Determining the Effects of Nitrogen Fertilizer and Soil Chemical Properties on Rice Yield: Evidence from a Large-Scale Farm in Hokuriku Region, Japan

Dongpo Li, Teruaki Nanseki, Yosuke Chomei, Takashi Sasaki, Toshihiro Butta, Arata Numata

Research output: Contribution to journalArticle

Abstract

In order to contend with decreasing gross amounts and soaring costs, viable rice production in Japan requires high yield levels. This study assessed the effects of nitrogen fertilizer and soil chemical properties on rice yield. Data were recorded in 2014 and 2015 from 93 paddy fields at a farm larger than 30 ha in Hokuriku Region, Japan. Koshihikari, the most widely planted rice variety in Japan, was cultivated in the sampled fields. Soil chemical properties were quantified using 12 variables, namely pH, cation exchange capacity, phosphoric acid content, silicic acid content, content and saturation of the three exchangeable bases, and the equivalent ratios of calcium to magnesium and magnesium to potassium. Three principal components (PCs) were extracted explaining 76% of the total variation and comprised mainly the magnesium (PC1), potassium (PC2), and acidity–basicity (PC3) variables. The multivariate regression model retained significant determinants, with the standardized principal components (SPCs) and the time trend explaining 66.6% of the total variation. The results showed that higher squared values of SPC1 positively related to rice yield, while SPC2 and SPC3 increased rice yield up to a threshold, at which point increases plateaued. These findings were then confirmed through correlation analyses between each soil chemical property and both the PCs and rice yield. The effect of nitrogen fertilizer was insignificant, due to low variation among the paddy fields in which the special cultivation regime was adopted. Further investigations were conducted into countermeasures to improve soil chemical properties, especially those highly related to SPC2 and SPC3.

Original languageEnglish
JournalInternational Journal of Plant Production
DOIs
Publication statusPublished - Jan 1 2019

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soil chemical properties
nitrogen fertilizers
Japan
rice
farms
magnesium
paddies
potassium
silicic acid
large farms
phosphoric acid
cation exchange capacity
calcium

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science

Cite this

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title = "Determining the Effects of Nitrogen Fertilizer and Soil Chemical Properties on Rice Yield: Evidence from a Large-Scale Farm in Hokuriku Region, Japan",
abstract = "In order to contend with decreasing gross amounts and soaring costs, viable rice production in Japan requires high yield levels. This study assessed the effects of nitrogen fertilizer and soil chemical properties on rice yield. Data were recorded in 2014 and 2015 from 93 paddy fields at a farm larger than 30 ha in Hokuriku Region, Japan. Koshihikari, the most widely planted rice variety in Japan, was cultivated in the sampled fields. Soil chemical properties were quantified using 12 variables, namely pH, cation exchange capacity, phosphoric acid content, silicic acid content, content and saturation of the three exchangeable bases, and the equivalent ratios of calcium to magnesium and magnesium to potassium. Three principal components (PCs) were extracted explaining 76{\%} of the total variation and comprised mainly the magnesium (PC1), potassium (PC2), and acidity–basicity (PC3) variables. The multivariate regression model retained significant determinants, with the standardized principal components (SPCs) and the time trend explaining 66.6{\%} of the total variation. The results showed that higher squared values of SPC1 positively related to rice yield, while SPC2 and SPC3 increased rice yield up to a threshold, at which point increases plateaued. These findings were then confirmed through correlation analyses between each soil chemical property and both the PCs and rice yield. The effect of nitrogen fertilizer was insignificant, due to low variation among the paddy fields in which the special cultivation regime was adopted. Further investigations were conducted into countermeasures to improve soil chemical properties, especially those highly related to SPC2 and SPC3.",
author = "Dongpo Li and Teruaki Nanseki and Yosuke Chomei and Takashi Sasaki and Toshihiro Butta and Arata Numata",
year = "2019",
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T1 - Determining the Effects of Nitrogen Fertilizer and Soil Chemical Properties on Rice Yield

T2 - Evidence from a Large-Scale Farm in Hokuriku Region, Japan

AU - Li, Dongpo

AU - Nanseki, Teruaki

AU - Chomei, Yosuke

AU - Sasaki, Takashi

AU - Butta, Toshihiro

AU - Numata, Arata

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Y1 - 2019/1/1

N2 - In order to contend with decreasing gross amounts and soaring costs, viable rice production in Japan requires high yield levels. This study assessed the effects of nitrogen fertilizer and soil chemical properties on rice yield. Data were recorded in 2014 and 2015 from 93 paddy fields at a farm larger than 30 ha in Hokuriku Region, Japan. Koshihikari, the most widely planted rice variety in Japan, was cultivated in the sampled fields. Soil chemical properties were quantified using 12 variables, namely pH, cation exchange capacity, phosphoric acid content, silicic acid content, content and saturation of the three exchangeable bases, and the equivalent ratios of calcium to magnesium and magnesium to potassium. Three principal components (PCs) were extracted explaining 76% of the total variation and comprised mainly the magnesium (PC1), potassium (PC2), and acidity–basicity (PC3) variables. The multivariate regression model retained significant determinants, with the standardized principal components (SPCs) and the time trend explaining 66.6% of the total variation. The results showed that higher squared values of SPC1 positively related to rice yield, while SPC2 and SPC3 increased rice yield up to a threshold, at which point increases plateaued. These findings were then confirmed through correlation analyses between each soil chemical property and both the PCs and rice yield. The effect of nitrogen fertilizer was insignificant, due to low variation among the paddy fields in which the special cultivation regime was adopted. Further investigations were conducted into countermeasures to improve soil chemical properties, especially those highly related to SPC2 and SPC3.

AB - In order to contend with decreasing gross amounts and soaring costs, viable rice production in Japan requires high yield levels. This study assessed the effects of nitrogen fertilizer and soil chemical properties on rice yield. Data were recorded in 2014 and 2015 from 93 paddy fields at a farm larger than 30 ha in Hokuriku Region, Japan. Koshihikari, the most widely planted rice variety in Japan, was cultivated in the sampled fields. Soil chemical properties were quantified using 12 variables, namely pH, cation exchange capacity, phosphoric acid content, silicic acid content, content and saturation of the three exchangeable bases, and the equivalent ratios of calcium to magnesium and magnesium to potassium. Three principal components (PCs) were extracted explaining 76% of the total variation and comprised mainly the magnesium (PC1), potassium (PC2), and acidity–basicity (PC3) variables. The multivariate regression model retained significant determinants, with the standardized principal components (SPCs) and the time trend explaining 66.6% of the total variation. The results showed that higher squared values of SPC1 positively related to rice yield, while SPC2 and SPC3 increased rice yield up to a threshold, at which point increases plateaued. These findings were then confirmed through correlation analyses between each soil chemical property and both the PCs and rice yield. The effect of nitrogen fertilizer was insignificant, due to low variation among the paddy fields in which the special cultivation regime was adopted. Further investigations were conducted into countermeasures to improve soil chemical properties, especially those highly related to SPC2 and SPC3.

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