Macro and micronutrients variation in function of NPKMg levels in plant rubber in the nursery

Abstract

The assays were carried out in the Experimental Field of UEPAE -Macapá/Embrapa in Mazagão, AP, Brazil, in a Yellow Latossol, clay texture, with the objective of defining N, P, K and Mg levels for nursery plant rubber (Hevea spp.). The experimental design was "FAO type" with 16 treatments and 6 replicates, in randomized blocks with each experiment repeated anually from 1983 to 1985. The data evaluated were leaf levels of N, P, K, Mg, Ca, Cu, Fe, Mn and Zn. The levels of P increased the leaf concentration of P and Mg and decreased the leaf concentration of K and Zn. The levels of K in the soil increased the leaf concentration of K and decreased the leaf levels of Mg. The absorption order of nutrients was N>Ca>K>Mg>P>Mn>Fe>Zn>Cu.