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20111
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Subject: Agronomy × Author: B.T. Nadagouda × End date: 2018 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Precision Nutrient Management in Sugarcane (Saccharum officinarum L.)
    (UAS Dharwad, 2011) B.T. Nadagouda; S.M. Hiremath
    Field experiments were conducted to study the precision nutrients management in sugarcane during 2005-2008 at Research and Development Farm, Krishna Nagar. Initial nutrients status of soil varied in farmers field from 149 kg N/ha to 325 kg N/ha and in grids of 10 m x 10 m it ranged from 140 kg N/ha to 245 kg N/ha. Yield variations in grids of uniformity trial was 82.7 t/ha - 128.2 t/ha. Nutrients uptake by the crop ranged between 148.9 – 547.4 kg N/ha, 2.48 – 15.61 kg P/ha and 124.8 – 434.2 kg K/ha. Drip irrigated plant cane crop and fertigated plots recorded significantly superior yield (146.7 t/ha) over furrow irrigated plots (124.0 t/ha) (check). Fertigation interval or for fertilizer doses did not exhibit marked variations in yield under drip of irrigation. Significantly higher values of quality traits were observed in furrow irrigated plots over the drip plots. Sugarcane yield in drip irrigated ratoon crop was also significantly (84.62 t/ha) more over furrow irrigated check plot (63.60 t/ha). In farmers fields, the crop recorded significantly higher yield (139.7 t/ha) in relatively high nitrogen containing soils over the low soil nitrogen containing groups (119.0 t/ha). Relatively high soil nitrogen containing group recorded high ratoon yield (126.2 t/ha) than soils with throw nitrogen (109.4 t/ha). Drip irrigation with fertigation at monthly intervals of nitrogen (urea) and potassium (MOP) from 90 days after planting/ratooning to 240 days in 6 equal splits and basal application of phosphorus (SSP) and vermicompost or FYM recorded higher net returns. The B:C ratio of drip irrigated plots were lower than those of the furrow irrigated split applied nutrients plots due to higher cost of drip irrigation system. The economic returns are much higher either in drip or split applied nutrients in furrow irrigated crop compared to the general practices followed by the farmers particularly in ratoon crop.