LAUSR

ABSTRACT Micronutrient and amino acid (AA) foliar fertilization has generally been sprayed onto plants to increase the crop yield. The experiment had the aim of evaluating the foliar boron (B) and AA application on grain yield (GY), physiological characteristics, nutritional status, and yield components in wheat (Triticum aestivum L.) and soybean [Glycine max (L.) Merrill] intercropping in a non-tillage system (NTS). The experiment was set up as a randomized block design with eight treatments and four replicates. The treatments had the following boron (B) rates: [0, 1, 2, 4, and 8 kg ha−1, source: boric acid (H3BO3)] + AAs (2 L ha−1) applied by foliar spraying and the additional treatments [(Control - without B and AAs), 2 kg ha−1 B, 2 L ha−1 AAs and 2 kg ha−1 B + 1 L ha−1 AAs] applied at the end of the elongation and spike beginning of wheat plants and development growth stage (V5) of soybean for two growing seasons. Boron and AAs had no influence on the physiological and yield components and had no increases in the foliar and grain B content in wheat and soybean. No matter the dose, the foliar B + AAs (2 L ha−1) application did not increase the GY in wheat-soybean under a rotational NTS in loamy soil with suitable available B.