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Winter wheat is the main cereal crop in Northern China, and excessive nitrogen (N) fertilization and irrigation are employed in recent years to ensure a high grain yield. A high amount of N was lost via leaching, which exacerbated the risk of non-point source pollution and further increased the resource waste. It is highly necessary to clarify the characteristics and influencing factors of N leaching loss during the winter wheat season in the region. The literature on N leaching loss from the winter wheat production in Northern China, published from 2000 to 2023 was screened, and linear, multiple-factor regression models, as well as random forest and XGBoost models were established in the study. The research showed that the N leaching during the winter wheat season was mainly affected by the fertilizer rate and irrigation water, as well as soil properties (pH, clay and sand content), and was effectively inhibited by crop straw incorporation. Multiple variable combinations were constructed based on the results of importance analysis and stepwise regression. Grid search method, Bayesian and the combination of Bayesian and Early stopping were used to optimize the model parameters. The models constructed through Random Forest, based on all influential variables and based on the influential variables screened by stepwise, had the R2 of 0.628 and 0.708, respectively, and the R2 for the corresponding models constructed through XGBoost were 0.745 and 0.722, respectively. This indicates that the prediction effects of N leaching based on Random Forest and XGBoost were much better than the linear and multiple-factor regression models. The influence of multiple factors on N leaching was comprehensively considered in the machine learning models, and the effects of prediction were better when choosing the influential variables screened by empirical statistical methods as independent variables. The results of this study can provide technical support for reducing the N leaching in the winter wheat production in Northern China.
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为明确华北地区冬小麦生产中的氮淋失特征及影响因素,整合了2000~2023年发表的、在华北地区进行的冬小麦氮淋失试验研究,分别构建了单因素和多因素回归模型,以及基于机器学习的随机森林和XGBoost模型,对农田氮淋失进行定量分析.研究表明,氮肥和水分投入量、土壤性质(pH值、粘粒和砂粒含量)是影响华北地区冬小麦生产中氮淋失的主要因素,秸秆还田能够有效抑制氮淋失.利用随机森林方法,基于全部预测变量和逐步回归筛选后预测变量构建的模型拟合优度分别为0.628和0.708,而经过贝叶斯搜参和早停法优化后构建的XGBoost模型拟合优度分别为0.745和0.722.机器学习模型构建过程中充分考虑了多因素对冬小麦生产中氮淋失的影响,采用经验统计筛选的预测指标构建的模型拟合优度高,适用性好,对于华北地区冬小麦农田氮淋失的阻控具有重要技术支撑.
, correspAuthors=孟凡乔, authorNote=null, correspAuthorsNote=
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, authorsList=李涛宇, 许秀春, 杨轩, 崔斌, 陈恒爱, 赵晓莹, 袁宁, 孟凡乔)}, authors=[Author(id=1241049974927061161, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=yztaoyuli@163.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1241049975350685882, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, authorId=1241049974927061161, language=EN, stringName=Tao-yu LI, firstName=Tao-yu, middleName=null, lastName=LI, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=College of Resources and Environmental Sciences, Beijing Key Laboratory of Prevention, Control and Restoration of Farmland Soil Pollution, China Agricultural University, Beijing 100193, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1241049975526846664, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, authorId=1241049974927061161, language=CN, stringName=李涛宇, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=中国农业大学资源与环境学院农田土壤污染防控与修复北京市重点实验室,北京 100193, bio={"content":"
李涛宇(2003-),男,江苏扬州人,本科生,研究方向为土壤氮循环.发表论文1篇.yztaoyuli@163.com.
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李涛宇(2003-),男,江苏扬州人,本科生,研究方向为土壤氮循环.发表论文1篇.yztaoyuli@163.com.
