Soil chemical attributes and wheat response to no-till surface liming

After years of no-till (PD), arguments have emerged tha tthe requirement of lime (NC) in this system may be lower than for convention altillage system. However, the low quality on the adoption of the practices required to make PD system to work in the field, as well as the soil attributes stratification in depth in areas of consolidated PD have hindered yield increases and maximized crop shortfall due to draught periods, when liming can mitigate the negative effects of water restriction on nutrition and productivity of crops. The objective of this paper was to evaluate the initial effects of superficial liming in PD on soil chemical attributes, nutrition and yield of wheat, in a long run experiment settled in Guarapuava-PR. Treatments were: without limin gand with liming(rate necessary to reach V= 70% in the 0-20 cm layer). Liming increased soil pHC(a)Cl(2) (5,12 -> 5,70) and the level of calcium (4,90 -> 5,32 cmol(C) dm(-3)) and decreased the already low level of Al3+(0,06 -> 0,00 cmolC dm-3) in the 0-10 cm layer at 150 days after lime application. Using the rate necessary to reach V = 70% in the 0-20 cm layer, liming did not significantly affect nutrition and yield of wheat cultivated just after lime application, in a cropping season with good rainfall distribution, on a soil with low Al3+ level and initial levels of basic cations above the critical levels.