hrvatski

Kretanje nitratnog i amonijačnog dušika pri uvjetima različite gnojidbe i malčiranja tla u proizvodnji rajčice

In this study the results of the field experiment conducted during 2007 on the deep red soil of the area of Valtura about the distribution of nitrate and ammonium nitrogen in soil and filtered water, on the occasion of tomato cultivation on bare soil, respectively on the soil covered by organic (straw) and synthetic (PE film) materials were showed. Fertilization was achieved with 60, 120 and 180 kg N/ha. The average concentrations of nitrate and ammonium nitrogen in the upper layer of soil have varied from 0, 54-13, 96 mg of soil, respectively from 0, 34-2, 84 mg of soil and mainly they have been more on the bare than on the soil covered with straw and PE - film. The concentrations of nitrate nitrogen in filtered water have varied in a wide range from 17, 5 - 319, 2 mg, depending on the quantity of filtered water, level of fertilization and consumption of nitrate from tomatoes, while the concentrations of ammonium nitrogen have varied in a narrow range from 0, 3-12, 4 mg. As a rule, the highest fertilized variables have also noted down the highest concentration of nitrate and ammonium nitrogen on soil and waters. In filtered waters the increased concentration of nitrate and ammonium nitrogen often exceeds the maximum degree of permitted concentration for potable water (According to Croatian rules). For this reason it is necessary to use rationally nitrogen fertilizers on the agricultural areas of this region, in order to protect its soil, and especially its water, as it is a question of delicate Karst landscape, whose subterranean waters are used as drinking water.

rajčica; gnojidba; nitrati; amonijak

nije evidentirano

engleski

Nitrate and Ammonium Leaching in Open Field Tomato Cultivation under Different N Rates and Mulch Managements

In this study the results of the field experiment conducted during 2007 on the deep red soil of the area of Valtura about the distribution of nitrate and ammonium nitrogen in soil and filtered water, on the occasion of tomato cultivation on bare soil, respectively on the soil covered by organic (straw) and synthetic (PE film) materials were showed. Fertilization was achieved with 60, 120 and 180 kg N/ha. The average concentrations of nitrate and ammonium nitrogen in the upper layer of soil have varied from 0, 54-13, 96 mg of soil, respectively from 0, 34-2, 84 mg of soil and mainly they have been more on the bare than on the soil covered with straw and PE - film. The concentrations of nitrate nitrogen in filtered water have varied in a wide range from 17, 5 - 319, 2 mg, depending on the quantity of filtered water, level of fertilization and consumption of nitrate from tomatoes, while the concentrations of ammonium nitrogen have varied in a narrow range from 0, 3-12, 4 mg. As a rule, the highest fertilized variables have also noted down the highest concentration of nitrate and ammonium nitrogen on soil and waters. In filtered waters the increased concentration of nitrate and ammonium nitrogen often exceeds the maximum degree of permitted concentration for potable water (According to Croatian rules). For this reason it is necessary to use rationally nitrogen fertilizers on the agricultural areas of this region, in order to protect its soil, and especially its water, as it is a question of delicate Karst landscape, whose subterranean waters are used as drinking water.

tomato; fertilizers; nitrate; ammonium

nije evidentirano