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Distribution histogram of total N leaching loss and logarithmic total N leaching loss during the winter wheat season, figureFileSmall=90iJb1+lVW6vYI8CeR3hbA==, figureFileBig=Odwbjh86A6c6L5YNI9e3Kg==, tableContent=null), ArticleFig(id=1241049987497390804, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=图1, caption=
冬小麦农田总氮淋失量分布直方图和总氮淋失量取对数分布直方图, figureFileSmall=90iJb1+lVW6vYI8CeR3hbA==, figureFileBig=Odwbjh86A6c6L5YNI9e3Kg==, tableContent=null), ArticleFig(id=1241049988365611758, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=EN, label=Fig.2, caption=
Correlation between total N leaching loss and predictive variables during the winter wheat season, figureFileSmall=/An1vFvXYEhWxjUvHLsvuw==, figureFileBig=bBWGOOLh8t7FUJUisr78wg==, tableContent=null), ArticleFig(id=1241049988789236472, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=图2, caption=
冬小麦农田总氮淋失量与预测变量的相关性分析, figureFileSmall=/An1vFvXYEhWxjUvHLsvuw==, figureFileBig=bBWGOOLh8t7FUJUisr78wg==, tableContent=null), ArticleFig(id=1241049989116392203, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=EN, label=Fig.3, caption=
Importance analysis of various predictive variables for total N leaching loss during the winter wheat season, figureFileSmall=qqoD22cz0v/NLWNaRrhPBA==, figureFileBig=Hww+OMJCWyBKLieUs9xCuQ==, tableContent=null), ArticleFig(id=1241049989258998555, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=图3, caption=
冬小麦农田总氮淋失量各预测变量的重要性分析, figureFileSmall=qqoD22cz0v/NLWNaRrhPBA==, figureFileBig=Hww+OMJCWyBKLieUs9xCuQ==, tableContent=null), ArticleFig(id=1241049989418382122, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=EN, label=Fig.4, caption=
Regression simulation of total N leaching loss with fertilizer N rate, total N rate and water input in winter wheat fields, figureFileSmall=XzrjTcl3zPa3e+PRdlRIbQ==, figureFileBig=oVeYcSxUe345HKfAEWkkVw==, tableContent=null), ArticleFig(id=1241049989598737207, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=图4, caption=
冬小麦农田总氮淋失量与化肥施氮量、总施氮量和水分投入量的回归模拟, figureFileSmall=XzrjTcl3zPa3e+PRdlRIbQ==, figureFileBig=oVeYcSxUe345HKfAEWkkVw==, tableContent=null), ArticleFig(id=1241049989829423940, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=EN, label=Fig.5, caption=
Two factor regression simulation of total N leaching loss with fertilizer N rate and water input during the winter wheat season, figureFileSmall=SPQWppcftOPsMBA9nLtGVA==, figureFileBig=dZyNEcjf+ItjNedqVAiMPw==, tableContent=null), ArticleFig(id=1241049990005584719, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=图5, caption=
冬小麦农田总氮淋失量与化肥施氮量和水分投入量的双因素回归模拟, figureFileSmall=SPQWppcftOPsMBA9nLtGVA==, figureFileBig=dZyNEcjf+ItjNedqVAiMPw==, tableContent=null), ArticleFig(id=1241049990194328414, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=EN, label=Table 1, caption=
Parameters of multiple regression model for total N leaching loss in winter wheat fields
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 系数预测值 | 标准差 | t值 | P值 |
