The present work aimed to quantify the growth of young physic nut plants submitted to variations in phosphorus (P) and specific masses of a Red Yellow Latosol soil. Previously, a soil sample was collected in the 20 to 40 cm layer, making sure in the laboratory the low availability of P - 1.4 mg dm-3 - to apply the treatments of interest. Doses of 0, 106 and 318 mg dm-3 of P were applied, using the simple superphosphate source; and the soils were compacted until reaching specific soil masses equal to 1.53; 1.72 and 1.91 kg dm-3, in a complete factorial scheme, totaling nine treatments. The cultivation was carried out in pots and the dry biomass of the aerial part of the physic nut and its parts fractionated in the stem, leaves adhered to the stem and senescent leaves were determined. The contents of P, K, Ca, Mg, Cu, Fe, Mn and Zn were determined, and from the dry mass accumulation data, the contents of these minerals in the plants were quantified. The statistical analysis of the data consisted of analysis of variance, Tukey average test and regression analysis. In general, the mineral composition characteristics of the plants showed a more pronounced response to phosphate fertilization compared to the tested physical compression. The maximum estimated mineral content in physic nut plants was 51.78 mg of P; 463.37 mg of K; 201.84 mg of Ca; 124.18 mg of Mg; 76.17 µg of Cu; 4,254.07 µg of Fe; 18,787.15 µg of Mn and 769,97 µg of Zn.
O presente trabalho objetivou quantificar o crescimento de plantas jovens de pinhão-manso submetidas a variações de doses de fósforo (P) e de massas específicas de um solo Latossolo Vermelho Amarelo. Previamente, na micro-região de Januária, foi coletada uma amostra de solo na camada de 20 a40 cm, certificando-se, em laboratório, da baixa disponibilidade de P – 1,4 mg dm-3 de P – a fim de se aplicar os tratamentos de interesse. Foram aplicadas doses de 0, 106 e 318 mg dm-3 de P, utilizando a fonte superfosfato simples; e os solos foram compactados até atingirem massas específicas de solo iguais a 1,53; 1,72 e 1,91 kg dm-3, em esquema fatorial completo, totalizando nove tratamentos. O cultivo foi em vasos de PVC com dimensões de 19,4 cm de diâmetro interno e 23,5 cm de altura, com volume útil de 5,912 dm3 de solo. O crescimento das plantas foi determinado por meio de mensurações de altura de planta, diâmetro de colo, número de folhas e consumo hídrico ao longo do ciclo; e de massa seca de raízes, caule e folha a época da coleta do experimento. Para análise estatística dos dados fez-se análise de variância, teste de média Tukey e análise de regressão. De modo geral, as características de crescimento das plantas apresentaram resposta mais pronunciada à adubação fosfatada comparada à compressão física testada. As raízes de pinhão-manso foram incapazes de penetrar camada de solo com massa específica de solo igual a 1,91 kg dm-3.
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