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Quantitative assessment of positive impacts of long-term conservation agricultural practices in rainfed Alfisols

Restorative management practices such as minimum tillage, surface residue application and stubble retention may help in providing resilience towards climate change by way of higher moisture retention, reducing soil temperature, influencing soil quality indicators and improving soil quality. An experiment with surface application of 4 levels of sorghum residues @ 0, 2, 4, 6 t ha-1 in combination with N (30 kg N ha-1 for cowpea and 60 kg N ha-1 for sorghum through urea) and uniform dose of 30 kg P2O5 ha-1 (through super phosphate) with minimum tillage, was initiated in 2005. The system adopted for this study was sorghum-cowpea with yearly rotation. During 2015, sorghum was grown as the test crop.


Sorghum grain yield varied from 1140 to 2110 kg ha-1. Significantly higher sorghum yield (2110 kg ha-1) was observed with application of sorghum stover @ 6 t ha-1 followed by @ 4t ha-1 (1912 kg ha-1) and 2 t ha-1 (1273 kg ha-1) compared to control (1140 kg ha-1). The increase in yield due to application of sorghum stover @ 6, 4 and 2 t ha-1 was to the extent of 85%, 67% and 11% respectively over no residue application.

Effect of graded levels of residues on yield of Sorghum under minimum tillage (2015)

   
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