The experiment was carried out at the field laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh during the period from March 2002 to June 2002 to evaluate the effect of biofertilizer ( Bradyrhizobium ) and plant growth regulators (GA3 and IAA) on growth of summer mungbean ( Vigna radiata L.). The experiment was laid out by RCBD with three replications and two factors (variety and treatment). There were altogether 12 treatment combinations. Most of the growth parameters such as number of branches plant-1, number of leaves plant-1, number of effective nodules plant-1, number of non-effective nodules plant-1, root dry weight plant-1, nodule dry weight plant-1 was the height due to the application of biofertilizer ( Bradyrhizobium ). On the other hand, plant height, leave dry weight plant-1, shoot dry weight plant-1 and total dry weight plant-1 was the height due to the application of plant growth regulators (GA3 and IAA). However, biofertilizer ( Bradyrhizobium ) and plant growth regulators (GA3 and IAA) showed statistically identical performance on Crop Growth Rate (CGR) and Relative Growth Rate (RGR). In addition, among the mungbean varieties, Binamoog-5 performed better than that of Binamoog-2 and Binamoog-4.
[Show abstract][Hide abstract] ABSTRACT: This study was carried out to develop some new bioformulations and evaluate their efficacy in promoting cotton seedlings growth characteristics. The interest in the use of biological approaches to replace chemical agents in fertilizing soils or improve plant resistance against phytopathogens is at present in continuous growth. In this regard the use of plant growth promoting rhizobacteria (PGPR) has a potential role in developing sustainable systems for crop production. In search of efficient PGPR strains with multiple activities, we prepared four bioformulations using two isolates of Pseudomonas fluorescens Q18 (B1) and CKK-3 (B2) which were isolated from rhizospheric soil and cotton roots in Varamin's Cotton fields. For development the formulations we preparation of mineral carriers for increasing stability in interaction between associated PGPR and cotton plants, preparation of bacterial suspension and development of bioformulations included a talc-based powder and bentonite-based powder respectively. The results of a greenhouse experiment 60 days after sowing indicated that efficacy of BENT-B1 and TAL-B1 treatments were 1.38 and 1.35 fold, BENT-B1 and TAL-B1 treatments were 1.42 and 1.28 fold, TAL-B1 treatment was 3.37 fold and TAL-B1 treatment was 2.60 respectively on promoting seedling height, root length, seedling dry weight and root dry weight more effective than the control treatment.
International Proceedings of Chemical, Biological and Environmental Engineering; 06/2011
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