Features of photo­synthetic activity of sowings of corn for grain in conditions of pollution with lead, cadmium, and zinc

Abstract

The purpose. To study features of formation of the assimilatory apparatus of plants of corn for grain with growing the crop on edaphic backgrounds, polluted with lead, cadmium, and zinc. Methods. Probes were carried out in long small-plot experiment in 1999 in pilot farm “Chabany” NSC «Institute of agriculture of NAAS». The area of leaf surface, photosynthetic potential of sowing (PPS), amount of dry matter, net productivity of photosynthesis (NPP), parameters of fluorescence of chlorophyll pigment were determined in master phases of propagation and growth of plants of corn. Results. It is proved that at accumulation of heavy metals in upper 0 – 20 cm layer of grey forest soil processes of formation of the assimilatory apparatus of plants of corn were infringed. PPS had decreased for 7,5 – 34,2%, NPP — for 3,22 – 22,6%. Calvin’s efficiency, determine on parameters of Kautsky curved line, had correlative dependence with PPS of sowing r=0,588 – 0,923 and with NPP — r=0,581 – 0,914. Productivity of mealies had decreased for 6 – 22% in comparison with the supervisory control. Conclusions. The close positive correlation between quality and quantity indicators of state of the assimilatory apparatus of plants of corn and productivity of crop (r=0,978 – 0,995.) is revealed.