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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, in Januária micro-region, 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 of P – in order 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. The doses of P and the specific masses of the soil constituted the nine treatments carried out in a complete factorial scheme. The cultivation was carried out in PVC pots with dimensions of 19.4 cm in internal diameter and 23.5 cm in height, with a useful volume of 5.912 dm3 of soil. Plant growth was determined by measuring plant height, stem diameter, number of leaves and water consumption throughout the cycle, and dry mass of roots, stem and leaf at the time of collection of the experiment. For statistical analysis of the data, analysis of variance, Tukey average test and regression analysis were performed. In general, the growth characteristics of the plants showed a more pronounced response to phosphate fertilization compared to the physical compression tested. Jatropha roots were unable to penetrate a soil layer with a specific gravity of 1.91 kg dm-3.

Crescimento do pinhão-manso em resposta à adubação fosfatada e à compactação de um Latossolo Vermelho Amarelo sob cultivo em ambiente protegido