2009
DOI: 10.1626/pps.12.100
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A Knowledge-Based Model for Nitrogen Management in Rice and Wheat

Abstract: : Excessive nitrogen fertilization results in low nitrogen-use effi ciency. To improve nitrogen management for high yield and high nitrogen efficiency in rice and wheat, we developed a knowledge-based nitrogen fertilization model by integrating the quantitative relationship between N fertilization and yield target with respect to N supply and demand balance. The total amount of nitrogen and ratio of basal to top dressing nitrogen could be determined by this nitrogen fertilization model, and the desirable nitro… Show more

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Cited by 14 publications
(10 citation statements)
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“…These are, in fact, approaches to manage fertilizer dose efficiency. Furthermore, the nitrogen fertilization model can be used as guidance for quantifying N fertilization strategy in cereal crop production [45]. This model works as guidance for high yield, not for fertilizer efficiency.…”
Section: Fertilization Methods and Excessive Use Of Fertilizermentioning
confidence: 99%
“…These are, in fact, approaches to manage fertilizer dose efficiency. Furthermore, the nitrogen fertilization model can be used as guidance for quantifying N fertilization strategy in cereal crop production [45]. This model works as guidance for high yield, not for fertilizer efficiency.…”
Section: Fertilization Methods and Excessive Use Of Fertilizermentioning
confidence: 99%
“…NR (kg) is calculated from the crop N requirement per 100 kg grain under maximum grain yield (NRm, kg), and the correction factors for grain yield (FY) and variety (FV) by Eq. (13) (Cao et al, 2009). NRh = NRm × min (FY, 1) -FV (13) where the value of NRm was set as 2.3, obtained from measuring dry weight of plant organs (leaf, haulm, and grain) and leaf area index (LAI).…”
Section: Plant Sampling and Analysismentioning
confidence: 99%
“…(2) The other four indices including grain production efficiency of N (GPE), physiological efficiency of N (PE), N transportation efficiency (NTE) and NHI were calculated historical data under the highest yield (Ling et al, 2005 ) was the maximum grain yield, the average value of the highest yields in the past three years; and α and β were the model coefficients with values of 0.4773 and 0.50, respectively (Cao et al, 2009). 17).…”
Section: Data Analysis and Parameter Calculationmentioning
confidence: 99%
“…Crop models are effective crop management technologies that can be used to simulate and evaluate the effects of different crop management practices [6,7]. Li et al [8] demonstrated that ORYZA is a validated and calibrated crop model system that extrapolates the result of field experiments and accurately examines the effects of crop management practices.…”
Section: Introductionmentioning
confidence: 99%
“…The analysis of CTCs represents a non-invasive 59 procedure that can be serially repeated in order to assess tumor progression in real time, and CTC 60 enumeration may hold promise for improving cancer treatment. CTCs are frequently detected in the 61 peripheral blood of patients with MBC but rarely found in early BC [5][6][7]. The prognostic value of 62 CTCs in MBC is extensively studied and has been corroborated by large studies.…”
mentioning
confidence: 96%