Nitrate leaching and soil moisture prediction with the LEACHM model

1991 ◽  
Vol 27 (2-3) ◽  
pp. 171-180 ◽  
Author(s):  
C. Ramos ◽  
E. A. Carbonell
Keyword(s):  
Soil Moisture ◽  
Nitrate Leaching ◽  
Leachm Model

scholarly journals Nitrate-Nitrogen Leaching and Modeling in Intensive Agriculture Farmland in China

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ligang Xu ◽  
Hailin Niu ◽  
Jin Xu ◽  
Xiaolong Wang
Keyword(s):  
Nitrate Leaching ◽  
Soil Profile ◽  
Nitrate Nitrogen ◽  
Initial Conditions ◽  
Simulated Data ◽  
Intensive Agriculture ◽  
Health Concern ◽  
N Leaching ◽  
And Migration ◽  
Leachm Model

Protecting water resources from nitrate-nitrogen (NO3-N) contamination is an important public health concern and a major national environmental issue in China. Loss of NO3-N in soils due to leaching is not only one of the most important problems in agriculture farming, but is also the main factor causing nitrogen pollution in aquatic environments. Three typical intensive agriculture farmlands in Jiangyin City in China are selected as a case study for NO3-N leaching and modeling in the soil profile. In this study, the transport and fate of NO3-N within the soil profile and nitrate leaching to drains were analyzed by comparing field data with the simulation results of the LEACHM model. Comparisons between measured and simulated data indicated that the NO3-N concentrations in the soil and nitrate leaching to drains are controlled by the fertilizer practice, the initial conditions and the rainfall depth and distribution. Moreover, the study reveals that the LEACHM model gives a fair description of the NO3-N dynamics in the soil and subsurface drainage at the field scale. It can also be concluded that the model after calibration is a useful tool to optimize as a function of the combination “climate-crop-soil-bottom boundary condition” the nitrogen application strategy resulting for the environment in an acceptable level of nitrate leaching. The findings in this paper help to demonstrate the distribution and migration of nitrogen in intensive agriculture farmlands, as well as to explore the mechanism of groundwater contamination resulting from agricultural activities.

Water Movement and Nitrate Leaching in a Nigerian Savanna Soil

1976 ◽  
Vol 12 (1) ◽  
pp. 69-79 ◽  
Author(s):  
M. J. Jones
Keyword(s):  
Soil Moisture ◽  
Nitrate Leaching ◽  
Water Movement ◽  
Growing Season ◽  
Nitrate Content ◽  
Deep Drainage ◽  
Nigerian Savanna ◽  
Savanna Soil ◽  
Leaching Efficiency

SUMMARYChanges in soil moisture and nitrate content in the top 75 cm of soil in bare and cropped plots were followed throughout the growing season in a Ferruginous savanna soil. A low leaching efficiency, of 0.38–0.66 cm/cm rainfall, was related to very slow wetting of the subsoil, a phenomenon which could be explained satisfactorily only by assuming that part of the rain passed through the profile relatively quickly in the larger pores. However, losses of fertilizer nitrate to deep drainage by this rapid percolation were only 25% of that applied, at most, the greater part remaining in the top 45 cm of soil for almost the whole growing season, thus explaining why only small responses have been obtained at this site to delayed or split applications of nitrogen.

Biochar reduced nitrate leaching and improved soil moisture content without yield improvements in a four-year field study

2017 ◽  
Vol 237 ◽  
pp. 80-94 ◽  
Author(s):  
Ghulam Haider ◽  
Diedrich Steffens ◽  
Gerald Moser ◽  
Christoph Müller ◽  
Claudia I. Kammann
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Field Study ◽  
Nitrate Leaching ◽  
Soil Moisture Content

Modifying the LEACHM model for process-based prediction of nitrate leaching from cropped Andosols

2013 ◽  
Vol 373 (1-2) ◽  
pp. 609-625 ◽  
Author(s):  
Kei Asada ◽  
Sadao Eguchi ◽  
Rieko Urakawa ◽  
Sunao Itahashi ◽  
Tsuneo Matsumaru ◽  
...  
Keyword(s):  
Nitrate Leaching ◽  
Leachm Model

