Changing dynamics of micronutrients in piedmont soil of Bangladesh

Abstract

A study was aimed to delineate the micronutrient status, their change directive with time and relationship with other soil variables in piedmont soils of Bangladesh. Northern and Eastern Piedmont Plains (AEZ 22) is one of the 30 agro-ecological zones (AEZs) of the country whose bench mark status of soil micronutrient has been used for comparing with the present status. There is an indication of zinc (Zn) and boron (B) depletion to some extent after a decade of time whereas the very high fertility status of copper (Cu), manganese (Mn) and iron (Fe) prevails as it was in the previous status. In general view, the micronutrient content of surface soil (0-15 cm) was higher than those of sub-surface soils (15-30 cm). In surface soil clay content showed significant correlation with soil Zn (r=0.403**), Cu (r=0.752**), Fe (r=0.501**) and Mn (r=0.340**). Cu content of soil exhibited positive relationship with all the soil parameters except soil pH and P content; there existed highly significant negative correlation of Cu with soil pH (r=-0.578**) and P (r=-0.420**). The availability of Fe in soil was strongly related with soil clay content (r=0.501**), soil pH (r=-0.686**) and organic matter content (r=0.527**). In surface soil, Fe content influenced significantly with the content of Zn, Cu and Mn. Accordingly in sub-surface soil, positive significant interaction of Zn-Fe, Cu-Fe, Cu-Mn and Fe-Mn was observed. The message revealed from this study concerning nutrient depletion, and interactions among different soil parameters and nutrient elements will pave the way for efficient use of soil resources in a sustainable way.

Manganese as a Micronutrient in Agriculture: Crop Requirement and Management

“…A different scenario was observed for piedmont soils of Bangladesh. Recently, Sarker et al (2020) reported that the available Mn status of soils in AEZ 22 (Northern and Eastern Piedmont plain) was categorized as very high in both previous (1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003) and present status (2011-2012) ranging from 4.0 to 171 (average 44.6 μg g -1 ) and 17 to 91 μg g -1 (average 45.1 μg g -1 ), respectively. Again, the Mn content ranged from 9.6 to 67.4 μg g -1 (average 28.8 μg g -1 ) in the sub-surface soil which was comparatively lower than surface soil.…”

Effect of different doses of NPK fertilizer on the abundance of termite (Glyptotermes dilatatus) in tea garden of the north-eastern part of Bangladesh

“…p<0.05 was considered as statistically significant. The nutrients such as nitrogen (N), phosphorus (P), sulphur (S), boron (B), iron (Fe), potassium (K), calcium (Ca) and magnesium (Mg) availability of termite mound and stem soils were analysed in the Soil Research Development Institute (SRDI) of Sylhet, Bangladesh by following the protocol of Sarker et al, 2020 [30] .…”

Influence of land type and cropping on the distribution of micronutrients in Ganges river floodplain soils of Bangladesh

“…In addition to the well-identified deficiencies of the major nutrients, deficiencies of micronutrients have emerged considerably in large areas of the country (1) . Recent studies revealed that the status of Zn and B decreased substantially in many soils of Bangladesh during the last decade (2) . The soils of Ganges River Floodplain, the largest physiographic unit of Bangladesh comprising two important agro-ecological zones (AEZ), are most deficient in micronutrients among the intensively cropped AEZs of the country (3) .…”