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ThesisItem Open Access Fertilizer management and sulphur nutrition of toria in rice fallow under rainfed condition(AAU, Jorhat, 2018-07) Basumatary, Anjali; Ojha, N. J.A field experiment entitled “Fertilizer management and sulphur nutrition of toria in rice fallow under rainfed condition” was conducted at Instructional-cum-Research (ICR) Farm, Assam Agricultural University, Jorhat during rabi seasons of 2016-17 and 2017-18 with a view to find out the fertilizer dose and sulphur requirement of late sown toria (Jeuti). The experiment was laid out in factorial randomized block design with three replications. The treatment consisted of three levels of NPK viz.,F1: 30.00-26.25-11.25 kg N-P2O5-K2O/ha (75% of RDF), F2: 40.00-35.00-15.00 kg N-P2O5-K2O/ha (100% of RDF) and F3: 50.00-43.75-18.75 kg N-P2O5-K2O/ha (125% of RDF) and five levels of sulphur S1: 0 kg S/ha, S2: 5 kg S/ha, S3: 10 kg S/ha, S4: 15 kg S/ha and S5: 20 kg S/ha. The soils of the experimental site was sandy loam in texture, acidic in reaction (pH- 5.4 and 5.3), medium in organic carbon (0.50% and 0.48%), available N (313.60 kg/ha and 298.24 kg/ha), and available K2O (174.72 kg/ha and 170 kg/ha) and low in available P2O5 (20.51 kg/ha and 19.95 kg/ha) and available S (16.24 kg/ha and 15.00 kg/ha) in the year 2016-17 and 2017-18, respectively. Among all the biometric observations growth, yield attributing characteristics, seed and stover yields were significantly influenced due to application of NPK levels. Application of 50.00-43.75-18.75 kg N-P2O5-K2O/ha (125% of RDF) gave significantly higher values in almost all the characters under study which was statistically at par with 40.00-35.00-15.00 kg N-P2O5-K2O/ha (100% of RDF). The higher seed yield (824.53 and 799.33 kg/ha in both the years, respectively) was recorded by application of 50.00-43.75-18.75 kg N-P2O5-K2O/ha (125% of RDF) which was at par with the seed yield (796.60 and 766.40 kg/ha in both years, respectively) obtained by application of 40.00-35.00-15.00 kg N-P2O5-K2O/ha (100% of RDF). Oil content, oil yield, N, P, K and S content and uptake also increased with increasing levels of NPK. Experimental findings revealed that the growth and yield attributing characters were increased with increasing levels of sulphur. All the parameters were highest at 20 kg S/ha which produced significantly higher seed yield (910.89 and 885.49 kg/ha in both the years, respectively) as compared to other levels. As regard to oil content, oil yield, N, P, K and S content and uptake, the values were significantly higher with 20 kg S/ha. The highest agronomic efficiency and apparent recovery was also recorded at 20 kg S/ha. The highest interaction effect was recorded due to combined application of 50.00-43.75-18.75 kg N-P2O5-K2O/ha (125% of RDF) and 20 kg S/ha in respect of number of seeds/siliqua, seed, stover and oil yield and N uptake which was at par with combined application of 40.00-35.00-15.00 kg N-P2O5-K2O/ha (100% of RDF) and 20 kg S/ha. In terms of economics, the highest net return ( 30739.88 and 29243.72 in both the years, respectively) and benefit:cost ratio (2.38 and 2.32, in both the years, respectively) was obtained by combined application of 40.00-35.00-15.00 kg N-P2O5-K2O/ha (100% RDF) and 20 kg S/ha.
