Formas de manganês e ferro em solos de referência de Pernambuco

SUMMARYThe monitoring of heavy metal concentrations in areas under intensive agriculture is essential for the agricultural sustainability and food safety. This paper evaluates the total contents of heavy metals in soils and mango trees in orchards of different ages (6, 7, 8, 9, 10, 11, 14, 16, 17, 19, and 26 years) in Petrolina, Pernambuco, Brazil. Soil samples were taken from the layers 0-20 cm and 20-40 cm, and mango leaves were collected in the growth stage. Areas of native vegetation (Caatinga) adjacent to the cultivated areas were used for comparison. The total concentrations of heavy metals (Cu, Cr, Fe, Zn, Mn, Ni, and Pb) were determined in soils and leaves. In general, mango cultivation led to Cu and Zn accumulation in the soil surface and to a reduction in the contents of Ni, Pb, Mn, and Fe in surface and subsurface. Since contamination by Cu, Zn, and Cr was detected, these areas must be monitored to prevent negative environmental impacts. For instance, the presence of Cr in mango tree leaves indicates the need to investigate the source of the element in these orchards. The management strategies of the different companies led to deficiency or excess of some metals in the evaluated areas. However, the Fe and Mn levels were adequate for the mineral nutrition of mango in all areas.

Section: Resultssupporting

confidence: 53%

Heavy metals in soils and plants in mango orchards in Petrolina, Pernambuco, Brazil

Silva

Nascimento

Biondi

et al. 2012

“…There were significant differences only in the 0-10 and 60-80 cm layers, with the lowest content found in the RDI treatment in the 0-10 cm layer and in the FI treatment in the 60-80 cm layer (Figure 2c Oliveira and Nascimento (2006) observed that organic matter was mainly responsible for the retention and availability of Mn in the soil. Thus, the greater content of soil organic matter (SOM) found in the 0-10 and 10-20 cm layers (Table 1) allowed greater Mn contents (r = 0.8783**, data not shown).…”

Section: Soilmentioning

confidence: 94%

Heavy Metals and Micronutrients in the Soil and Grapevine Under Different Irrigation Strategies

Oliveira

Lima

Salviano

et al. 2015

Soils under natural conditions have heavy metals in variable concentrations and there may be an increase in these elements as a result of the agricultural practices adopted. Transport of heavy metals in soil mainly occurs in forms dissolved in the soil solution or associated with solid particles, water being their main means of transport. In this context, the aim of this study was to evaluate the heavy metal and micronutrient content in the soil and in the grapevine plant and fruit under different irrigation strategies. The experiment was carried out in Petrolina, PE, Brazil. The treatments consisted of three irrigation strategies: full irrigation (FI), regulated deficit irrigation (RDI), and deficit irrigation (DI). During the period of grape maturation, soil samples were collected at the depths of 0-10, 10-20, 20-40, 40-60, and 60-80 cm. In addition, leaves were collected at the time of ripening of the bunches, and berries were collected at harvest. Thus, the heavy metal and micronutrient contents were determined in the soil, leaves, and berries. The heavy metal and micronutrient contents in the soil showed a stochastic pattern in relation to the different irrigation strategies. The different irrigation strategies did not affect the heavy metal and micronutrient contents in the vine leaves, and they were below the contents considered toxic to the plant. In contrast, the greater availability of water in the FI treatment favored a greater Cu content in the grape, which may be a risk to vines, causing instability and turbidity. Thus, adoption of deficit irrigation is recommended so as to avoid compromising the stability of tropical wines of the Brazilian Northeast.

“…The results differ from those in other soils and climatic conditions, as those described by Rodrigues et al (2001) and Bataglia & Raij (1989), indicating DTPA as more suitable for Mn extraction than Mehlich-1. Oliveira & Nascimento (2006) suggested Mehlich-1 and DTPA as the extractants with the best correlations with plantavailable Mn forms in soils of the state of Pernambuco.…”

Section: Mn Content In the Soil And Accumulated In Plantsmentioning

confidence: 98%

Assessment of micronutrient extractants from soils of Paraná, Brazil

Sarto

Steiner

Lana

2011

SUMMARYIn Brazil, plant-available micronutrients in the soil can be determined by several chemical extractants, the most common of which are dilute acid and chelating solutions. The purpose of this study was to assess the extractants 0.1 mol L -1 HCl, Mehlich-1, Mehlich-3 and DTPA for analysis of the micronutrients Cu, Zn, Fe, and Mn in soils from the state of Paraná. In samples from 12 soils (0-20 cm layer), wheat was planted (Triticum aestivum), grown for 42 days after emergence, and then bean (Phaseolus vulgaris) for 38 days. At the end of each planting period, the soil was sampled again. All extractants tested to assess the availability of Cu, Zn, Fe, and Mn correlated with each other. The efficiency of the extractants HCl, Mehlich-3 and DTPA in assessing plant-available Cu was similar, unlike Mehlich-1, which proved less efficient. The extractants HCl, Mehlich-1 and Mehlich-3 were less efficient in estimating plant-available Zn and Fe, and the most indicated extractant is DTPA. The efficiency of the extractants HCl, Mehlich-1, Mehlich-3 and DTPA in assessing plant-available Mn in soils from Paraná was similar.Index terms: soil analysis, correlation, copper, zinc, iron, manganese.