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Assam Agricultural University, Jorhat

Assam Agricultural University is the first institution of its kind in the whole of North-Eastern Region of India. The main goal of this institution is to produce globally competitive human resources in farm sectorand to carry out research in both conventional and frontier areas for production optimization as well as to disseminate the generated technologies as public good for benefitting the food growers/produces and traders involved in the sector while emphasizing on sustainability, equity and overall food security at household level. Genesis of AAU - The embryo of the agricultural research in the state of Assam was formed as early as 1897 with the establishment of the Upper Shillong Experimental Farm (now in Meghalaya) just after about a decade of creation of the agricultural department in 1882. However, the seeds of agricultural research in today’s Assam were sown in the dawn of the twentieth century with the establishment of two Rice Experimental Stations, one at Karimganj in Barak valley in 1913 and the other at Titabor in Brahmaputra valley in 1923. Subsequent to these research stations, a number of research stations were established to conduct research on important crops, more specifically, jute, pulses, oilseeds etc. The Assam Agricultural University was established on April 1, 1969 under The Assam Agricultural University Act, 1968’ with the mandate of imparting farm education, conduct research in agriculture and allied sciences and to effectively disseminate technologies so generated. Before establishment of the University, there were altogether 17 research schemes/projects in the state under the Department of Agriculture. By July 1973, all the research projects and 10 experimental farms were transferred by the Government of Assam to the AAU which already inherited the College of Agriculture and its farm at Barbheta, Jorhat and College of Veterinary Sciences at Khanapara, Guwahati. Subsequently, College of Community Science at Jorhat (1969), College of Fisheries at Raha (1988), Biswanath College of Agriculture at Biswanath Chariali (1988) and Lakhimpur College of Veterinary Science at Joyhing, North Lakhimpur (1988) were established. Presently, the University has three more colleges under its jurisdiction, viz., Sarat Chandra Singha College of Agriculture, Chapar, College of Horticulture, Nalbari & College of Sericulture, Titabar. Similarly, few more regional research stations at Shillongani, Diphu, Gossaigaon, Lakhimpur; and commodity research stations at Kahikuchi, Buralikson, Tinsukia, Kharua, Burnihat and Mandira were added to generate location and crop specific agricultural production packages.

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20181
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Subject: Plant Breeding × Author: Barman, Surabhi × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Evaluation of maize (Zea mays L.) hybrids for morphological traits and nitrogen use efficiency
    (AAU, Jorhat, 2018-07) Barman, Surabhi; Sarma Barua, N.
    Maize (Zea mays L.) hybrids are potential genetic forms in which a productive heterozygous variety may be retained. These are high yielder as well as heavy feeder of nitrogen. There is a need to look in to such hybrids for higher yield, resistance to important diseases as well as higher nitrogen use efficiency (NUE). The present investigation was carried out to evaluate maize hybrids for morphological traits, incidence of Turcicum leaf blight, nitrogen use efficiency and related traits and determine the extent of genetic variation and correlation for the traits. Eleven companybred maize hybrids were evaluated along with a hybrid check Vivek Maize Hybrid 47 in RBD during rabi season of 2016-17 at ICR Farm, Assam Agricultural University, Jorhat under two levels of N- fertilization. The mean square due to genotype was significant for each of the morphological and physiological traits under study. The comparison of mean performance of the genotypes revealed that hybrids viz., CP 333 and NMH 666 recorded the highest grain yield. CP 333 also exhibited higher estimates for other favourable traits viz., ear diameter, 100 kernel weight, root volume, total plant nitrogen, total grain nitrogen and nitrogen use efficiency. NMH 666 also exhibited high mean performance for other traits viz., plant height, ear length, leaf area, root volume, total plant nitrogen and total grain nitrogen. Vivek Maize Hybrid 47, NMH 731, NMH 713 and CP 838 were the earliest varieties in respect of days to 50% pollen shed, days to 50% silk and days to 75% dry husk. High estimates of genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) were observed for grain yield per plant, ears per plant, whole plant biomass, total plant nitrogen, total grain nitrogen, root biomass and nitrogen use efficiency. Heritability (h2) coupled with genetic advance as percent mean (Gs%) were high for grain yield per plant, ears per plant, whole plant biomass, root biomass, total plant nitrogen, total grain nitrogen and nitrogen use efficiency. Therefore, simple selection methods for improvement of these traits would be effective. Grain yield per plant had significant and positive correlation with the traits ears per plant, whole plant biomass, total plant nitrogen, total grain nitrogen and nitrogen use efficiency at both phenotypic and genotypic levels. Hence, indirect selection for improving grain yield based on correlated simple traits would be effective. No symptoms of Turcicum Leaf Blight (TLB) were observed in the hybrids under the field condition during Rabi season of 2016-2017.