SVIBOR - Project code: 4-99-046

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

SVIBOR

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Project code: 4-99-046


REGULATION OF SOIL WATER REGIME FOR INTENSIVE PLANT PRODUCTION


Main researcher: TOMIĆ, FRANJO (50020)


Assistants
Type of research: applied
Duration from: 03/01/91. to 12/31/96.
Papers on project (total): 103
Papers on project quoted in Current Contents: 8
Institution name: Agronomski fakultet, Zagreb (178)
Department/Institute: Department of amelioration
Address: Svetošimunska 25, 41000 Zagreb
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (01)2335-077 i 2335-777
Fax: 385 (01)215-300
E-mail:
Summary: Most agricultural areas in Croatia require regulation of excesswater by drainage systems in the autumn-winter -spring period. Insummer months, however, water deficiency has to be corrected byirrigation. Experimental fields for investigations of detaileddrainage elements have been set up on hydromorphic soils in theSava and Drava river valleys while irrigation elements arestudied in the Drava valley. Investigation results for the1991-1995period can be summed up as follows: The firstappearance of groundwater and its stagnation within the 1 m depththroughout the year varied in the 17 drainage variants set up onthe experimental field Jelenščak at Kutina. Differences were alsorecorded in the soil moisture to a depth of 30 cm. The moistureinterval, however, was always between the field water capacityand wilting point. Drainage discharge depended on the amount anddistribution of precipitation, as well as on the crop grown, andamounted to 15-30% of total precipitation. The drainage watercontent of nitrate and ammonium forms of nitrogen was alwaysbelow tolerance, so these drainage systems and the mineralfertilization applied present no contamination hazards fordrainage water. Soil type (its stratigraphy) and agrotehnicalmeasures applied are of considerable importance for a properperformance of the drainage system. The soil type also determineswhether and what kind of filters are required for drain trenches.

Keywords: Drainage system, system performance, groundwater, soil moisture,drainage discharge, nitrogen content, system performance, waterregime, pipe drainage, drain trench backfilling, filtermaterial, irrigation, crop yield.

Research goals: The investigation have several objectives. The main objective ofexperimental fields in the Sava valley is to determine the mostefficient detailed drainage measures and the need forsupplementary agroameliorative practices aimed at excess waterregulation on heavy soils. Along with regulation of excess water,environmental protection should be considered, so as to preservethe favourable properties of the soil and waters. The mostefficient variant seems to be detailed drainage with narrow pipespacing, combined with supplementary measures and filtermaterial. However, this variant may not be most reasonable andfavourable from the ecological point of view. Another importantgoal of the investigations is to assess the efficiency of thedrainage systems constructed, particularly in view of the lowefficiency of the previously constructed drainage systems. In isexpected that a number of the existing drainage systems in theSava valley will have to be revitalized and some evenreconstructed. A further goal is to define the best variant fordrain trench backfilling (filter material) on hydromorphic soils.After winter and early spring crops have been harvested,agricultural areas are left empty in the largest part ofcontinental Croatia. Hence, it is important to know the role ofirrigation for a rational utilization of agroecologicalpotentials of the North-West Croatia effected by second orsubsequent planting of crops, as well as the effect of irrigationon the vegetative and generative development stages of testcrops. The results will have a direct application in agriculturalpractice.

COOPERATION - PROJECTS


  1. Name of project: 2-11-059 Znanstvene osnove za razvoj navodnjavanja u Hrvatskoj
    Name of institution: Građevinski fakultet Sveučilišta u Rijeci
    City: 51000 - Rijeka, Croatia

  2. Name of project: 2-11-080 Optimalizacija hidromelioracijskih sustava za odvodnju
    Name of institution: Građevinski fakultet Sveučilišta u Zagrebu
    City: 10000 - Zagreb, Croatia

  3. Name of project: 4-01-037 Evaluacija novih vrsta, sorti i tehnologija u uzgoju povrća
    Name of institution: Agronomski fakultet Zavod za povrćarstvo
    City: 10000 - Zagreb, Croatia

COOPERATION - INSTITUTIONS


  1. Name of institution: Javno vodoprivredno poduzeće "Hrvatska vodoprivreda"
    Type of institution: Institution whose primary activities ar
    City: 10000 - Zagreb, Croatia
Other information about the project.
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