ROOT BIOMASS ACCUMULATION IN VETCH (Vicia sativa L.) AFTER TREATMENT WITH ORGANIC FERTILIZER

DOI: 10.7904/2068–4738–VI(11)–100

Viliana VASILEVA

Institute of Forage Crops, 89 “Gen. Vladimir Vazov” Str., Pleven 5800, Bulgaria,
E–mail: viliana.vasileva@gmail.com

Abstract. Effect of the treatment with organic fertilizer Humustim on root biomass accumulation in vetch (Vicia sativa L.) (cv. Obrazets 666) was studied in a field trial carried out at the Institute of Forage Crops, Pleven, Bulgaria. Several doses of fertilizer were applied to the seed as a pre–sowing treatment, and during the vegetation growth phase (growing up and flowering stage), and as a combination between them. It was found that Humustim applications at all stages and rates resulted in increased root biomass. Plants accumulated from 661 to 717 kg/ha fresh, and from 254 to 280 kg/ha dry root biomass, which was 17.3 and 19.7%, respectively more than the untreated control. Humustim represent an excellent fertilizer in the modern trends such as sustainable agriculture and organic farming.

Keyword: Humustim, organic fertilizer, root biomass, vetch

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GENETIC ANALYSIS OF CHARACTER ASSOCIATION FOR POLYGENIC TRAITS IN SOME RECOMBINANT INBRED LINES (RIL’S) OF RICE (Oryza sativa L.)

DOI: 10.7904/2068–4738–VI(11)–90

Awaneet KUMAR1*, B.K. SENAPATI 2

1Ph. D Scholar; 2Associate Professor & Head, Department of Genetics & Plant Breeding,
Bidhan Chandra KrishiVishwavidyalaya, Mohanpur–741252, Nadia, West Bengal, INDIA
*Corresponding author E–mail: awaneet.nikhil@gmail.com

Abstract. Fourteen recombinant inbred lines (RIL’s) obtained from IR 30 and Basmati 370 were evaluated along with two popular varieties viz. Khitish (IET4094) and Minikit (IET 4786) for 14 biometrical characters during summer 2012 at Regional Research Station, New alluvial Zone, Chakadaha, Nadia, Bidhan Chandra KrishiVishwavidyalaya, Mohanpur, West Bengal, India., in Randomized Block Design with two replications. Except number of primary branches per panicle, grain breadth and kernel breadth all the characters studied showed significant differences among the genotypes. Four lines (S7, S10, S13 and S14) possessed significantly higher grain yield than superior check variety. The high estimates of GCV and PCV were obtained for number of panicle per plant, grain yield per plant, floret number per panicle, number of grains per panicle and panicle weight. High heritability was observed for number of panicle per plant, kernel L/B ratio, kernel length, 1000 grain weight and grain L/B ratio. High genetic advance was observed for number of grain per panicle, floret number per panicle, grain yield per plant, number of secondary branches per panicle and 1000 grain weight respectively while lowest genetic advance was observed in kernel breadth. Genetic advance as percentage of mean was highest for number of panicle per plant followed by grain yield per plant, florets number per panicle and Kernel L/B ratio while lowest was recorded for kernel breadth. High heritability coupled with high genetic advance was obtained for number of grains per panicle, 1000 grain weight, kernel length and grain yield per plant. It indicated the predominance of additive gene action for controlling these characters. Therefore, these characters can be improved simply through selection. High heritability associated with low genetic advance was observed for panicle weight, grain length, grain L/B ratio and kernel L/B ratio. It suggested non–additive gene action for the expressions of these characters. The magnitude of genotypic correlation coefficient was in general higher than that of the corresponding phenotypic ones. Grain yield per plant was significantly positively correlated with number of panicles per plant, floret number per panicle and number of grain per panicle. The kernel length imparted the highest positive direct effect on grain yield per plant followed by number of grain per panicle, number of panicle per plant and panicle weight.

Keyword: recombinant inbred lines (RIL’s), correlation, genetic advance, heritability and path coefficient.

NODULATION DYNAMICS IN ALFALFA VARIETIES (Medicago sativa L.)

DOI: 10.7904/2068–4738–VI(11)–83

Natalia GEORGIEVA

Institute of Forage crops, 5800–Pleven, Gen. V. Vazov street, 89, BULGARIA,
e–mail: imnatalia@abv.bg

Abstract. Eight Bulgarian alfalfa varieties (Prista 2, Prista 3, Prista 4, Obnova 10, Pleven 6, Dara, Multifoliate and Dama) and one French variety (Europe) were cultivated on slightly leached chernozem in Institute of Forage Crops (Pleven) during the period 2006–2009. The dynamics in alfalfa nodulation by years showed the greatest number of nodules on average per plant was formed during the second year of development (8.1) followed by third (6.5) and first year (6.3). Least nodules were formed in the fourth year (1.2) as the decrease to the previous three years was sensitive (by 82.9%). In all years (except first year) the intensity of nodulation decreased from spring regrowth to summer and autumn regrowth. The main quantity of nodules was situated on the lateral roots as in the first year their percentage was 52.4 and during the second, third and fourth year–86.4, 95.4 and 100% respectively. With most pronounced nodule–forming ability for the Bulgarian varieties were Obnova 10 and Multifoliate and the French variety Europe.The alfalfa nodulation correlated with important parameters: age of stand (r= –0.729), stand density (r= –0.648), number of stems per plant (r= 0.763) and weight of root mass (r= 0.384).
Keyword: alfalfa, correlations, nodulation, varieties