02179naa a2200373 a 450000100080000000500110000800800410001902400390006010000200009924501090011926000090022852011380023765000250137565000230140065000190142365000200144265000290146265000110149165000180150265000180152065000090153865000160154765000230156365000200158665300090160665300180161565300120163370000180164570000180166370000190168170000190170070000150171977300710173420263722016-03-03       2015    bl uuuu     u00u1 u    #d7 a10.1080/01904167.2015.10170502DOI1 aSOUZA, H. A. de  aAssessment of nutritional status of guava seedlings using preliminary DRIS norms and sufficiency ranges.  c2015  aAbstract: The objective of this work was to propose preliminary Diagnosis and Recommendation Integrated System (DRIS) norms and derive critical levels and nutrient sufficiency ranges in the leaves of guava plants in commercial nursery conditions. Sixty-eight leaf samples were evaluated from fertilization trials with seedlings. In the low-yield subpopulation (84% of the population), the limiting nutrients by deficiency in descending order were nitrogen (N)&gt copper (Cu)&gtphosphorus (P) = potassium (K)&gt manganese (Mn)&gt iron (Fe) = zinc (Zn)&gt sulfur (S)&gt boron (B) = magnesium (Mg)&gt calcium (Ca), and the limiting ones by excess in descending order were B &gt Ca &gt Fe &gt Mn &gt S &gt Mg &gt Cu &gt P &gt Zn &gt N = K. The ranges of the appropriate DRIS indices were 24 to 28, 2.4 to 3.1, 21 to 29, 6 to 8, 1.9 to 2.9 and 1.9 to 2.3 (g kg?1) for the macronutrients N, P, K, Ca, Mg and S, respectively, and 35 to 48, 4 to 15, 68 to 93, 31 to 60 and 180 to 245 (mg kg-1) for the micronutrients B, Cu, Fe, Mn and Zn, respectively. The dry matter production of guava seedlings was associated with the nutritional status.  aNitrogen fertilizers  aNutritional status  aTrace elements  aAnálise Foliar  aFertilizante nitrogenado  aGoiaba  aMacroelemento  aMicroelemento  aMuda  aNitrogênio  aNutrição vegetal  aPsidium Guajava  aDRIS  aLeaf analysis  aNursery1 aROZANE, D. E.1 aAMORIM, D. A.1 aDIAS, M. J. T.1 aMODESTO, V. C.1 aNATALE, W.  tJournal of Plant Nutritiongv. 38, n. 10, p. 1611-1618, Aug. 2015.