PJB-2025-224
RESEARCH RESULT ON WEEDS DISTRIBUTION IN THE CENTRAL CROP PRODUCTION AREA OF MONGOLIA
Amarsaikhan.J
Abstract
In recent years, the climate has been changing rapidly, especially in our country, where air temperature are increasing and more sudden large amount precipitation compared to the average. Considering the climate of Tuv province, which is part of the central agricultural region of Mongolia, the total air temperature is 14°C higher than the average temperature of May to September and the precipitation is lower in May to June, in July-August about 40 mm higher, which affects the spread of weeds in agricultural fields. Which means, encourages the growth of spring-summer annual C4 weeds by sufficient warmth in spiring and moisture supply in July for their reemergence, rather than C3 plants that grow in the harsh and cool climate of our country. Additionally, the excess rainfall in August is affecting crops by delaying harvest maturity.
The distribution and species composition of weeds prevalent in the cultivated areas of Batsumber, Bornuur, Sumber, Jargalant, Tseel, Ugtaaltsaidam, and Erdenesant soums of Tuv aimag revealed that an average of 46 species belongs to 40 genera, 19 families of weeds were distributed in the cultivated areas. Perennials such as Quakgrass (Agropyron repens L), Bindweed (Convolvulus arvense L,) etc., which reproduce by rhizomes, and annual weeds such as Artemisia spp, Chenopodium spp, and Polygonum spp, which are common, have an average weed density of 2-3 points. In the fields planted with potatoes and vegetables, 48 species, 41 genera belong to 21 families were recorded in Batsumber soum, 57 species of 51 genera belongs to 22 family in Bornuur soum, 57 species of 48 genera belongs to 20 family in Jargalant soum, and 37 species of 33 genera belongs to 18 family in Ugtaaltsaidam soum. However, when determining the distribution and species composition of weeds in rapeseed fields in Erdenesant, Sumber, and Jargalant soums of Tuv aimag, 10 family, 15 genera, and 17 species of weeds were recorded.
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