|---|
| 截距Intercept | -113.721 | 35.454 | -3.208 | 0.002 |
| 化肥施氮量Fertilizer N rate | 0.066 | 0.012 | 5.341 | <0.001 |
| 秸秆还田输入氮量Straw incorporation N rate | -0.022 | 0.025 | -0.871 | 0.385 |
| 有机肥输入氮量Organic fertilizer N rate | 0.059 | 0.025 | 2.338 | 0.020 |
| 水分投入量Water input | 0.085 | 0.015 | 5.874 | <0.001 |
| 土壤pH值Soil pH | 6.051 | 3.364 | 1.799 | 0.074 |
| 土壤全氮含量Soil total N | 12.583 | 6.015 | 2.092 | 0.038 |
| 有机质含量Soil organic matter | -0.340 | 0.431 | -0.789 | 0.431 |
| 粘粒含量Clay content | 0.892 | 0.165 | 5.408 | <0.001 |
| 砂粒含量Sand content | 0.314 | 0.087 | 3.605 | <0.001 |
| 采样深度Sampling depth | -0.010 | 0.032 | -0.322 | 0.747 |
| 还田秸秆量Straw incorporation | — | — | — | — |
| 总施氮量Total N rate | — | — | — | — |
| F值F statistic: 10.311 | | P值P-value: 6.43×10-14 |
| 拟合优度Multiple R2: 0.344 | | 修正拟合优度Adjusted R2: 0.310 |
), ArticleFig(id=1241049990492124016, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=表1, caption=
冬小麦农田总氮淋失量的多元回归模型参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 系数预测值 | 标准差 | t值 | P值 |
|---|
| 截距Intercept | -113.721 | 35.454 | -3.208 | 0.002 |
| 化肥施氮量Fertilizer N rate | 0.066 | 0.012 | 5.341 | <0.001 |
| 秸秆还田输入氮量Straw incorporation N rate | -0.022 | 0.025 | -0.871 | 0.385 |
| 有机肥输入氮量Organic fertilizer N rate | 0.059 | 0.025 | 2.338 | 0.020 |
| 水分投入量Water input | 0.085 | 0.015 | 5.874 | <0.001 |
| 土壤pH值Soil pH | 6.051 | 3.364 | 1.799 | 0.074 |
| 土壤全氮含量Soil total N | 12.583 | 6.015 | 2.092 | 0.038 |
| 有机质含量Soil organic matter | -0.340 | 0.431 | -0.789 | 0.431 |
| 粘粒含量Clay content | 0.892 | 0.165 | 5.408 | <0.001 |
| 砂粒含量Sand content | 0.314 | 0.087 | 3.605 | <0.001 |
| 采样深度Sampling depth | -0.010 | 0.032 | -0.322 | 0.747 |
| 还田秸秆量Straw incorporation | — | — | — | — |
| 总施氮量Total N rate | — | — | — | — |
| F值F statistic: 10.311 | | P值P-value: 6.43×10-14 |
| 拟合优度Multiple R2: 0.344 | | 修正拟合优度Adjusted R2: 0.310 |
), ArticleFig(id=1241049992236954494, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=EN, label=Table 2, caption=
Parameters of stepwise regression model for total N leaching loss in winter wheat fields
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 系数预测值 | 标准化系数 | 标准差 | t值 | P值 |
|---|
| 截距Intercept | -129.773 | | 23.956 | -5.417 | <0.001 |
| 总施氮量Total N rate | 0.064 | 0.395 | 0.012 | 5.270 | <0.001 |
| 还田秸秆量Straw incorporation | -0.001 | -0.203 | 0.000 | -3.019 | 0.003 |
| 水分投入量Water input | 0.087 | 0.470 | 0.013 | 6.642 | <0.001 |
| 粘粒含量Clay content | 0.893 | 0.489 | 0.151 | 5.926 | <0.001 |
| 砂粒含量Sand content | 0.305 | 0.272 | 0.082 | 3.708 | <0.001 |
| 土壤pH值Soil pH | 7.472 | 0.201 | 2.644 | 2.826 | 0.005 |
| 土壤全氮含量Soil total N | 11.170 | 0.132 | 5.525 | 2.022 | 0.045 |
| F值F statistic: 14.3 | | | | P值P-value: 4.32×10-15 |
| 拟合优度Multiple R2: 0.335 | | | | 修正拟合优度Adjusted R2: 0.311 |
), ArticleFig(id=1241049992580887432, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=表2, caption=
冬小麦农田总氮淋失量的逐步回归模型参数
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| 参数 | 系数预测值 | 标准化系数 | 标准差 | t值 | P值 |
