INFLUENCES OF PHOSPHORUS DEFICIENCY ON THE UPTAKE OF NITROGEN, POTASSIUM, CALCIUM, MAGNESIUM, SULFUR, AND ZINC IN LOWLAND RICE VARIETIES

A field experiment was conducted to study the effect of phosphorus (P) deficiency on the mineral nutrition of five modern, high-yielding rice varieties, Purbachi, BR1, BR3, BR14, and BRRIDHAN29. The available P in the soils of different plots of the experimental field varied from 2.8 to 16.4 mg kg−1. Such a wide range of available P in the different plots resulted from differences in the amounts of P (0 to 480 kg ha−1) applied over a period of 8 years during a previous long-term P fertilizer trial in the same field. The relationship among the P, potassium (K), and magnesium (Mg) concentrations in rice straw and grain in a soil P deficiency situation were especially noteworthy. The K concentration in…