Efficacy of weed control in maize for silage | Nezāļu ierobežošanas paņēmienu efektivitāte kukurūzas sējumos skābbarības ražošanai
2010
Kopmanis, J., Latvia Univ. of Agriculture, Auce, Dobele reg. (Latvia). Training and Research Farm Vecauce | Gaile, Z., Latvia Univ. of Agriculture, Auce, Dobele reg. (Latvia). Training and Research Farm Vecauce
Total maize (Zea mays L.) yield failure can be observed due to competition for N, water and light if weeds are not controlled. The aim of the investigation carried out at the Research and Study farm Vecauce (Latvia) during 2006–2008 was to clarify the efficacy of different weed control ways (mechanical and chemical) in maize. Eleven treatments included check without weed control, mechanical weed control, and treatment of maize plots at the maize development stage of 2–6 leaves with five active substances (dicamba, 2.4-D, nicosulfuron, tritosulfuron, and rimsulfuron) of herbicides (including tank mixtures and split applications). Weeds were counted by determining species before weed control and five weeks after the 1st herbicide spray when also weed fresh mass of every species was determined. Weed control efficacy was calculated as percentage decrease of the number of weeds in the 2nd accounting if compared to accounting before weed control, and as percentage decrease of the weed fresh weight in the 2nd accounting if compared to an untreated plot. The results showed that weed control itself in respect to the used way is an effective tool for yield increase (p is less than 0.05), but efficacy of weed control treatment depends on meteorological conditions in the trial year and on the presence of weed species. If the field has high weed infestation or there are any conditions preventing herbicide influence (for instance, drought), tank mixtures at the highest registered doses have to be used. Split herbicide application did not show any advantage if compared to single treatment.
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