Scientific Journal of KubSAU

The article presents the results of diagnosis of soybean plants with sulfur, molybdenum and boron in a Western Ciscaucasia on leached chernozem (black soil). The soil testing has shown that the availability of sulfur in the experimental plots is low (2,10-7,02 mg / kg), molybdenum - average (0,20-0,28 mg / kg), boron - low to high (0, 22-0,63 mg / kg). The sulfur content was optimal in 2013 (2309 mg / kg), molybdenum - 2013 and 2014 (1.11 and 0.94 mg / kg) and the boron content was high (65,2-94, 1 mg / kg) in soybean plants. The soybean plants needed sulfur fertilizer in 2012 and 2014, molybdenum - in 2014, and boron fertilizers are not needed, according to the functional diagnosis. The results of various methods of diagnosis coincided with the response of soybean plants for foliar application: sulfur fertilizer increases the yield in 2012 and 2014 by 7.1 and 8.9 %, molybdenum also in 2012 and 2014 - by 6.0 and 10.0 %. Boron fertilizers in 2014 increased soybean yields (17.1%), despite the lack of need for soybean plants in Bor. So, the method of functional diagnostics is more accurate than chemical soil and plant diagnostics

In the article, we have revealed the efficiency of foliar sulfur (potassium sulfate 250, 500, 1000 and 2000 g/ha), molybdenum (celik molybdenum 125, 250, 500 and 1000 ml/ha) and boron (solubor DF 0,5, 1,0, 2,0 and 4,0 kg/ha) fertilizers in various doses of soybean growing on the leached black soil of Northern Ciscaucasia which are based on studies in central part of the Krasnodar region in 2012-2014. The Vilan is a soybean variety most common in the Krasnodar region; therefore it was taken as the research object. It was established that 250 g/ha is the most effective dose of sulphur fertilizer. It’s provided a yield increase by 0,13 t/ha and increase collection of protein and oil (52,9 and 21.1 kg/ha, respectively). Soybean yields were increased by the application of molybdenum fertilizer in a dose of 250 ml/ha by 0,10 t/ha with increasing collection of protein 45,8 kg/ha. Boron fertilizer increased sum of beans and seeds. Variant of 0.5 kg/ha provided yield increase of 0.08 t/ha, but it was 0.26 t/ha in dry 2014