PRODUCTIVITY OF MAIZE HYBRIDS OF DOMESTIC AND FOREIGN SELECTION DEPENDING ON THE APPLICATION OF FERTILIZERS, HERBICIDES, BIOPREPARATIONS AND NEW NANO FERTILIZERS
This article deals with the impact of herbicides, fertilizers, biological preparations and organic nano fertilizers on growth, development, yielding capacity and quality of corn hybrids grain of domestic and foreign selection. Maize hybrids from American selection of different maturity groups (PR39G12 - early-maturing, Dracila - mid-ripening and Florence - middle-late) were cultivated in experiments on leached chernozem soils of forest-steppe zone in North Ossetia but hybrid of domestic selection of All-Russian Research Institute of Classification and Standardization - middle-late (Beshtau-490), and of the American selection - middle-late (PR-38-A24) were cultivated in the steppe zone of the Chechen Republic on irrigated meadow-chernozem lands. To increase harvest and grain quality of cultivated maize hybrids in the forest-steppe zone were applied herbicides Harness - up to sprouts and the tank mixture (Titus + Luvaram) - in the phase 3-5 leaves. Fertilizers dose was (N <sub>55</sub>P <sub>100</sub>K <sub>60</sub>) - before pre-sowing cultivation and N <sub>35 </sub>in the phase of 5-7 leaves. Such biological preparations as tank mixture (Extrasol+Humimax+CMU) were applied for crops spraying in phase of sprouts and panicles outthrow. The article provides for the research materials on use in the steppe zone of the Chechen Republic on the 3-4th day after sowing soil herbicides, consisting of the tank mixture Merlin (0.08 kg/ha) and Trophy (1.25 kg/ha) and in a phase 3-5 maize leaves spraying crops with herbicide Dicambel (0.40 g/ha) + nano fertilizers - Bioplant Flora or NAGRO with additional Bioorganic fertilizers top dressing in the phase of 8-10 leaves. The analysis of the chemical grain composition of cultivated maize hybrids on the content of crude protein, fat, crude ash and starch depending on the studied factors is given.