The development of downy mildew of onion at some fertilizer and fungicide treatments
1999
Wahab, R. | Nasrun, D. (Balai Pengkajian Teknologi Pertanian, Sukarami (Indonesia))
The downy mildew is one of the most important diseases in reducing onion yield, especially on rainy or wet season. In the integrated pest management, a disease can be controlled through some technical methods such as fertilizer management and fungicide application is the last alternative. The experiment was carried out at Sukarami experimental station of Sukarami Assessment Institute for Agricultural Technology about 950 m asl on rainy season (November 1999 to January 2000). The treatments were arranged in a Split Plot Design and replicated three times. In the experiment tested four fertilizer treatments (A = 150 kg Urea, 450 kg ZA, 200 kg SP36, 200 kg KCl per ha; B = A+SS; C = A+NPK; D = A+SS+NPK) as the main plot and fungicide application (A = Sistemic, B = Contact; C = a and b intermitten) and without fungicide application were as the sub plot. The data collected were downy mildew infection (3-7 weeks after planting), tuber number, and yield. The result showed that fertilizer treatment C (Urea, ZA, SP36, KCl) + NPK (15,15,15)) was the most effective to control downy mildew and gave the highest yield, while systemic and contact fungicide intermitten application showed the lowest infection of downy mildew and gave the highest yield
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