Choudhary, J.SHARMA, RAJARAM2020-12-182020-12-182020Sharma R. And Choudhary J.https://krishikosh.egranth.ac.in/handle/1/5810156921Performance of Wheat under Varying Levels of Silicon and Restricted IrrigationA field experiment entitled “Performance of Wheat (Triticum aestivum L.) under Varying Levels of Silicon and Restricted Irrigation” have been conducted on clay loam soil of Instructional Farm, Department of Agronomy, Rajasthan college of Agriculture, Maharana Pratap University of Agriculture and Technology, Udaipur during rabi 2019-2020. The treatments comprising four irrigation levels (I1: no irrigation, I2: one irrigation at CRI, I3: two irrigation at CRI and booting stage and I4: three irrigation at CRI, booting and milking stage) and four silicon levels (S1: control, S2: 100 kg ha-1, S3: 150 kg ha-1 and S4: 200 kg ha-1), assigned respectively to main and sub plots and those were replicated three times in split plot design. For such experiment wheat variety “MP 3336” was used. Results revealed that under three irrigations crop obtained highest value of growth parameters (plant height, dry matter accumulation, total tillers, flag leaf area, days to 50 per cent heading and days to 50 per cent maturity) and yield attributes viz., effective tillers, grains ear-1, weight of grains ear-1, ear length and test weight as compared to other irrigation levels. However, the maximum crop growth rate between 50 to 75 DAS under one irrigation and between 75 DAS to at harvest under two irrigations however, highest relative growth rate was recorded under no irrigation. Superior performance of growth and yield attributes with three irrigations resulted in significant increased in grain, straw, biological yield and harvest index. Similarly, maximum protein content, chlorophyll content and relative water content were also recorded with three irrigation levels, while maximum proline content was recorded with control treatment. Application of three irrigations recorded maximum nitrogen, _______________________________ * M.Sc. (Ag.) Scholar, Department of Agronomy, Rajasthan College of Agriculture, MPUAT, Udaipur-313 001 (Rajasthan) ** Assistant Professor, Department of Agronomy, Rajasthan College of Agriculture, MPUAT, Udaipur-313 001 (Rajasthan) phosphorous and potassium content and uptake by grain and straw compared to rest of the irrigation treatments. Similarly, maximum nitrogen, phosphorous, potassium and silicon content in soil was obtained in three irrigations. The higher net return (` 67180 ha-1) and B-C ratio (1.99) were obtained under three irrigations. Application of silicon 200 kg ha-1 significantly increased growth parameters viz., plant height, dry matter accumulation, total tillers, crop growth rate, flag leaf area, days to 50 per cent heading and days to 50 per cent maturity and yield attributes i.e., effective tillers, grains ear-1, weight of grains ear-1, ear length and test weight as compared to remaining silicon levels. The maximum grain, straw, biological yield and harvest index were obtained under silicon application 200 kg ha-1 resulted in highest. Grain protein content, total chlorophyll content, relative water content also increased with silicon 200 kg ha-1. Whereas, proline content in leaves deceased with increasing level of silicon in soil. Further application of silicon 200 kg ha-1 significantly recorded maximum nitrogen, phosphorous and potassium content and uptake in grain and straw compared to other silicon levels. Similarly maximum nitrogen, phosphorous, potassium and silicon content in soil was obtained in silicon 200 kg ha-1 treatment. Application of silicon 200 kg ha-1 resulted in significantly higher net return (` 58770 ha-1) and B-C ratio (1.79) compared to other silicon levels.EnglishThesis