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Studies on Soil Spatial Variability and Its Impact on Cane Yield Under Precision Nutrient Management System
1M. Kumar R, 2D. Nadagouda
1. University of Agricultural and Horticultural Sciences, Shiva
2. Scientist Sugarcane Agronomy

In present investigation an attempt was made to quantify the soil variability of 30 grids of 10 m x 10 m dimension at research farm of Nandi Sahakari Sakkare Karkhane (NSSK), Krishna Nagar, District. Bijapur. Each grid (10 m x 10 m) showed variation with available nitrogen as low as 140 kg ha-1 to as high as 245 kg/ha with a range of 105 kg/ha, phosphorus as low as 53 kg P2O5 ha-1 and as high as 89.3 kg P2O5 ha-1 with a range of 36.3 kg P2O5 ha-1, potassium as low as 427 kg K2O ha-1and as high as 698 kg K2O ha-1with a range of 184 kg K2O ha-1, whereas organic carbon was as low as 0.68 per cent to as high as 1.46 per  cent with a range of 0.78 per cent. The deviation that existed among the grids with available nitrogen, phosphorus and potassium was to the tune of 30, 9.5 and 57 kg ha-1, respectively indicating that there existed sufficient soil variability in nutrients status. Concurrently, a common crop of sugarcane was harvested to quantify inherent capacity of soil to produce yield the variation in yielding ability of soil sugarcane harvested from 30 grids (10 m x 10 m) showed wider yield variation (82.7 t ha-1 – 128.2 t ha-1), 45.5 t ha-1 with a standard deviation of (s = 10.48) and the range of nutrients uptake varied from 148.9 – 547.4 kg N ha-1 (398.5), 2.48 –15.61 kg P ha-1 (13.13) and 124.8 – 434.2 kg K ha-1 (309.4).  Indicating that according inherent capacity of the soil nutrients were (NPK) omitted from the experimental unit and it clearly reflects the scope to enhance the yield by adopting site specific nutrient management approach through variable rate approach.   

Keyword: Soil Spacial Variability, Sugarcane, Precision Nutrient Management, Yield