USE OF GROWTH REGULATORS FOR SPRING BARLEY ON LIGHT-BROWN SOILS

Abstract

The article has given the results of experiments with the growth regulators ‘ZSS’, ‘Nikfan’ and ‘Energiya M’ for spring barley variety ‘Strannik’. The field trials have been carried out by the Kalmykiya RI of agriculture on light-brown soils with 330 mm of annual precipitations. The regulators have been tested on the natural soils and the soils fertilized with N30P30 through the seed treatment and non-root fertilizing during the period of stem formation. The increase of the amount of easy available nitrogen and phosphorus has been noted in the soils with the use of regulators at the beginning of germination. At the end of vegetation there was an inverse situation. Dry biomass of vegetating plants contained general nitrogen and phosphorus on 0,01-0,18% and 0,01-0,03% more respectively. The use of regulators resulted in improvement of growth and plant development. Field germination of seeds increased on 2,5-4,7%, the co-efficient of general tillering increased on 0,6-1,3%. Even during the toughening of the soil and atmospheric drought the number of preserved seeds increased from 57,3% to 83,6-85,1%. Early and intensive development of the secondary root system with the use of the growth regulators caused such an effect. The yield increase due to the regulators is more significant during the drought. In 2014 the productivity of the crop increased on 43,8-60,4% under the shortage of precipitations and higher air temperatures, while it was 22,7-29,3% on average during the years of study. The seed treatment with N30P30 promoted the productivity increase on 27,3-34,2% on average. The share of the regulators effect was 7,7-34,4%, where the regulators ‘ZSS’ and ‘Energiya M’ showed the best results.