Spatial Variability of Micronutrients and Sulphur Based on Newly Evolved Six Critical Limits in a Canal Command Area
摘要
The current study initiated with 211 geo-referenced soil samples of 0–15 cm depth from command area (545.64 ha) in 2020–22 with the goal of evaluating the spatial variability of micronutrients iron (Fe), zinc (Zn), copper (Cu), manganese (Mn) and sulphur (S) by developing soil fertility maps with GIS using ordinary krigging technique. Standard methods of soil analysis were applied to a geo-referenced set of soil samples obtained from the minor lift canal command area of district Banda (U.P.). Cationic micronutrient availability data has been classified into six critical limit groups. Analyzed soil samples had a mean value of 6.61 ± 1.59. (varied from 1.63 to 9.63) mg kg−1, 5.15 ± 1.82 (varied from 1.96 to 11.43) mg kg−1, 0.77 ± 0.68 (varied from 0.17 to 9.56) mg kg−1, 0.44 ± 0.12 (varied from 0.16 to 0.81) mg kg−1 and 14.80 ± 5.42 (ranged 3.69– 32.67) mg kg−1 for iron, zinc, copper, manganese, and sulphur, respectively. The soil variations in analysed samples in the Kanwara minor lift canal command area advocating the sequence Zn > S > Cu > Mn > Fe with moderate variability, in which Fe being the most variable element with 24.05 percent variability. Based on the newly developed six critical limits, interpolated maps exposed the deficiency (acute deficiency and deficiency) of nutrients in the village, 62.2%, 35.7%, 33.1%, 9.5% and 8.1% for S, Zn, Cu, Fe and Mn, respectively.