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Information × Registration Number 0224U000010, 0121U000051 , R & D reports Title 02.02.02.07.P Theoretically substantiate crop rotations with a high level of competitiveness to segetal vegetation popup.stage_title Head Kravchenko Vitalii P., Registration Date 01-01-2024 Organization Cherkasy State The Agricultural Experimental Station of National Scientific Center "Institute of Agriculture of National Academy of Agrarian Sciences of Ukraine" popup.description2  According to Braun Blanche, the segetal vegetation of our agrophytocenoses belongs to the class Stellarietea mediae Centauretalia cyani R. Tx. 1950, order Secalietalia Br.-Bl. 1931 em J. et R.Tx. 1960 D.s. Ord. = D.s. C. In agrocenoses of crop rotation, the weed population is represented by several types of spring weeds: gray mouse (Setaria glauca L.): gray mouse (Setaria glauca L.) - 38.1–61.2%; white quinoa (Chenopodium album L.) – 20.1–56.5%, bitter gourd (Polygonum scabrum Moench.) – 11.4–18%, nightshade black (Solanum nigrum L.). 8.5 – 26.2%, buckwheat (Polygonum convolvulus L.) – 2%. The average weediness of three-field crop rotations was 81.7–79.3 pcs./m2, and five-field crop rotations – 174.8–179.8 pcs./m2. In the composition of weeds, the share of monocotyledonous weeds, in particular, 37.5–46.5%, is the gray mouse. Of the dicotyledonous weeds, white quinoa dominated 15.8–31.4%, black sorrel – 5.5–26.2%, bitter gorse – 9.2–23.2%, buckwheat – 1.1–7, 3%. With long-term use of tillage, the number of weed seedlings in spring crops (peas, barley, corn, sunflower) is 1.4–3.2 times greater than in plowing. Evaluation criteria of the state of fertility of typical low-humus chernozem are the ratio of monocotyledonous and dicotyledonous plants in the coenosis, taking into account their mass; a significant part of mouse blue as an indicator of reduced soil fertility and, conversely; the presence of a significant number of such nitrophils as white quinoa, black nightshade, common sedum as an indicator of high soil fertility with a tendency to actively remove nitrogen from them. The largest losses of nutrients are observed for no-shelf cultivations with the introduction of a double dose of fertilizers, 39–52.4 kg/ha, and the lowest for plowing, 10.8–26.7 kg/ha. The removal of NRK increases by 2.1–1.5 times with increasing soil fertility: 10.8 kg/ha in the control without fertilizers, 23.3 kg/ha in the background of N31Р33К41, 26.7 kg/ha in the background of N62Р66К82. Product Description popup.authors Chala Svitlana V. Yarmilko Svitlana A. popup.nrat_date 2024-01-01 Close