02119naa a2200217 a 450000100080000000500110000800800410001902400380006010000190009824501120011726000090022952015230023865000100176165000090177165000100178065000100179065000170180065000090181765000100182677300650183620791002017-11-07       2015    bl uuuu     u00u1 u    #d7 a10.1080/01904167.2014.9831222DOI1 aFAGERIA, N. K.  aZinc, copper, boron and iron requirement of upland rice grown on a brazilian oxisol.h[electronic resource]  c2015  aDeficiency of micronutrients increasing in field crops, including upland rice in recent years. The objective of this study was to determine requirement of zinc (Zn), copper (Cu) boron (B) and iron (Fe) for upland rice grown on a Brazilian Oxisol. The levels used were: Zn (0, 10, 20, 40, and 80 mg kg−1), Cu (0, 5, 10, 20 and 40 mg kg−1), B (0, 5, 10, 20 and 40 mg kg−1) and Fe (0, 250, 500, 1000, and 2000 mg kg−1). Plant height, straw yield, grain yield, panicle number and grain harvest index (GHI) were significantly improved with the addition of these micronutrients. Root growth was also improved with the application of micronutrients, except with the addition of B. Maximum grain yield was obtained with the addition of 51 mg Zn, 24 mg Cu, 5 mg B kg−1, and 283 mg Fe kg−1 soil. Similarly, maximum straw yield was obtained with the addition of 38 mg Zn, 17 mg Cu, 6 mg B kg−1, and 1500 mg Fe kg−1 soil. Maximum plant height was obtained with the addition of 54 mg Zn, 10 mg B kg−1, and 1197 mg Fe kg−1 soil. Copper did not affect plant height significantly. Maximum panicle number was obtained with the addition of 22 mg Cu kg−1, 3 mg B kg−1, and 1100 mg Fe kg−1 soil. Zinc did not affect panicle number significantly. Maximum GHI was obtained with the addition of 61 mg Zn kg−1, and 8 mg B kg−1. Zinc was had a linear increase in GHI in the range of 0 to 80 mg kg−1, and Fe showed a negative relationship with GHI.  aArroz  aBoro  aCobre  aFerro  aOryza sativa  aSolo  aZinco  tJournal of Plant Nutritiongv. 38, n. 9, p. 1346-1358, 2015.