INFESTATION OF SOYBEAN SOWING UNDER VARIOUS CULTIVATION CONDITIONS
2016
Parakhin, N.V. | Lysenko, N.N. | Kuzmicheva, Yu.V.
The data on species composition, population dynamics, the mass of weeds in agrocenoses of northern ecotype soybean varieties (Svapa, Barа, Tanais, Oressa) under different conditions of cultivation (plowing and surface treatment, application of lime and its absence) are present. Maximum clogging was observed in the early growth phases. During the growing season the number of weeds decreased by an average of 24,5 %, but remained still high and required special weed control procedures. The disking increased contamination with weeds and the wet weight of weeds. Weeds developed better in the absence of lime, than after liming. In the context of contamination the most productive variety was Tanais: when plowing – 1,91 t/ha, with stubble – 1,62 t/ha, with the combined application of harrowing and lime – 1,59 t/ha. Yield of this cultivar was lower than in variety Oressa 0,3 t/ha after the combined application of plowing and lime. For cultivars Barа and Oressa the combined effect of technology factors disking + lime was more effective than their separate effects. The protein content in grain of cultivars Svapa, Tanais and Bara when plowing was higher than in the stubble. The use of lime after plowing and disking decreased protein content of all cultivars. The fat content in grain of cultivars Svapa and Bara increased with stubble, and in grain of cultivars Oressa and Tanais it increased after plowing. Liming contributed to the increase of fat content in grain of the studied varieties.
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