Naslov
Utjecaj hidromelioracija na režim vlažnosti tla i ispiranje nitrata
(Impact of hydroamelioration on soil moisture regime and nitrate leaching)

Autori
Vidaček, Željko ; Sraka, Mario ; Bensa, Aleksandra

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
17th World Congress of soil Science / Irb, Kheoruenromne - Bangkok : Society of Soil Science of Thailand, 2002, 656-663

Skup
Soil Science: Confronting New Lrealities in the 21st Century

Mjesto i datum
Bangkok, Tajland, 14.08.2002. - 21.08.2002

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
hidromelioracije; agromelioracije; režim vlažnosti tla; ispiranje; nitrati
(hydroamelioration; agro-amelioration; soil water regime; leaching; nitrates)

Sažetak
In the valley of the Drava river, tributary to the Danube in Croatia, several years impact of hydroamelioration &#8211 ; canals and/or pipe drainage on nitrate leaching and changes of soil moisture regime of Gleysols was studied, in the period from 1997 to 2000. The dynamics of available soil water in the non-saturated zone of ploughlayer and sub-ploughlayer was measured by gravimetric or electrometric method, and the ground water level was measured by shallow and deep piezometers. The crops in the trial, with standard agrotechnical measures, were maize, fertilized with 173 kg N/ha, winter wheat fertilized with 199 kg N/ha, winter barley fertilized with 110 kg N/ha, and oil rape fertilized with 128 kg N/ha. The nitrate content in soil was determined by the yellow colour complex by phenoldisulphonic acid (USDA-SCS-NSCS, 1992). Nitrates in water were determined by AOAC method, 1995. The ground water level in drained soil is below 1 m throughout the year, but in the soil hydroameliorated only with canals the depth varies from 0 to 2.0 m, with maximum levels in the winter and early spring season. The changes in available soil water content in the ploughlayer and sub-ploughlayer are mainly the result of annual and seasonal climate and hydrological conditions in the drained and non-drained soil, rather than due to the impact of hydroamelioration measures, because of uncompleted agro-amelioration measures of surface and sub-surface soil. Lower nitrate content was determined in the ploughlayer of drained soil in the range between 0.86 and 2.71 mg NO3-/100 g of soil, and in soil hydroameliorated only with canals nitrate content varied from 0.91 to 2.78 mg NO3-/100 g of soil. The content and dynamics of nitrate in soil depends on the quantity and kind of nitrogen fertilizer applied, and the quantity and distribution of rainfall, and on adsorption by the plants. In ground water of drained soil the nitrate concentrations were between 12.0 and 97.9 mg NO3-/l, and in ground water in soils hydroameliorated by canals only, lower concentrations were detected, between 10.2 and 59.1. mg NO3-/l. As expected, the impact of pipe drainage on the quantity and dynamics of nitrate leaching, as well as on lowering of the high ground water level, is greater.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA