Propriedades químicas do solo e morfologia radicular da soja sob aplicação de diferentes granulometrias de calcário

Abstract

The use of different limestone granulometries and CaCO+MgCO in chemical attributes of dystrophic Red Latosol and their co-relationship with parameters of development of soybean culture are evaluated. Assay was totally randomized, with four replications. Treatments comprised application of CaCO+MgCO, limestone with granulometries between 2.00 and 0.82 mm; 0.30 and 0.20 mm; 0.05 and 0.01 mm; control consisted of soil without limestone. Evaluations were undertaken at 15, 30 and 45 days after application of treatments. Evaluation were undertaken in the laboratory by analyzing chemical attributes such as pH (in H2O), H++Al3+, K+, Ca2+ and Mg2+. Dry matter of the areal and root section, radicular area, radicular diameter, radicular length and root volume were evaluated forty-five days after soybean emergence. After 15 days of reactivity, a greater pH increase was detected when granulometry between 0.30 and 0.20 mm and CaCO+MgCO were employed. However, other treatments were also somewhat efficient in pH increase. Greatest soybean radicular mass was detected when limestone with granulometry larger than 0.82 mm was used. The application of limestone with granulometry between 0.30 and 0.20 mm and CaCO + MgCO triggered a greater mass in soybean aerial section.