Evaluation of Spatial variation in available phosphorus content of soils of Haryana

Spatial dependence of available phosphorus (P) content of Haryana soils was measured using geostatistical technique. Four hundred and seventy soil samples at a node of 10 km x 10 km were cellected all over the state. The coefficient of variation was 39.49 per cent. Available P was correlated over space for a separating distance of 61.5 km between two observations. The values between the grid points were interpolated by kriging (point and block) and compared with observed values. The means of observed and kriged values were at par, though the estimation variance calculated by block kriging was 6.51 and 11.09 times less than point kriging and classical techniques, respectively. The sample size was also very less in block kriging as compared to these two techniques.