RESEARCH ON THE LEAF AREA THROUGH THE PRISM OF HYBRID X DENSITIES X MOMENT OF DETERMINATION INTERACTION TO AN ASSORTMENT OF THE SUNFLOWER TESTED ON THE CHERNOZEM FROM CARACAL

DOBRE ȘERBAN CĂTĂLIN

Abstract


At ARDS Caracal, on chernozem type soil, for two years (2018 and 2019), 9 sunflower hybrids were tested to study the interaction between hybrid, sowing density and moment of leaf area determination. The hybrids were: Euromis, Generalis, Terramis, Neoma, Diamantis, Subaro, Performer, FD15C27, FD116M1. The densities of which hybrids were: 43000 pl / ha, 57000 pl / ha and 71000 pl / ha and the moment of determining the leaf area was placed 32 days, 43 days, 54 days and 66 days after emergence. The leaf area was determined on all the leaves on the plant, on 3 plants on each replication, using Schneiter's (1978) formula: S = (L * l * 0.6683) -2.45 where S = leaf area, L = length of the leaf, l = width of the leaf. Compared to the first determination, in the other three, the leaf area showed very significant increases in all densities and all hybrids. At medium and high densities, only Neoma and FD15C27 hybrids had fast leaf surface growths. The leaf area was lush at low density in Neoma and FD116M1 hybrids while Euromis and Performer hybrids showed the same leaf area in both densities: low and medium.


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