Augalų augimo reguliatoriaus Modus mišinių įtaka žieminių kviečių derliui ir jo struktūros elementams / | The influence of modus mixtures with other plant growth regulators on the grain yield and productivity of winter wheat.
2005
Auškalnienė, Ona,
Plant growth regulators (PGR) are used in an intensive farming system to control lodging in cereals. To estimate the efficacy of plant growth regulators field trials were conducted at the Lithuanian Institute of Agriculture’s Department of Soil and Plant Management during 2002-2003. The soil of the experimental site is drained sod gleyic, light loam. The winter wheat cv. ‘Širvinta’ stands were sprayed with the gibberellin biosynthesis inhibitors CCC (chlormequat chloride CCC), Modus (trinexapac - ethyl) or with ethylene releasing Terpal C three times – at BBCH 29-30; BBCH 32-33 and BBCH 37-39 (Terpal C). Plant growth regulators had some effect on the grain yield of winter wheat. In all treated plots a grain yield increase tendency was recorded in all experimental years. Significant increase was obtained in the plots treated twice: for the first time with CCC 1 l ha-1 at BBCH 29-30 and for the second time with modus 0.4 l ha-1 at BBCH 32-33. Similar results were obtained in the winter wheat plots applied with CCC 1 l ha-1 for the first treatment and for the second treatment with CCC and Modus (0.4 + 0.2 l ha-1). Plant growth regulators had some impact on the other parameters of winter wheat: length of ears, grain number per ear, 1000 grain weight. The longest ears of winter wheat were produced in the plots treated for the first time with CCC 1l ha-1 and for the second time with modus 0.4 l ha-1. The longest ears of winter wheat were found to have more grain and a higher grain weight. Coefficients of correlation were 0.811 and 0.769. In all treated plots chlorophyll content in the leaves of winter wheat plants was greater than in untreated. The greatest content of chlorophyll was identified in the plants treated for the first time with CCC 1 l ha-1 and for the second time with modus 0.4 l ha-1.
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