|---|
| 截距Intercept | -129.773 | | 23.956 | -5.417 | <0.001 |
| 总施氮量Total N rate | 0.064 | 0.395 | 0.012 | 5.270 | <0.001 |
| 还田秸秆量Straw incorporation | -0.001 | -0.203 | 0.000 | -3.019 | 0.003 |
| 水分投入量Water input | 0.087 | 0.470 | 0.013 | 6.642 | <0.001 |
| 粘粒含量Clay content | 0.893 | 0.489 | 0.151 | 5.926 | <0.001 |
| 砂粒含量Sand content | 0.305 | 0.272 | 0.082 | 3.708 | <0.001 |
| 土壤pH值Soil pH | 7.472 | 0.201 | 2.644 | 2.826 | 0.005 |
| 土壤全氮含量Soil total N | 11.170 | 0.132 | 5.525 | 2.022 | 0.045 |
| F值F statistic: 14.3 | | | | P值P-value: 4.32×10-15 |
| 拟合优度Multiple R2: 0.335 | | | | 修正拟合优度Adjusted R2: 0.311 |
), ArticleFig(id=1241049992853517206, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=EN, label=Table 3, caption=
Hyperparameter range
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| 模型 | 超参数 | 参数范围 |
|---|
| 网格搜索法 | 贝叶斯搜索法 |
|---|
随机森林 Random Forest | 决策树的数量(n_estimators) | 50,100,150 | 50~200 |
| 树的最大深度(max_depth) | 10,15,20 | 1~20 |
| 节点最小分裂样本数(min_samples_split) | 2,4,8 | 2~10 |
| 叶子节点最小样本数(min_samples_leaf) | 1,2,4 | 1~10 |
| 决策树考虑的特征比例(max_features) | 0.3,0.4,0.5 | 0.1~1.0 |
XGBoost eXtreme Gradient Boosting | 决策树的数量(n_estimators) | — | 50~200 |
| 树的最大深度(max_depth) | — | 3~10 |
| 学习率(learning_rate) | — | 0.01~0.4 |
| 叶子节点中最小样本权重和(min_child_weight) | — | 3~9 |
| 样本训练比例(subsample) | — | 0.3~0.8 |
| 决策树考虑的特征比例(colsample_bytree) | — | 0.1~1.0 |
| gamma | — | 0.01~0.1 |
| alpha | — | 1.0~1.5 |
| lambda | — | 0~0.1 |
), ArticleFig(id=1241049993088398247, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=表3, caption=
超参数范围
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| 模型 | 超参数 | 参数范围 |
|---|
| 网格搜索法 | 贝叶斯搜索法 |
|---|
随机森林 Random Forest | 决策树的数量(n_estimators) | 50,100,150 | 50~200 |
| 树的最大深度(max_depth) | 10,15,20 | 1~20 |
| 节点最小分裂样本数(min_samples_split) | 2,4,8 | 2~10 |
| 叶子节点最小样本数(min_samples_leaf) | 1,2,4 | 1~10 |
| 决策树考虑的特征比例(max_features) | 0.3,0.4,0.5 | 0.1~1.0 |
XGBoost eXtreme Gradient Boosting | 决策树的数量(n_estimators) | — | 50~200 |
| 树的最大深度(max_depth) | — | 3~10 |
| 学习率(learning_rate) | — | 0.01~0.4 |
| 叶子节点中最小样本权重和(min_child_weight) | — | 3~9 |
| 样本训练比例(subsample) | — | 0.3~0.8 |
| 决策树考虑的特征比例(colsample_bytree) | — | 0.1~1.0 |
| gamma | — | 0.01~0.1 |
| alpha | — | 1.0~1.5 |
| lambda | — | 0~0.1 |
), ArticleFig(id=1241049993201644468, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=EN, label=Table 4, caption=
Evaluation results of different models
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| 预测变量组合 | 基于不同优化方法下不同模型R2 |
|---|
| 随机森林网格搜索法 | 随机森林贝叶斯搜参 | XGBoost贝叶斯搜参 | XGboost贝叶斯搜参+早停法 | 多因素线性回归 |
|---|
| (1)全部预测变量 All predicted variables | 0.627 | 0.628 | 0.702 | 0.745 | 0.344 |
| (2)水分投入量,化肥施氮量,砂粒含量,粘粒含量,土壤pH值,有机质含量,土壤全氮含量,土壤类型,秸秆还田输入氮量,有机肥输入氮量 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter,Soil total N,Soil type,Straw incorporation N rate,Organic fertilizer N rate | 0.609 | 0.607 | 0.681 | 0.671 | 0.343 |
