Towards a Better Understanding of Agronomic Efficiency of Nitrogen: Assessment and Improvement Strategies

Abstract

Agronomic N-use efficiency is the basis for economic and environmental efficiency, and an effective agro-ecosystem management practice, improving nutrient use efficiency, is a crucial challenge for a more sustainable production of horticultural, industrial and cereal crops. However, discrepancy between theory and practice still exists, coming from large gaps in knowledge on net-N immobilization/mineralization rates in agro-ecosystems, as well as on the effects of indigenous and applied N to crop response. A more thorough understanding of these topics is essential to improve N management in agricultural systems. To this end, the present Special Issue collects research findings dealing with different aspects of agronomic efficiency of N in different agro-ecosystems, and environmental impact derived from fertilization management practices. In particular, the Special Issue contains selected papers, which concern a wide range of topics, including analyzing tools, options of management, calculation equation and modeling approaches.

Cassava response to the integrated use of manure and NPK fertilizer in Zambia

“…The AE is an integrated index of two nutrient efficiency indices; recovery efficiency and physiological efficiency ( Ladha et al., 2005 ). For example AE-N is the bases for both economic and environmental efficiencies ( Montemurro and Diacono, 2016 ). Therefore, we calculated AE-N, AE-P, and AE-K using the equation below as in Ladha et al.…”

Influence of fertilization and soil tillage on nitrogen uptake and utilization efficiency of quinoa crop ( Chenopodium quinoa Willd.).

“…Nitrogen is a key limiting element for plant growth, which is also the most complex one considering all of the potential forms and processes in its cycle (Montemurro and Diacono, 2016). It is strongly involved in all of the plant metabolic processes and its rate of uptake and partition is largely determined by supply and demand during the various stages of plant growth (Delogu et al, 1998).…”

Nitrogen Use Efficiency and Yield in Response Graft Bell Pepper Cultivars

“…However, several studies carried out around the world and in different environments, have shown that between 50 and 70% of the total N applied to the soil, is lost as a result of runoff, denitrification, volatilization and leaching (Montemurro and Diacono, 2016). This macroelement, is considered a potential environmental contaminant, and therefore, the efficiency (NUE) of its rational use, is fundamental for agricultural sustainability and natural environmental conservation (Yasuor et al, 2013;Mascleaux-Daubresse et al, 2010).…”