Roots are usually the first plant organs where boron deficiency symptoms appear. The experimental evaluation of the effects of mineral deficiencies on the root system of trees is rather difficult. This experiment aimed to evaluate the effect of boron deficiency on the formation of roots with different diameters and on nutrient accumulation and to characterize visual symptoms of B deficiency in roots of green dwarf coconut trees. The following treatments were applied: complete nutrient solution (+B) and nutrient solution without […]

The objective of this study was to evaluate the effects of P rates and placement on P uptake, leaf P use efficiency (PUE), and grain yield of corn (Zea mays) grown in a Yellow Argissol soil, typical of the coastal tablelands.Rates of 0, 45, 90, 135 and 180kgha-1 of P2O5 were applied in either the rows or broadcast.The study was carried out during the rainy season, from June to September of 1998, at Umbaúba Experimental Station, at Umbaúba (SE), Brazil.Broadcast […]