, 1989).…”

Maize Yield Response to Zinc Sources and Effectiveness of Diagnostic Indicators

“…The Zn tissue sufficiency concentration for the whole plant at the early growth stage ranges from 20 to 70 mg/kg (Camberato and Maloney 2012). Critical soil levels of 1.5 have been observed for the diethylene triamine pentaacetic acid (DTPA) extraction method, between 0.8 and 1.17 mg/kg for ethylenediaminetetraacetic acid (EDTA)-extracted soil Zn, and 1 mg/kg for 0.1 N hydrogen chloride (HCl), respectively (Zare et al 2009;Alley et al 1972). …”