Influence of Soil Fertilization Systems and Crop Rotation on Soil Chemical Properties

Abstract

The purpose of this research has been to determine the influence of soil fertilizations systems (fertilization with: nitrogen, phosphorous, nitrogen and phosphorous, farmyard manure) on the chemical properties (pH, humus, aluminium and phosphorous content) of the soil. The experiments have been carried out in the experimental field of National Agricultural Research and Development Institute � Fundulea, Romania, for: wheat monoculture, 2-year crop rotation (wheat-corn), 3-year crop rotation (wheat-pea-corn), and 4-year crop rotation wheat-sun-flower-pea-corn. The lowest values of the phosphorous content in soil have been recorded for 3-year experimental variant (wheat-pea-corn), unfertilized (a3b1), and the lowest aluminium content in soil 596 mg/kg d.m.) has been recorded for the a4b5 experimental variant (4-year crop rotation wheat-sunflower-pea-corn) � fertilized with N90P75 kg/ha a.m., working depth: 15-30 cm.

Mathematical Modeling for the Accumulation of Cadmium, Zinc and Arsenic from the Soil in the Case of Bulrush Plant Type

“…For a long time the soil haS the capacity of natural self-cleaning in the environment. [2,5,[8][9][10][11][12][13][14][15][16][17][18][19].…”

Influence of Bacau City�s Antropic Activities on the Heavy Metals Concentration Measured on Bistrita and Siret River Sides

“…The pollution of the environment with heavy metals through human activities has caused their accumulation in surface waters, sediments and soil, especially in industrial areas [2,5,8,[12][13][14][15][16][17][18][19].…”

Influence of Soil Fertilization Systems on Chemical Properties of the Soil

“…).Chlorine have the highest content in soil (31.02 mg/100 g soil, 15-30 cm working depth, parcel fertilized with azote 90 kg N/ha) in comparation with the other chemical properties of the soil (content of magnesium, aluminium, potassium, calcium and iron).A fertilizer can be a natural or synthetic product, of a mineral and/or organic nature, simple or complex, which is applied in liquid, semi-fluid or solid form to the soil, to the surface, or foliar for the purpose of increasing soil fertility and ensuring development and normal plant growth [1][2][3][4][5][6][7][8][9][10][11].Mineral fertilizers with nitrogen have a high solubility and have the quality of being able to provide almost all the necessary nutrients to the plants in a form that allows their direct and easy absorption. Another important advantage of mineral chemical fertilizers is that they allow their association and application with organic or green fertilizers [12][13][14][15][16][17][18][19][20][21][22].Mineral fertilizers with phosphorus have much lower solubility (10-20% in the first year of application in the case of phosphorus and 30-40% for potassium), accumulating in the colloidal mineral formations of the soil, then being blocked in the form of heavy phosphates soluble in calcium, magnesium, iron and aluminium [12,16,19,21,[23][24][25][26][27][28][29].Animal production is developed in individual farms and in large livestock farms. An important consequence is the accumulation in large quantities of the residual organic materials of solid, liquid and semi-liquid consistency.…”

“…An important consequence is the accumulation in large quantities of the residual organic materials of solid, liquid and semi-liquid consistency. Normally these residues, with the value of organic fertilizers, are used to fertilize agricultural land [12,16,[28][29][30][31][32][33][34][35][36][37][38].The purpose of this research has been to determine the in2fluence of soil fertilizations systems on the chemical properties (magnesium, aluminium, potassium, calcium, iron and chlorine).…”