Residual Effect of Nutrients Content in Rice as Influenced by Zinc Fertilization

A field experiment was conducted to evaluate the different brands of zinc fertilizer produced and marketed in different areas of Bangladesh and their effect on nutrients content in rice (BRRI dhan 32). Among the nutrients; the content of N, S and Ca in grains and straw did not vary significantly, but the contents of P, K, Na, Mg, Zn, Cu, Fe and Mn in grain and straw varied significantly due to the application of different brands of zinc fertilizer. The nutrient content in grain was the highest N, P, K, Na, Ca, Mg, S are 1.279, 0.0415, 0.2017, 0.0785, 0.1607, 0.3187, 0.187% and Zn, Cu, Fe, Mn are 10.77, 8.963, 185.30, 61.33 ppm, respectively. On the other hand, the highest content of N, K, Na, Ca, S are 0.709, 5.040, 0.0760, 0.3739, 0.208 % was found in straw,respectively and Zn, Cu, Fe, Mn are 56.65, 55.79, 263.7, 548.8 ppm, respectively. It is apparent that Zn-2 induced highest accumulation of P, Zn, Cu and Mn in rice grain, whereas in straw this brand induced the highest concentration of N, Fe and Mn. The concentration of Zn in both rice grain and straw appeared less in amount in most of the treatments as compared to control except that grain due to Zn-2.