Response of late sown wheat to irrigation and nitrogen levels and validation of DSSAT model

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dc.contributor.advisorPannu, R.K.
dc.contributor.authorMukesh
dc.date.accessioned2017-06-03T03:38:50Z
dc.date.available2017-06-03T03:38:50Z
dc.date.issued2014
dc.description.abstractThe investigation entitled “Response of late sown wheat to irrigation and nitrogen levels and validation of DSSAT model” was carried out at the Research farm of Chaudhary Charan Singh Haryana Agricultural University, Hisar during Rabi seasons of 2010-11 and 2011-12. The experiment consisting of three irrigation levels viz. one irrigation at CRI (I1), two irrigations at CRI and heading (I2) and four irrigations at CRI, late tillering, heading and milking (I3) in main plots and five nitrogen levels viz. control i.e. 0 kg N/ha (F0), 50 kg N/ha (F1), 100 kg N/ha (F2), recommended dose of nitrogen i.e. 150 kg N/ha (F3) and 200kg N/ha (F4) in sub-plots was laid out in strip plot design with four replications. The plant height, dry matter accumulation, CGR, LAI and LAD increased with increase in irrigation frequency. Among the yield attributes number of effective tillers per mrl, number of grains/spike, test weight, spike length and number of spikelets/spike increased significantly with increase in irrigation frequency. The grain yield increased by 50.6 and 47.5% over I1 and 20.4 and 21.9% over I2 in I3 (3832 and 3989 kg/ha) during 2010-11 and 2011-12, respectively. The increase in irrigation frequency increased the N (33.4 and 31.3 %), P (42.2 and 42.3 %) and K (26.7 and 25.1 %) over I1 and N (16.0 and 15.9 %), P (19.4 and 20.7 %) and K (11.2 and 13.5 %) over I2 in I3 treatment during two years of study, respectively. The NUE also increased by 48.7 and 45.6 % over I1 and 19.8 and 21.2 % over I2 in I3 treatment during both the year of experimentation, respectively. The increased doses of nitrogen application also increased the plant height, dry matter accumulation, CGR, LAI, LAD and the yield attributes number of effective tillers per mrl, number of grain/spike, test weight, spike length and number of spikelets/spike significantly. Nitrogen application responded yields significantly upto 150 kg N/ha. The maximum total N (100.1 and 105.1 kg/ha), P (10 and 10.4 kg/ha) and K (93.9 and 99.4 kg/ha) uptake was recorded with the application of 200 kg N/ha during 2010-11 and 2011-12, respectively and decreased with decreasing dose of nitrogen.The economic optimum dose for late sown wheat computed was 122.1 kg N/ha for one irrigation, 167.4 kg N/ha for two irrigation and 174.3 kg N/ha for four irrigation, respectively. The DSSAT modelv4.5 validated for Hisar condition to estimate the yield, LAI and nitrogen uptake. The simulated results were within the permissible limit of the error. Maximum net profit (`25600 and ` 24171) and BC ratio (1.55 and 1.46) was recorded with the application of four irrigation with 200 kg N/ha (I3F4) during 2010-11 and 2011-12, respectively.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810014450
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subAgronomy
dc.subjectirrigation, nitrogen, wheats, yields, developmental stages, grain, crops, planting, biological development, crop residuesen_US
dc.these.typePh.D
dc.titleResponse of late sown wheat to irrigation and nitrogen levels and validation of DSSAT modelen_US
dc.typeThesisen_US
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