Yield index of crops grown under no-tillage after superficial application of micronized liming materials (MLM) on the soil

The development of strategies for the control of soil acidity in production systems using micronized liming material (MLM) could be a strategy in areas under no-till (NT) to produce high crops yield. The micronized liming material (MLM) have faster reaction on the soil surface even without incorporation to the soil. The experimental design used was completely randomized blocks in split-plot with four replications in a Typic Distrudept under NT treated with MLM. In the main plots the dolomitic limestone (DL) and MLM (granulated micronized calcite (GMC); granulated micronized dolomite (GMD) and carbonated suspension (CS) were studied. In the subplots, four doses of liming materials aiming were assigned to increase soil base saturation (BS) to 50, 70 and 90 %, besides of control treatment. We measured the relative yield (RY), relative yield change (RYC) and production efficiency (PE) of wheat, soybean, black oat and maize during four consecutive years (2012 to 2016). The MLM presented major RY and PE along experimental period than DL. Besides, the major RYC of MLM refers to lower responsiveness, major residual effect as well as major or maintenance crops yield. Better results were found in the BS dose aiming to 61 % for all the liming materials studied for PE, showing that it is the adequate BS for control of acidity in Typic Distrudept.