الفهرس | Only 14 pages are availabe for public view |
Abstract Two field trials were conducted in Sakha Research Station in two successive seasons of 1991/92 and 1992/93 to find out the effect of weed control treatments on weed control and growth criteria, yield, yield components and juice quality of sugar beet (Beta vulgaris L.). The important results could be summarized as follow: 1- Comparing with unweeded treatment, Pyradur, metamitron and chloridazon herbicidal treatments decreased number of sugar beet total weeds after I 0 weeks by 30.7, 20.4 and 12_9% and after 18 weeks by 30.9, 27.8 and 13.4 %, respectively. Such poorly weed control levels of single herbicides proved the necessary needed for effective weed control programs in beet field. 2- The additional of one or two hoeings improved drastically the efficiency of all the applied herbicidal treatments. 3- Mechanical weed control of beet weeds with four hand weedings or hoeings existed the highest reduction in numbers of broad-leaved, grassy and total weeds. Previous mechanical weed control treatments decreased number of total beet weeds after 10 weeks by 96.2 and 96.9% and after 18 weeks by 90.7 and 92.8 %, respectively than the control. 4- No detectable differences in fresh weight of broad-leaved weeds, grasses and total weeds were obtained after I 0 weeks from sowing between herbicide + one hoeing; herbicide + two hoeings and mechanical weed control treatments. 5- Integrated weed control treatments exerted a drastic increase in root yield of sugar beet. The highest value for root yield in this investigation was recorded from conventional four hoeings treatment. 6- Hand hoeing 4-time treatment was the highest sugar yielder followed with herbicide + 2 hoeings and handweedings treatments and in third order with herbicide + one hoeing treatments, whereas single herbicides were the lowest. 7- The economic benefits for integration weed control programs in sugar beet were increased as the number of hoeings increased. Additional two hoeings raised the net incomes of the pre-mentioned herbicidal treatments (chloridazon, Pyradur and metamitron) to be 772, 840 and 848 L.E/fed., respectively. |