Changes in the content of inorganic nitrogen in soil during the growing season in winter wheat
2002
Ondrisik, P. | Cerny, I. (Slovak Agricultural Univ., Nitra (Slovak Republic))
In 1998-2000, a stationary field experiment was conducted to study the influence of fertilization, using the balance method based on inorganic N content of soil and nutrient requirements of winter wheat, on the soil inorganic nitrogen. The weather conditions associated with agro-technical interventions had the most significant influence on the content of inorganic N in soil. Changes in weather conditions during growing season were more important than fluctuations of rainfall and temperatures between the experimental years. Ammonium nitrogen predominated in the soil in consequence of insufficient soil moisture. On average the highest values of ammonium nitrogen were found after harvest (9.07 mg/kg), which makes an increase of 6.15 mg/kg, compared to the sampling before seeding. The content of nitrate nitrogen was markedly lower and the average highest content in the soil of N-NO3- was before seeding (3.55 mg/kg). The different fertilization method had no important influence on a change of the content of inorganic forms of nitrogen in soil
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