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National Agricultural Research Centre (NARC), Islamabad  established in 1984, is the largest research centre of the Pakistan Agricultural Research Council (PARC). NARC, with a total land area of approximately 1400 acres, is located near Rawal Lake, six kilometers south-east of Islamabad. Physical facilities in term of experimental fields, laboratories, green houses, gene bank, library/ documentation, auditorium, machinery & lab equipment repair workshops, stores, hostels, cafeteria, audio visual studios, are also available at NARC.

Journal Article

期刊文章

Role of weather in fluctuating aphid density in wheat crop  [1994]

Aheer, G.M.; Ahmad, K.J.; Ali, A. (Ayub Agricultural Research Inst., Faisalabad (Pakistan). Entomology Section);

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Study was conducted during 1988-91 at Faisalabad to determine the role of temperature, relative humidity, rainfall and wind velocity in fluctuating aphid density in wheat. Fluctuation in pest population varied in different years. It was higher in 1988-89 and lower in 1990-91. Maximum aphid population was trapped in March. Wind velocity played a positive and significant role in fluctuating aphid density during 1990-91 (r = 0.798). All other factors for the years individually had no significant correlation with aphid density. However, multiple regression showed a significant trend between aphid density and weather factors for 1990-91. The contribution was 86.6 percent. Regression analysis for 1988-89 and 1989-90 did not respond significantly showing 16.00 and 33.40 percent contribution in fluctuating aphid density.
来自期刊
Journal of Agricultural Research (Pakistan)
ISSN : 0368-1157

书目信息

语言:
English
类型:
Numerical data
自何时收录于AGRIS:
1997
卷:
32
期:
3
起始页:
295
结束页:
301
所有题名:
"Role of weather in fluctuating aphid density in wheat crop"@eng
其它:
"Summary (En)"
"5 tables, 9 ref."
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书目信息

语言:
English
类型:
Numerical data
自何时收录于AGRIS:
1997
卷:
32
期:
3
起始页:
295
结束页:
301
所有题名:
"Role of weather in fluctuating aphid density in wheat crop"@eng
其它:
"Summary (En)"
"5 tables, 9 ref."