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WATER INFILTRATION AFTER DRIP IRRIGATION IN THE SLIGHT ERODED CHERNOZEMS FROM SLOPE LAND OF SMALL RIVER BASIN REDIU, ROLLING HILL JIJIA-BAHLUI (ROMANIA)

O. Radu, M. Ailenei (Radu), F. Filipov
Thursday 11 October 2018 by Libadmin2018

ABSTRACT

In the small catchment area of RediuValley has initiated some investigation concern to the possibility of practice drip irrigation for horticultural plants. It is well known that soil from slope lands have high susceptibility to erosion processes. Plants grown on slope land are also predisposed to longer droughts as a result of the partial infiltration of water from snow melting and after high intensity precipitation. The studied Rediu water basin has a length of 8 km and a surface area of the 11 km2. Surface under study is located on the left side of the River Rediu with slopes ranging from 10-25%. The area of Rediu Valley is at the interference of the north-western air masses with the eastern ones, in a temperate continental climate with an average annual temperature of 9.4°C, and annual averages precipitation of 529 mm and uneven distribution over growing season. The land surveys for applying drip irrigation were carried out at a grape vine school, located on a sloping land (cca. 15%), cultivated in ridges covered with a black film. The ridges were oriented along the level curves. The distance between rows is 1.10 m. The soil was diagnosed as slight to moderately eroded haplic Chernozems with evident stagnic properties on the middle part of soil profile. The presence of the reduction mottles is a result of lateral water movement in the soil layer with fine texture. The drip irrigation allows the precise dosing of water content needed in various period of plant growing, a stringent requirement of grape vine schools. Among the conclusions drawn from the study we mention: irrigation by dripping is recommended on the slope lands due to the precise dosing of water content needed in various growing period (i); for a better roots development of cuttings it is required watering at smaller periods between drip irrigations and smaller doses but after root system development the watering is recommended at a higher periods and doses (ii); the maximum water content was recorded soon after watering on ridge, at 6 hours from watering application on the bottom part of ridge and after 72 hours at the middle distance between plants rows (iii); the rows plants along the contour lines and drip irrigation improves the water regime and diminishes soil losses by erosion processes (iv).

Keywords: slope land, dripping, water infiltration


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