Critical period of weed control in radish (<i>Raphinus sativus</i> L.)

Assessment of peculiarities of weed formation in oilseed radish agrophytocoenosis using different technological models

“…The weed type of the oilseed radish agrocoenosis oscillated from dicotyledonous-cereal-non-perennial in the germinaterosette interphase to the root-germinating-rhizome-non-perennial in the green-yellow ripeness interphase of the pods (BBCH 70-84). According to the kind of agrocoenosis of weed type formation and the magnitude of the frequency index, individual species can be differentiated, and this concurs with the results of individual studies (Afifi and Swanton, 2012;Harris et al, 2015;Zimdahl, 2018). Limited oilseed radish in a system of intensive planting density in a stand can be attributed to crops with high competitive potential compared with the main weed species.…”

“…Assessment results of weed vegetation dynamics indicated a steady increase in coenotic tension due to the gradual transition of dominant weed species such as C. album, A. retroflexus, E. crus-galli, E. repens, S. arvensis, C. arvense, and C. arvensis in the middle and upper sowing stages when increasing the determination frequency by 1.1 to 1.3 times. The problem with the significant dominance of individual weeds, including the multi-year cycle of development, is common in aspects of effective weed control in all cross-flowering crops (Harris et al, 2015).…”

“…A common tactic for weed control and a number of control measures have been developed over a fairly long period of scientific research, which are based on establishing a crop-specific critical period for weed control (CPWC) (Knezevic and Datta, 2015;Swanton et al, 2015;Andrew et al, 2015;Santosh et al, 2018;Merino et al, 2019). This indicator has now been identified and analyzed for many crops (Tursun et al, 2016;Vaishali et al, 2018), including relatives (Brassicaceae) of oilseed radish crops such as radish, spring rapeseed, winter rapeseed, and mustard (Lemerle et al, 2010;Harris et al, 2015). The indicated conceptually methodological approach allows us to specifically exclude those periods in which the crop is the least competitive in relation to weeds from the general growth and development stages of the crop.…”