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Anand Agricultural University, Anand

Anand Agricultural University (AAU) was established in 2004 at Anand with the support of the Government of Gujarat, Act No.(Guj 5 of 2004) dated April 29, 2004. Caved out of the erstwhile Gujarat Agricultural University (GAU), the dream institution of Sardar Vallabhbhai Patel and Dr. K. M. Munshi, the AAU was set up to provide support to the farming community in three facets namely education, research and extension activities in Agriculture, Horticulture Engineering, product Processing and Home Science. At present there seven Colleges, seventeen Research Centers and six Extension Education Institute working in nine districts of Gujarat namely Ahmedabad, Anand, Dahod, Kheda, Panchmahal, Vadodara, Mahisagar, Botad and Chhotaudepur AAU's activities have expanded to span newer commodity sectors such as soil health card, bio-diesel, medicinal plants apart from the mandatory ones like rice, maize, tobacco, vegetable crops, fruit crops, forage crops, animal breeding, nutrition and dairy products etc. the core of AAU's operating philosophy however, continues to create the partnership between the rural people and committed academic as the basic for sustainable rural development. In pursuing its various programmes AAU's overall mission is to promote sustainable growth and economic independence in rural society. AAU aims to do this through education, research and extension education. Thus, AAU works towards the empowerment of the farmers.

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Subject: Agricultural Meteorology × Author: RAVIPATI, MAHENDRA KUMAR × End date: 1999 × Start date: 1990 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    CROP WEATHER RELATIONSHIPS AND POPULATION DYNAMICS OF Helicoverpa armigera IN TWO PIGEON PEA (Cajanus cajan L.) CULTIVARS IN MIDDLE GUJARAT AGROCLIMATIC REGION
    (AAU, Anand, 1996) RAVIPATI, MAHENDRA KUMAR; Savani, M. B.
    Pigeonpea [Cajanus cajan L.) is one of the major grain legume crop in tropical and sub - tropical regions of India and grown mainly as rainfed crop. The crop is characterised as drought resistant and the productivity is different in different environments. Since the effects of weather on yield are complex, the deep and clear understanding of the effect of weather parameters on the growth and development of pigeonpea is necessary. An experiment was conducted during the Kharif season of the, year 1994 at Anand to study the crop-weather relationship and crop-weather-pest dynamics in two cvs.BDN-2 and GT-100 of pigeonpea. The field experiment was laid out in split plot design with four replications. The treatments comprised of two irrigation levels, two plant protection levels, two varieties, and three dates of sowing. The results obtained during the course of investigation revealed that weather played significant role in growth, development and yield of pigeonpea. The variations in days taken to complete the different phenophases among the different dates of sowing were attributed due to the variations in temperature and photoperiod. The number of days required for the completion of any phenophase was declined with increase in the temperature and photoperiod. The yield and yield attributes were significantly influenced by irrigation and dates of sowing. The grain yield, biomass, and number of pods per plant were observed more in D1 than in D2, and D3. Grain yield, biomass, and number of pods per plant declined with the application of irrigation. The irrigated crop puts up more biomass initially but it was declined considerably than in unirrigated crop in the later phases due to heavy attack of the larvae of Helicoverpa. The different agrometeorological indices like GDD, PTU and HTU has positive and significant correlation with days taken for the completion of the different phenopases, eccept for the phenophase P4. The thermal time (GDD) has highly significant correlations with days taken for different phenophases. Functional relations were developed to predict the number of days required for different phenophases in both the cultivars BDN-2 and GT-100. The leaf area index (LAI) and crop growth rate (CGR) were found to be influenced by irrigation and sowing time. The crop sown in D1 maintained more LAI and CGR in both the cultivars, compared to D2 and D3, The decline in the values of LAI and CGR during flowering phase in both the cultivars was due to heavy infestation of Helicoverpa. The radiation use efficiency (RUE), on seasonal basis was found to be high in rainfed crop compared to irrigated crop. The RUE was high in D1 sown crop, and was declined in the delayed sowings. The RUE was found high in cv.GT-100 compared to cv.BDN-2. Functional relations were developed to estimate the near surface soil moisture content under developing conopics of pigeonpea using remotely sensed canopy and air temperatures, and the LAI. A linear relationship was observed between evapotranspiration and canopy-air temperature differential. The relation was found closely related, when the variations due to energy load was accounted. The populations of the eggs and larvae of the Helicoverpa were found to be highest in first date of sowing (D1) both at 50% flowering and 50% podding phases compared to D2 and D3. The cultivar GT-100 was found more succeptible to Helicoverpa due to the early flowering character than cv.BDN- 2. The larval population of Helicoverpa in pigeonpea was found significantly correlated with air temperature, vapour pressure and pan evaporation.