Nitrate leaching as influenced by fertilization in the Brown soil zone

1993 ◽  
Vol 73 (4) ◽  
pp. 387-397 ◽  
Author(s):  
C. A. Campbell ◽  
R. P. Zentner ◽  
F. Selles ◽  
O. O. Akinremi
Keyword(s):  
Soil Moisture ◽  
Nitrate Leaching ◽  
Root Zone ◽  
N Uptake ◽  
Triticum Aestivum L ◽  
N Leaching ◽  
Fertilizer N ◽  
Brown Soil ◽  
Soil Zone ◽  
N Rates

The possibility of nitrates being leached into groundwater supplies from improper use of fertilizers is a concern to society. Two experiments were conducted on a loam soil in the Brown soil zone at Swift Current, Saskatchewan. In the first experiment, continuous wheat (Triticum aestivum L.), grown under various fertilizer-N management systems and with and without cereal trap strips (tall stubble, 0.4–0.6 m) to capture snow and enhance soil-moisture storage, was compared with short stubble cut at the standard height (0.15–0.2 m). Prior to seeding in spring 1991, tall stubble had stored 14.7 ha-cm of soil moisture at 0–1.2-m depth compared with 10.9 ha-cm under short-stubble treatment. Because growing-season precipitation in 1991 was much higher than normal (302 mm from 1 May to 31 My), considerable NO3-N was leached below the rooting zone of wheat (1.2 m), particularly in the tall-stubble treatment. Leaching patterns were as expected in short stubble, with major leaching occurring only at the highest N rate (125 kg ha−1), where yield and N-uptake response had levelled off. However, in tall stubble, the amount of NO3-N leached beyond the root zone under the 0 and 25 kg N ha−1 rates was similar to that under the 125 kg N ha−1 rate. This result was attributed to poor tillering obtained at low N rates, which contributed to lower evapotranspiration, thereby permitting more moisture to be leached and enhancing N mineralization. When we used a leaching model (NLEAP) to simulate our results, it gave lower estimates of NO3 leached and did not reveal the interaction of NO3-N leaching with N rates that was observed under tall stubble. The second experiment measured soil NO3-N distribution to 2.4 m under two fallow–wheat–wheat systems after a 24-yr period. One system received only N, the other, N + P fertilizer. The results corroborated those obtained under tall stubble in the first experiment: the poorly fertilized system had the most NO3-N below the root zone. The results of this study suggest that the key to reducing nitrate leaching is the adoption of proper fertilization practices, since too little fertilization may potentially be as detrimental to groundwater pollution as too much. Key words: Fertilizer N, N uptake, snow management, crop rotations, NO3 leaching

scholarly journals Analysis of Nitrate Pollution Pathways on a Vulnerable Agricultural Plain in Slovenia: Taking the Local Approach to Balance Ecosystem Services of Food and Water

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 707 ◽  
Author(s):  
Miha Curk ◽  
Matjaž Glavan ◽  
Marina Pintar
Keyword(s):  
Soil Moisture ◽  
Land Management ◽  
Nitrate Leaching ◽  
Agricultural Land ◽  
Swat Model ◽  
Nitrate Pollution ◽  
Soil Types ◽  
Management Scenarios ◽  
Local Approach ◽  
Vegetable Rotation

Groundwater pollution with nitrate of agricultural origin is a major problem in many countries. A great deal of effort is focused on finding ways to reduce leaching from agricultural land. In this study, different land management scenarios were evaluated with the SWAT model in order to determine which are the most effective in reducing nitrate leaching on specific soil types in the Krška kotlina alluvial plain (Slovenia). The area is very important both for agriculture production and drinking water resources. The model was calibrated for three soil moisture field trial sites, each representing one major soil type of the area. Simulated soil moisture values were in good agreement with the observed values (PBIAS (percent bias) ±25%). Of the nine land management scenarios that were evaluated, vegetable rotation caused the most nitrate leaching on all soil types, but it fared better on Cambisol than on Fluvisol. Orchards on the other hand leached the least amount of nitrate, but also fared better on Cambisol. Presented studies should be considered as a preliminary stage in the study of nitrate pollution in the investigated area. Results show that nitrate leaching varies for different land management scenarios on different soil types. Further work should concentrate on field trials to evaluate the impacts of reduced fertilization on nitrate leaching and both crop yield and quality on different soil types.

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