Control of soil weediness and sugar beets by after crop green manure and different tillages

Abstract

The research program envisaged the studying of the variation of weediness of sugar beet crops under the influence of after crop sideration and the application of soil protection cultivation. The application of oil radish green manure provided a significant decrease in the amount of seed weeds in the entire 0-30cm layer of soil in comparison with the non-seeded background on 2.8-3.4 mln. seeds ha-1 and a significant decrease in the weed density of all biological groups weeds on 0.5-6.5 weeds m-2 and their weight on 5.6-77.4g m-2 for the period of growing sugar beets. Comparing to plowing the methods of mouldboard-free cultivation provided a significant increase in the quantity of weed seeds in the layer of soil 0-10cm to 18.3-22.9×106 seeds ha-1 and their significant decrease deeper than 10cm on 19.0-23.3 mln. seeds ha-1. Among the variants of mouldboard-free cultivation the lowest amount of weed seeds in the soil layer of 0-5cm was discounted at the deepest cultivation – 24.5 and 23.5×106 seeds ha-1. The decrease of the depth of the mouldboard-free cultivation led to a significant increase in the weed density (by 4.8-68.2 weeds m-2) and their weight (82.5-1193.5g m-2) in sugar beet crops and a substantial shortfall in yields of root crops – 2.9-5.8t ha-1. It follows from the research results that the application of after crop siderate of radish oil and basic mouldboard-free cultivation reduce the potential amount of weed seeds of root layer 0-30 сm; the deep soil cultivation on 28-30cm at the siderate background provides the greatest decrease in real weediness of sugar beet crops and allows to receive high yields of crops – 34.3 t ha-1.