DAYLY DYNAMICS OF TRANSPIRATION INTENSITY OF SOYBEAN VARIETIES LEAVES (GLYCINE MAX. (L.) MERR.) IN CONDITIONS OF CHUI VALLEY

Abstract

The research work reflects some basic indicators of the water regime. Experimental
researches were carried out on five varieties of soybean (Glycine max. (L.) Merr.), cultivated on
gray soil of the Chui Valley (Kenesh village). During several seasons, research has been carried
out to study the water-holding capacity, the intensity of leaf transpiration and the water content
in the leaves of various soybean varieties. We determined the daily dynamics of transpiration
intensity, its minimum and maximum values for domestic and foreign soybean varieties. It was
revealed that the IT of leaves has a one- and two-peak curve, where its maximums were observed
at 3 and 5 o’clock in the afternoon at air t +33-35°C. Based on the water content in the leaves and
the ability to retain water, the indicators of all samples remain in high concentrations for up to
half a day. But with the increase in temperature and its decrease in the evening, a smooth decline
is observed on the graph. Despite the arid climate of the northernmost region of the country,
the conditions of the Chui Valley allow the cultivation of soybean varieties. The results obtained
describe their resistance to atmospheric and soil drought.