Calcium deficiency and aluminum toxicity are considered to be the most important acidity factors limiting root growth. A field experiment was carried out on a dystrophic Red Latosol (Haplortox) in Ponta Grossa, Paraná, Brazil, to study the effects of surface application of lime and gypsum on root growth and nutrient uptake by soybean, cv. EMBRAPA 58, under no-tillage system. A randomized complete block design was used, with three replications, in a split-plot experiment. Dolomitic limestone was applied at rates of […]

Soybean response to potassium fertilization was evaluated over a twelve-year period in a field experiment on a Haplohumox soil, in Campos Novos, State of Santa Catarina, Brazil. Treatments consisted of a combination of four levels of K2O applied in the first year (0, 80, 160 and 320 kg ha1), and three levels of K2O (0, 40 and 80 kg ha-1) applied annually from the fifth year. The critical level of K in the soil and in the leaves was determined […]

Supplying capacity, response to fertilization and residual effect of K fertilization were evaluated in a twelve-year soybean field experiment on a Haplohumox soil, in Campos Novos, State of Santa Catarina, Brazil. Treatments consisted of: four levels of K2O (0, 80, 160 and 320 kg ha-1), applied only in the first cropping, on the whole plots; three levels of K2O (0, 40 and 80 kg ha-1), applied annually in the sub-plots from the fifth year; one treatment with application of 40 […]