Soil P range (mg kg -1 ) Cropping System (Olsen-P) Rice-Rice (% fields) Rice-Vegetable (% fields) Vegetable-Vegetable (% fields) <5 9 5 – 10 35 10 – 15 245 15 – 25 2920 25 – 50 33215 50 – 100 1417 100< 2968 Distribution of soil P levels in different cropping systems in Sri Lanka (Wijewardena, 1990) At present rice crops in Sri Lanka do not show P deficiency Sri Lanka does not own high quality P reserves Department of Agriculture has reduced the P application rate to rice recently
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