Produtividade de soja e milho sob calagem após quatro anos de aplicação em SPD na Borda Sul da Amazônia

Abstract

With the expansion of the world population, it is necessary to increase food production in already producing areas. From this, one of the most important managements for such an occurrence to happen is soil management, and more precisely, its correction, the need for liming is estimated by several methods, but in Cerrado soils, the saturation method is mainly used. by base, which raises values of base saturation (V%) of CTC at pH 7.0, to desired values according to your culture. Thus, the present study aimed to evaluate the effects of surface application of limestone after 4 years of application in an area located on the southern edge of the Amazon, verifying the production components of soybean and corn crops and observing the liming recommendations by the method of elevation of base saturation using different doses and types of limestone. The treatments were arranged in a 2x4 factorial, with 2 types of limestone (calcitic and dolomitic) and 4 doses (0.0; 1.7; 3.4 and 5.1 t. ha-1) a randomized block design was adopted. , being arranged in a factorial scheme, 2 X 3 + 1, with doses applied aiming to reach the V% of 47, 60 and 72%, plus a control treatment, without application of limestone, with V% natural of the soil (35%). In the first three years, there was an effect of the corrective both on the soil and on the plants. In the fourth year, morphological characteristics and productivity of soybean and corn were evaluated. It is concluded that in the fourth year after liming there was no more effect for any of the variables analyzed.