Effect of Different Method of Rice Establishment and Weed Management Options on Yield and Economics of Paddy

A field experiment was conducted during rabi 2022 at Zonal Agricultural and Horticultural Research Station, Brahmavara, Udupi, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Shivamogga, on sandy loam soil to study the effect of different method of rice establishment and weed management options on yield and economics of paddy. The experiment was laid out in Factorial Randomized Complete Block Design with broadcasting and drum seeder method of establishment and five treatment combinations, replicated thrice. The study revealed that, the weed free treatment maintained by hand weeding recorded highest growth parameters and rice grain yield. The sequential application of pre-emergence herbicide pendimethalin 38.7 % CS @ 750 g a.i. ha-1 at 0-3 DAS (fb) early post-emergence application of bispyribac sodium 10 % SC @ 25 g a.i ha-1 at 13-15 DAS, recorded lowest total weed density (36.92, 31.73 and 40.45 No. m-2) at 15, 30 and 45 DAS, respectively and lower weed index (7.23%) under drum seeder method of establishment . The yield and yield attributing parameters like number of tillers (291.33 m-2), panicle length (19 cm), filled grains (89.33 panicle-1), grain yield (4221 kg ha-1) and straw yield (5387 kg ha-1) were observed in sequential application of pre-emergence herbicide pendimethalin 38.7 % CS @ 750 g a.i. ha-1 at 0-3 DAS (fb) early post-emergence application of bispyribac sodium 10 % SC @ 25 g a.i ha-1 at 13-15 DAS under the drum seeder method of establishment. The highest net return (? 82586 ha-1) and B:C ratio (2.81) was also recorded in the same treatment.

Appraisal of Magic Lines of Rice (Oryza sativa L.) for Genetic Variability, Character Association and Path Analysis Studies

An investigation was carried out to estimate genetic parameters, assess association and path coefficient analysis among growth, yield and yield attributes in Multiparent Advanced Generation Intercross (MAGIC) lines of Rice (Oryza sativa L.). A total of 100 MAGIC lines along with seven checks were evaluated in augmented design during summer 2022 at ZAHRS, KSNUAHS, Shivamogga. Analysis of variance revealed significant differences among the advanced lines for all the traits under study. The variability studies among the lines revealed a higher Genotypic Coefficient of Variation (GCV), Phenotypic Coefficient of Variation (PCV), heritability and Genetic Advance as Percent of Mean (GAM) for majority of traits. The correlation and path coefficient analysis revealed that traits tillers per plant, productive tillers per plant, panicle length, number of spikelets per panicle, number of filled grains per panicle, spikelet fertility, test weight and length/breadth ratio were positively associated with yield. Selection of lines with higher filled grains per panicle would be effective for yield improvement program along with the higher percentages of productive tillers per plant, panicle length and spikelet fertility.

Effect of Different Farming Types on Growth, Yield and Yield Attributing Parameters of Finger Millet under Finger Millet Based Intercropping Systems

A field experiment was conducted on performance of finger millet based inter cropping system under different farming types during kharif 2019-20 and 2020-21 at College of Agriculture, KSN UAHS Shivamogga. The Experiment was laid out with split-plot design having Three farming types as main plots (conventional, organic, and natural farming) and finger millet based inter cropping system as subplots (Finger millet + red gram, finger millet + field bean, Sole finger millet, sole red gram and sole field bean) in three replications. Among different farming types, conventional farming type recorded significantly higher yield parameters viz., number of productive tillers hill-1 (5.14), number of ear heads hill-1(3.83), number of fingers per ear head (6.31), number of grains ear head-1 (4002.50), and test weight (3.71 g) there by achieved significantly higher grain yield (2449.83 kg ha-1) and straw yield (3957.42 kg ha-1) as compared to organic (2039.67 kg ha-1 and 3297.30 kg ha-1) and natural farming (1470.83 kg ha-1and 2328.35 kg ha-1) respectively. Among the finger millet based inter cropping system, the higher grain and straw yield (2225.67 kg ha-1 and 3561.13 kg ha-1) respectively was recorded in sole finger millet as compare to finger millet + redgram (1991.67 kg ha-1 and 3243.17 kg ha-1) respectively and finger millet + field bean (1743.00 kg ha-1 and 2778.77 kg ha-1) respectively. Whereas, the interaction effect between farming types and finger millet based intercropping systems was found non-significant.