Formation of Summer Rape Productivity by Applying Biological Growth Regulators

Abstract

Field tests were carried out at the Research Station of LUA during the period of 2005-2007, where the dominating soil type is carbonate shallow gleyic leached soil (IDg8-k). For the summer rape of 'SW Landmark' cultivar, additional foliar fertilizing with Humistar, Atgaiva-P and P energetic-p lapams solutions was applied. The effect of additional fertilizing on the formation of the summer rape harvest structural elements, seed fertility and changes of qualitative indicators were defined. Upon additional foliar fertilizing of the summer rape with liquid fertilizer and bioactivator solutions, the plants produced more side shoots and by 1.1-1.4 more seeds in siliques; the weight of 1000 seeds increased by 0.22-0.34 g in comparison with the plants that were not fertilized additionally. Upon additional fertilization with Penergetic-p lapams and Atgaiva-P solutions, seed fertility increased significantly by 0.34-0.50 t ha -1 or by 14.5-21.3 per cent compared to the seed fertility of the rape not fertilized additionally. Laboratory analysis demonstrated that under the influence of additional fertilization the fat content in rape seeds had increased by 0.49-0.65 percent, protein content decreased by 0.25-0.77 per cent, erucic acid content decreased by 0.08-0.20 per cent, glucosilonate content in mill cake increased by 0.44-0.87 umol g' compared to the qualitative indicators of the rape seeds of the plants grown under the influence of just background fertilizing.