Browsing by Author "Geetha, K. N"
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ThesisItem Open Access EFFICACY OF ORGANIC MANURES, FLY ASH AND HYDROGEL ON MOISTURE RETENTION AND PRODUCTIVITY OF SUNFLOWER (Helianthus annuus L.) IN ALFISOLS(UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU, 2016-07-21) PRATHIBHA, S; Geetha, K. NA field experiment was conducted to study the efficacy of organic manures, fly ash and hydrogel on moisture retention and productivity of sunflower (Helianthus annuus L.) in alfisols at All India Coordinated Research Project on Sunflower, Zonal Agricultural Research Station, UAS, GKVK, Bengaluru during kharif-2015. The experiment was laid out in RCBD with nine treatments replicated thrice. Treatments included application of RDF (Recommended Dose of Fertilizer) (90:90:60 kg NPK ha-1) alone, RDF + FYM (2.5 and 5 t ha-1), RDF + hydrogel (2.5, 5.0 and 7.5 kg ha-1), RDF + humic acid (2.5 kg ha-1), RDF + vermicompost (2.5 t ha-1) at the time of sowing and RDF + fly ash (2 t ha-1) at 4th leaf stage. The treatment with RDF + hydrogel @ 7.5 kg ha-1 resulted significantly higher seed and oil yield (2461 kg ha-1 and 907.3 kg ha-1, respectively). It was attributed by enhanced growth parameters viz., plant height (167.0 cm), number of leaves plant-1 (24.13), leaf area (6663 cm2 plant-1), total dry matter (58.19 g plant-1) at 60 DAS and yield attributes like increased head diameter (16.70 cm), test weight (5.03 g 100 seeds-1), total seeds and filled seeds (1081 and 998.9 head-1, respectively) and lower chaffiness (7.65 %). Soil moisture retention and uptake of N, P and K (107.9, 23.72, 88.41 kg ha-1, respectively) also recorded higher values. Net returns (` 60128 ha-1) and benefit cost ratio (3.19) was higher with application of RDF + fly ash @ 2 t ha-1 at 4th leaf stagThesisItem Open Access INTEGRATION OF PRE AND POST-EMERGENCE HERBICIDES AND CULTURAL PRACTICES FOR WEED MANAGEMENT IN SUNFLOWER (Helianthus annuus L.)(UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU, 2015-07-10) ROHINI, N. METI; Geetha, K. NA field experiment was conducted during Kharif 2014 at AICRP on sunflower, ZARS, UAS, Bengaluru. The experiment consisted of nine treatments laid out in randomized block design. In this experiment one pre-emergence, four post-emergence herbicides and farmers practice i. e., two IC at 20 and 40 DAS + one HW at 30 DAS, which was compared with three hand weedings at 15, 30 and 45 DAS and unweeded check. Among the different weed management practices, application of pendimethalin at 1.0 kg a. i. ha-1 as PE + quizalofop-ethyl 10 EC at 37.5 g a. i. ha-1 at 17 DAS as directed POE on weeds recorded significantly higher seed and oil yield (1797 and 675 kg ha-1, respectively) which was found to be on par with weed free (1824 and 697.4 kg ha-1, respectively) and farmers practice (1888 and 726.4 kg ha-1, respectively). These treatments registered lower weed density and dry weight at harvest (11.13, 7.56 and 9.57 no. m-2 and 10.00, 7.39 and 5.51 g m-2, respectively). The yield components: seed yield capitulum-1 (30.33, 30.93 and 34.33 g), capitulum diameter (17.40, 18.00 and 18.60 cm) and hundred seeds weight (4.42, 4.56 and 4.78 g) were significantly higher with the same treatments. Though highest net returns (` 35,092 ha-1) was recorded in farmers practice, highest MR:MC (10.75) and B:C ratio (2.73) were recorded in pendimethalin at 1.0 kg a. i. ha-1 as PE + quizalofop-ethyl 10 EC at 37.5 g a. i. ha-1 at 17 DAS as directed POE on weeds.