Development of soil technology for afforestation of sodic soils in Uttar Pradesh, India.
A field experiment was laid out in sodic (pH 10.3, ESP 70) soil at Kanaksinghpur in Sultanpur district, Uttar Pradesh, with the objective of developing a technology for afforestation of sodic waste land. The experiment consisted of four soil management treatments coupled with two drainage treatments applied to Albizia procera and Eucalyptus tereticornis planted as seedlings in 10×10 m plots in pits of 60×60×60 cm, at 2×2 spacing, in July 1987. The soil management treatments were: M0, pits filled with original soil; M1, pits filled with original soil mixed with 5 g BHC [HCH] and mulched with 1 kg rice husk; M2, original soil mixed with 3 kg gypsum, 20 g urea, 50 g single superphosphate, 25 g muriate of potash, 5 g HCH, 200mg ferrous sulfate, 200 mg zinc sulfate and 2 kg rice husk before planting, in each pit. One kg rice husk was applied as mulch to each plant after planting, and a top dress of 15 g urea to each plant 3 and 5 months after planting; and M3, as M2 but using a top dress of 100 g IFFCO NPK (12:32:16), 5 g HCH and 1kg rice husk 1 yr after planting, and 50 g urea 2 yr after planting. Drainage treatments were: D0, no drainage; and D1, with a drainage channel 1 m deep and 1 m wide running through the plots. Irrigation was done twice a month in the summer and once a month in the winter. Survival and height were recorded 6, 12, 24 and 36 months after planting and collar circumference 24 and 36 months after. The best results were obtained with treatments M2 and M3, with M3 generally superior. The drainage treatment (D1) was only favourable when no or little management treatment was applied (M0 and M1).