FERTILISER RECOMMENDATIONS BASED ON SOIL NITROGEN LEVELS: A TOTAL NUTRIENT MODEL
将土壤科学家对有效氮的量化工作整合到全养分模型中，为农场提供基于土壤养分有效性的最佳氮肥施用量，但仅适用于内部高度同质的样本。
Tropical rice obtains a major portion of its N uptake from the soil as opposed to fertiliser nitrogen. Therefore N‐fertiliser recommendations should be based on the availability of soil nitrogen. This can be done by applying a total nutrient model, developed by Hildreth, which estimates yield as a function of an aggregated nitrogen variable incorporating both soil and applied N. This paper incorporates recent work on the quantification of available N, by soil scientists, into the total nutrient model to provide farm specific optimal N‐rates tailored to soil nutrient availability. The methodology, however, is only applicable to samples characterised by a high degree of internal homogeneity.