ANAEROBICALLY MINERALIZED NITROGEN WITHIN MACROAGGREGATES AS AN INDICATOR OF WHEAT NITROGEN NUTRITION
Keywords:
grain yield, aboveground biomass, total nitrogenAbstract
This work aimed to evaluate the capacity of anaerobically mineralized nitrogen (AN) within large (ANLM), small (ANSM), and total macroaggregates (ANTM) to predict grain yield, aboveground biomass, and total nitrogen plant content of wheat (Triticum aestivum L.) without nitrogen fertilization as compared to AN in bulk soil (ANBS). Eight experiments with wheat without nitrogen fertilization in Mollisols were carried out. The ANBS, ANLM, ANSM, ANTM, grain yield, aboveground biomass, and total nitrogen plant content were determined. The ANLM, ANSM, and ANTM were related to grain yield, aboveground biomass, and total nitrogen plant content (R2=0.34-0.65). The relationships between ANBS and all those variables showed similar predictive capacity. Therefore, AN within macroaggregates was not a better indicator of soil nitrogen supply capacity than ANBS.
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