Abstract
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.
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Claims 5
Claim · model-written summary
Tropical rice gets a major part of its nitrogen uptake from soil rather than fertilizer.
Verbatim
e0“Tropical rice obtains a major portion of its N uptake from the soil as opposed to fertiliser nitrogen”
Claim · model-written summary
Authors recommend basing nitrogen fertilizer rates on available soil nitrogen.
Verbatim
e0“Therefore N‐fertiliser recommendations should be based on the availability of soil nitrogen”
e1“Tropical rice”
Claim · model-written summary
The total nutrient model estimates rice yield from an aggregate of soil and applied nitrogen.
Verbatim
e0“total nutrient model, developed by Hildreth, which estimates yield as a function of an aggregated nitrogen variable incorporating both soil and applied N”
e1“Tropical rice”
Claim · model-written summary
The updated model provides farm-specific optimal nitrogen rates tailored to soil nutrient availability.
Verbatim
e0“total nutrient model to provide farm specific optimal N‐rates tailored to soil nutrient availability”
e1“Tropical rice”
Claim · model-written summary
The method applies only to internally homogeneous samples.
Verbatim
e0“The methodology, however, is only applicable to samples characterised by a high degree of internal homogeneity”
e1“Tropical rice”