Abstract
Zinc (Zn) deficiency is a fairly wide spread agronomic constraint in many of the world rice production regions. Information on soil Zn distribution is essential for understanding its chemical reactions and bioavailability. In this backdrop, we tried to find out the relationship between physic-chemical properties and DTPA-extractable Zn (available Zn) content of rice soils. For this eighty four (84) surface soil samples (0-20cm) were collected from three villages (viz. Saharapali, Nuagarh and Adgaon) of Bargarh district under the Hirakud Command Area of Odisha. Analytical observations revealed that the soils were slightly acidic in reaction with moderately high content of soil organic carbon. Considering the critical limit of available Zn in soils to be 0.6 mg kg-1, all soils of the study area were found to be well supplied with DTPA-extractable Zn. Soil organic carbon (SOC) content maintained positive and significant correlation with available zinc content in soils. However, soil pH showed significant but negative correlation with available zinc content of soils.
Highlights
Zinc is an important trace element which is essential for the healthy crop growth and metabolism[1]
Zinc is vital for terrestrial life since it is required either as a structural component or reaction site in numerous proteins. It is required by rice in small quantity, but its deficiency has an adverse effect on healthy crop growth and yield may reduce up to 30 percent[2]
Knowledge on distribution of available zinc content in wetland rice soils and various soil properties influencing its availability might prove to be the best approach for obtaining reliable information about the status of zinc.we took an attempt to study the DTPA- extractable Zn content and its relationship with physic-chemical properties of soils in some villages of Bargarh Block under the Hirakud command area
Summary
Zinc is an important trace element which is essential for the healthy crop growth and metabolism[1]. Zinc deficiency is one of the most widespread nutrient disorders in lowland rice after nitrogen and phosphorus Such deficiency arises from adoption of modern technology with intensive cultivation and growing of high yielding varieties and shifting towards the use of high analysis NPK fertilizers with inadequate use of organics or no application of Zn fertilizers.Though it is required by plants in very trace amounts, its availability in soils for plants is a complex mechanism. Hirakud command area under the central western table land agro-climatic zones is the major paddy growing region of Odisha, popularly known as rice bowl of Odisha. The soils of this area are continuously under submerged condition which enables rice plants to absorb Zn mostly from solubilisation of bound Zn in the rhizosphere because the availability in the soils is very limited due to flooded condition[13]. Knowledge on distribution of available zinc content in wetland rice soils and various soil properties influencing its availability might prove to be the best approach for obtaining reliable information about the status of zinc.we took an attempt to study the DTPA- extractable Zn (available Zn) content and its relationship with physic-chemical properties of soils in some villages of Bargarh Block under the Hirakud command area
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