RESEARCHES CONCERNING THE INFLUENCE OF SOME SULFUR FERTILIZERS UPON SOME PHYSIOLOGICAL INDEX, CROP QUALITY AND QUANTITY OF MAIZE PUBLISHEDD. CAMEN, R. ŞUMĂLAN, Laura SUCIU, Ioana POPESCU, Brigitta SCHMIDT, S. GASPAR, M. HORABLAGA, F. VILIGA, Carmen BEINŞAN, Mariana BABAU, J. C. YVIN, Giancarla VELICEVICI, Renata ŞUMĂLAN
The goal of this experiment was to tested the influence of some sulfur based fertilizers on some physiologica index, production and quality characteristics in maize. Sulfur is involved in protein synthesis in chloroplasts, sulfur amino acids, photosynthesis and glutathione products having a role in redox reactions. Sulfur catalyzes chlorophyll biosynthesis. In the absence of sulfur, leaves are chlorotic with pale veins. A sunflower hybrid was used (KWS 2376 - FAO 370) and two fertilizing variants were applied: : N-P-K (20-20-0) – 228 kg fertilizer/ha- brutto - 45,6 kgN/ha active compound, V1 N-P-K – MgO – Na – SO3 (23-0-5-5-1 + 22) – 198,4 kg fertilizer/ha-brutto- 45,6 kgN/ha active compound. The second application of fertilization was realized in phenophase BBCH 4.7 (vegetative stage), to complete the nitrogen application to 130 kg of active substance per hectare, with 283 kg/ha NH 4 NO 3 at control plots and 246 kg/ha NH 4 NO 3 in V 1 variant plots.The experiment was located the Experimental Teaching Resort at USAMVB Timisoara on a total surface of 2016 m2 , in plots of 504 m2 and having 4 repetitions (GPS coordinates Lat/Long: 45,782; 21,211 Timisoara, Romania). Measurements of plant physiological features were realized in three different development stages: Stage of 7-10 leaves (vegetative stage), BBCH 4.7; Flowering stage, BBCH 6.5;Ripening, dough stage, BBCH 8.5.In these stages we measured the total leaf area of plants (cm 2 /pl.), the dry matter and chlorophyll content of leaves. Also the quantity and quality (starch, protein, lipid and humidity content - OMEG ANALYZER G BRUINS INSTRUMENTS) of crop was assessed. Regarding the quality of maize kernels, we assessed the following characters: water, protein, starch and lipid content. Results show that there are no statistically significant differences between the experimental variants. The experiment has shown that the variant fertilized with sulfur has obtained a significant production increment in comparison to the witness variant.
maize, sulf fertilizer, crop quantity, crop quality