| (3)水分投入量,化肥施氮量,砂粒含量,粘粒含量,土壤pH值,有机质含量,土壤全氮含量,土壤类型,秸秆还田输入氮量 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter,Soil total N,Soil type,Straw incorporation N rate | 0.625 | 0.624 | 0.692 | 0.699 | 0.325 |
| (4)水分投入量,化肥施氮量,砂粒含量,粘粒含量,土壤pH值,有机质含量,土壤全氮含量,土壤类型 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter,Soil total N,Soil type | 0.540 | 0.542 | 0.563 | 0.567 | 0.324 |
| (5)水分投入量,化肥施氮量,砂粒含量,黏粒含量,土壤pH值,有机质含量,土壤全氮含量 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter,Soil total N | 0.543 | 0.546 | 0.589 | 0.585 | 0.324 |
| (6)水分投入量,化肥施氮量,砂粒含量,粘粒含量,土壤pH值,有机质含量 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter | 0.537 | 0.542 | 0.575 | 0.524 | 0.292 |
| (7)水分投入量,化肥施氮量,砂粒含量,黏粒含量,土壤pH值 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH | 0.530 | 0.531 | 0.560 | 0.553 | 0.289 |
| (8)水分投入量,化肥施氮量,砂粒含量,黏粒含量 Water input,Fertilizer N rate,Sand content,Clay content | 0.523 | 0.524 | 0.549 | 0.519 | 0.279 |
| (9)水分投入量,化肥施氮量 Water input,Fertilizer N rate | 0.310 | 0.311 | 0.607 | 0.610 | 0.127 |
| (10)总施氮量,还田秸秆量,水分投入量,砂粒含量,粘粒含量,土壤pH值,土壤全氮含量 Total N rate,Straw incorporation,Water input,Sand content,Clay content,Soil pH,Soil total N | 0.705 | 0.708 | 0.710 | 0.722 | 0.335 |
), ArticleFig(id=1241049993486857151, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1241049967779967921, language=CN, label=表4, caption=
不同模型性能评价对比
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| 预测变量组合 | 基于不同优化方法下不同模型R2 |
|---|
| 随机森林网格搜索法 | 随机森林贝叶斯搜参 | XGBoost贝叶斯搜参 | XGboost贝叶斯搜参+早停法 | 多因素线性回归 |
|---|
| (1)全部预测变量 All predicted variables | 0.627 | 0.628 | 0.702 | 0.745 | 0.344 |
| (2)水分投入量,化肥施氮量,砂粒含量,粘粒含量,土壤pH值,有机质含量,土壤全氮含量,土壤类型,秸秆还田输入氮量,有机肥输入氮量 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter,Soil total N,Soil type,Straw incorporation N rate,Organic fertilizer N rate | 0.609 | 0.607 | 0.681 | 0.671 | 0.343 |
| (3)水分投入量,化肥施氮量,砂粒含量,粘粒含量,土壤pH值,有机质含量,土壤全氮含量,土壤类型,秸秆还田输入氮量 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter,Soil total N,Soil type,Straw incorporation N rate | 0.625 | 0.624 | 0.692 | 0.699 | 0.325 |
| (4)水分投入量,化肥施氮量,砂粒含量,粘粒含量,土壤pH值,有机质含量,土壤全氮含量,土壤类型 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter,Soil total N,Soil type | 0.540 | 0.542 | 0.563 | 0.567 | 0.324 |
| (5)水分投入量,化肥施氮量,砂粒含量,黏粒含量,土壤pH值,有机质含量,土壤全氮含量 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter,Soil total N | 0.543 | 0.546 | 0.589 | 0.585 | 0.324 |
| (6)水分投入量,化肥施氮量,砂粒含量,粘粒含量,土壤pH值,有机质含量 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH,Soil organic matter | 0.537 | 0.542 | 0.575 | 0.524 | 0.292 |
| (7)水分投入量,化肥施氮量,砂粒含量,黏粒含量,土壤pH值 Water input,Fertilizer N rate,Sand content,Clay content,Soil pH | 0.530 | 0.531 | 0.560 | 0.553 | 0.289 |
| (8)水分投入量,化肥施氮量,砂粒含量,黏粒含量 Water input,Fertilizer N rate,Sand content,Clay content | 0.523 | 0.524 | 0.549 | 0.519 | 0.279 |
| (9)水分投入量,化肥施氮量 Water input,Fertilizer N rate | 0.310 | 0.311 | 0.607 | 0.610 | 0.127 |
| (10)总施氮量,还田秸秆量,水分投入量,砂粒含量,粘粒含量,土壤pH值,土壤全氮含量 Total N rate,Straw incorporation,Water input,Sand content,Clay content,Soil pH,Soil total N | 0.705 | 0.708 | 0.710 | 0.722 | 0.335 |
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