Plant and Soil Science

Formaton of soybean sowings with the most developed leaf apparatus, which would bein the actve state for a long tme (maximal) both at the beginning and at the end of the growing seasonis an important prerequisite for high productvity of the crop. Aim of the study was to detect the effectsof inoculaton by preparaton Legum Fix and foliar feeding by chelate microfertlizers Vuxal Oil Seed andQuantum-Oliyni on dynamics of leaf surface area and formaton of photosynthetc potental of soybean varietes. Field studies were carried out on the basis of statonary rotaton of the ALLC «Vasyuta» inthe Kovel district of Volyn region. Field studies were carried out on soybean sowings varietes Cassidy(Canada) and EC Mentor (France). As result of conducted researches is established that the maximumsizes of the leaf surface of soybean crops was reached during the flowering period and at the beginningof beans formaton, it decreased slightly in the phase of seed swelling, which, first of all, was causedby plants water availability, as lack of moisture led to suspension of plants growing processes and toweaken their photosynthetc actvity. A larger area of leaf surface was formed by the early ripeningvariety EC Mentor, which, depending on variant of the experiment and period of plant growth, varied inthe range of 21,5–45,7 thousand m2/ha. Fertlizing of soybean sowings by chelate microfertlizer VuxalOil Seed at the beginning and in full flowering (BBCH 60-66) with rate of consumpton 2,0 l/ha and seedinoculaton by Legum Fix in the day of sowing with dose 2,5 kg of preparaton per 1,0 t of seeds contributedto formaton of maximum assimilaton surface of soybean sowings – 44,7 and 45,7 thousand m2/ha in varietes Cassidy and EC Mentor, respectvely. Was noted, that during period of soybean varietesvegetaton, the photosynthetc potental gradually increased and reached maximum values from theend of flowering phase to full swelling of seeds, further gradually decreasing from the phase of physiologicalmaturity of seeds. Maximum photosynthetc potental of sowings - 2,450 and 2,445 million m2/ha, early ripening varietes EC Mentor and Cassidy were formed during period of flowering – full seedswelling with use of seed inoculaton and fertlizing of sowings by chelate microfertlizer Vuxal.Key words: Glycine hispida Maxim., variety, inoculaton, nutriton, chelate microfertlizers,leaf surface area, photosynthetc potental.

Glycine hispida Maxim., variety, inoculaton, nutriton, chelate microfertlizers,leaf surface area, photosynthetc potental