proper Zn recommendations for soil application is needed for Zn deficient soils. The
effectiveness of Zn applications was evaluated in different combinations of rates (2.5, 5.0,
7.5, and 10.0 kg ha− 1 per year) and frequencies (initial, alternate, and every year) in rice
(Oriza sativa L.)–wheat (Triticum aestivum L.) cropping system in a Zn-deficient upland
calcareous soil in the fourth year. Zn applications to rice at 7.5 and 10 kg ha− 1 of alternate …