Foliar application of aminoacids and nitrogen as topdressing on second corn crop

The objective of this study was to evaluate the foliar application of amino acids associated with the application of nitrogen as topdressing on yield performance and agronomic characteristics of corn, cultivated during the latter season. The experimental design was a randomized block design in a 4 x 4 factorial, with 4 repetitions. Four doses of nitrogen (0, 60, 120 and 180 kg ha(-1)) as urea were used and four doses of amino acids (0, 8, 16, and 24 L ha(-1)) were applied on leaves. The maize cultivar used was Pioneer 305 31H. The variables analysed were: leaf N content, plant height, ear height, stem diameter, ear length, number of kernel rows per ear, number of kernels per row, number of grains per spike, weight of 100 grains and yield. The amino acids did not alter the analysed variables. Nitrogen increased linearly the variables plant height, height of insertion of ear, number of grains per ear and number of kernels per row. The length of spike, thousand grain weight and grain yield response to nitrogen obtained under maximum doses of 135.3, 157 and 149.5 kg ha(-1), respectively.