RESEARCH REGARDING THE INFLUENCE OF CROP TECHNOLOGY, WATER SUPPLY AND CULTIVATED GENOTYPE ON CWUE AND IWUE IN MAIZE, IN MOSTISTEA PLAIN PUBLISHEDIonel Jinga, Alina Niţu, Daniel S. Niţu
The aim of the research was to identify some technological links with high importance in maize crop technology under stress conditions, to establish the diminution level in irrigation and watering norms, as well as to find a Romanian hybrid capable to cover the farmer’s requirements. A special element in decision analysis of technological recommendations is represented by the calculating the efficiency of each factor, useful to achieve a real yield gain. Thus, two very important synthetical indices were calculated, which clearly express the ratio between water and yield (CWUE and IWUE).Similar researches were also performed in Mostistea Plain for soybean too, following the same aspects i The researches were performed during 2005-2007, in Mostistea Plain, as tri-way experiment, as follows: A = Crop technology, with graduations: a 1 = N 100 P 60 40.000 pl/ha, a 2 = N 180 P 60 70.000 pl/ha; B = Irrigation regime, with graduations: b 1 = dryland, b 2 = irrigated 50% AMI (active moisture interval), on 0-80 cm, with m=800 m 3 /ha, by overhead irrigation, b 3 = irrigated 50% AMI, on 0-40 cm, with 1 / 2 m=400 m 3 /ha, by overhead irrigation, b 4 = irrigated 50% AMI, on 0-80 cm, with m=400 m 3 /ha, by (drip) irrigation, b 5 = irrigated 50% AMI, on 0-40 cm, with 1 / 2 m=200 m 3 /ha, by (drip) irrigation; C = Cultivated genotype, with graduations: c 1 = F475 M, c 2 = Paltin, c 3 = Campion. Within the technological variants used in maize crop, a “last-generation” irrigation technology was chosen, no utilized in Romania till now, namely sprinkling (drip) irrigation.Based on the researches performed under different irrigated areas of Romania, one can ascertain that there is the possibility to diminish the irrigation norm in maize, with 15-30%. No similar researches were performed in other areas of the country. The results achieved establish the level of water supply, as well as the most efficient irrigation method for maize, based on principle “ to obtain more with much less”. The paper presents high originality degrees, no similar papers were performed till now, in Mostistea Plain. Having in view the high cost of irrigation water, the diminution of irrigation norm, by utilizing the most performance methods, has direct involvements on economical indicators (production cost, benefit).
limited water supplying; watering rate; genotype; irrigation norm