Thumbnail Image

Theses

Browse

20181
Reset filters
Subject: Plant Breeding × Author: Barman, Surabhi × Start date: 2013 × Type: Thesis × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    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.