Novel, high-yielding lettuce phenotype generated by urea amine nitrogen nutrition displays contrasting traits to those of nitrate- or ammonium-fertilized plants

Use of Stabilised Amine Nitrogen (SAN) Reduces Required Nitrogen Input and Increases Yield of Onions (Allium cepa L.)

“…In glasshouse trials with tomato [19], it was found that SAN, when compared to other forms of N applied at the same rate, gave significant increases in the yield and a shorter growth habit and in field trials, SAN applied, in addition to the grower standard applications, gave significant increases in marketable red fruit. For lettuce [20], SAN was compared to other forms of N applied at the same rate as in the SAN under glasshouse conditions, where it was found that the SAN resulted in greater harvestable head weights being achieved more quickly. These previous studied showed that when SAN is applied in addition to grower standard N applications and when the amount of N applied in other forms of N is reduced to the same level as that found in SAN, it results in increased yields.…”

“…Previous work showed that nitrogen can be stabilised as a urea-sourced amine N (stabilised amine nitrogen-SAN) that offers yield increases over traditional non-stabilised urea and industry standard N-P-K fertiliser [14]. SAN was shown to increase yield in potato [14][15][16], ornamentals [17], wheat [18], tomato [19] and lettuce [20] when used in a research glasshouse as well as in the field under commercial conditions. In these previous studies, the SAN was applied at lower nitrogen rates than would be traditionally applied with the control forms of nitrogen used.…”

“…In these previous studies, the SAN was applied at lower nitrogen rates than would be traditionally applied with the control forms of nitrogen used. In some studies, rates of the control nitrogen applications were reduced to the same level as in the SAN [14,[17][18][19][20], while in other studies, the control nitrogen application rates were maintained and the SAN was applied in addition [15,16], and in all these cases, the SAN resulted in increased yield and nitrogen use efficiency (NUE). Additionally, the SAN was applied foliarly during the growing season, so it would be present when the plant required it, rather than being applied to the soil, as is common with much agricultural nitrogen application.…”

Effects of the Cultivation Substrate pH and Ammonium-to-Nitrate Nitrogen Ratio on the C:N:P Stoichiometry in Leaves of Cunninghamia lanceolata and Schima superba

“…Microorganisms and environmental factors play pivotal roles in the transformation of various N forms, whereas the uptake and assimilation of N are influenced by both genetic factors within plants and soil pH [7]. Consequently, plant physiologists and those studying N nutrient utilization have devoted considerable attention to investigating the scientific and rational application of N and its formulated fertilizers, aiming to effectively enhance soil N utilization efficiency and foster plant growth and development [8,9]. Thus, simulating diverse soil pH levels and ratios of NH4 + -N to NO3 − -N in cultivation environments can provide a theoretical basis for discerning the optimal soil pH and N nutrient conditions conducive to plant growth, and this method can be used to investigate plant nutrient utilization efficiency.…”