The 0- to 15- and 15- to 30-cm depths of five cultivated Queensland soils and 32 virgin and cultivated western Canadian soils were incubated at a range of moisture contents for 14 days at 35 °C. In most soils, net nitrogen mineralization was linearly related to moisture content in the available range (−0.03 to −4.0 MPa). Optimum moisture for net nitrogen mineralization corresponded to a soil pore water potential of between −0.01 and −0.03 MPa, while that at which no net nitrogen mineralization occurred was close to −4.0 MPa. Initially, the regression for each soil was normalized by the method of Stanford and co-workers, but this technique proved unsatisfactory. However, by normalizing against available moisture (between −0.03 and −4.0 MPa) we succeeded in grouping the soils. The response of all soils could be described by a model of the form: y = bx + (1 − b)x2 constrained to pass through x0, y0 and x1, y1when both axes were scaled between 0 and 1. In the equation, y is net nitrogen mineralized expressed ...

Quantitative relationship between net nitrogen mineralization and moisture content of soils

The sustainability of agricultural practices is of paramount importance in mitigating climate change. This study investigates the impact of alternative fertilization practices on the yield-scaled global warming potential (YS-GWP) in almond orchards. Almond production is a contributor to greenhouse gas emissions, primarily due to nitrogen-based mineral fertilizers. This research aims to identify strategies that reduce the environmental footprint of almond cultivation while maintaining yield. Field experiments were conducted in an almond orchard using three alternative fertigation practices: Advance Grower Practice (AGP), Pump and Fertilize (P&F), and High Frequency Low Concentration (HFLC). AGP followed the current practice producers generally use to meet annual N demand for almond tree growth; P&F is a reduction in applied N rate in response to measured N concentrations in the groundwater so that the added N and groundwater N reach the same total N applied; HFLC is a practice of applying smaller N rates per individual event, with use of a greater number of fertigation events to reach similar total annual N load as other treatments. The results revealed that both P&F and HFLC reduced the YS-GWP compared to the AGP. The HFLC fertigation demonstrated 52% to 78% decrease in GWP per unit of almond yield compared to AGP, while P&F showed 48% to 58% decrease over AGP. These reductions were attributed to the reduced nitrous oxide emissions associated with P&F and HFLC. Further, P&F and HFLC fertigation techniques tended to have higher nitrogen use efficiency than AGP. We demonstrate that adopting alternative fertilization practices can effectively mitigate the environmental footprint of almond orchards while maintaining crop yields. These practices offer viable options for almond growers to reduce greenhouse gas emissions, enhance sustainability, and contribute to climate change mitigation. 

Alternative Fertilization Practices Lead to Improvements in Yield-Scaled Global Warming Potential in Almond Orchards

Nitrogen Mineralization-Water Relations in Soils

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Nitrogen Mineralization-Water Relations in Soils

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Quantitative relationship between net nitrogen mineralization and moisture content of soils

Alternative Fertilization Practices Lead to Improvements in Yield-Scaled Global Warming Potential in Almond Orchards

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