Comparison of phosphorus leaching on different soils to tuning IEEPAgrDLM model
2018
Subbotin, I., Institute for Engineering and Environmental Problems in Agricultural Production - IEEP, Tyarlevo, Pushkinsky distr., Saint Petersburg (Russian Federation) | Briukhanov, A., Institute for Engineering and Environmental Problems in Agricultural Production - IEEP, Tyarlevo, Pushkinsky distr., Saint Petersburg (Russian Federation) | Ogluzdin, A., Institute for Engineering and Environmental Problems in Agricultural Production - IEEP, Tyarlevo, Pushkinsky distr., Saint Petersburg (Russian Federation)
Laboratory study of phosphorus leaching from the plow horizon was conducted. The purpose of the study is to examine and compare the values of leaching phosphorus mass from the plow horizon in order to obtain the values of the coefficients for the IEEPAgrDLM model (Agricultural Diffuse Load Model by IEEP – the Institute for Engineering and Environmental Problems). The IEEPAgrDLM model allows to calculate the diffuse load on water bodies from agricultural fields depending on the field area, field soil nutrient content, type of soil by mechanical composition, doses of mineral and organic fertilizers, structure of crop rotation and distance from the field to the nearest water body. The influence of soil factors was studied. In the experiment 4 types of soil of different mechanical composition were used. Triplicate repeatability was used - for each type of soil, three vessels were used. The laboratory installation was a rack with vessels filled with soil. The vessels have a cover for introduction of water at the top and the filter element, bung with a glass tube and stopper at the bottom. During the study, once every two weeks, water was poured into the vessels and water which passed through the soil was taken. The volumes of water passed through the soil were measured and the concentrations of phosphorus and nitrogen in the water were analysed. Based on the results of a six-month experiment (from April to October 2017), the values of the masses of nitrogen and phosphorus washed from the vessels were obtained. In this article, the results of the experiment on phosphorus are considered. The processing of laboratory data made it possible to calculate the coefficients reflecting the dependence of the mass of phosphorus leaching on the type of soils, which were used to update the coefficient values of the IEEPAgrDLM model.
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