Sharma, K. K.Bora, Sarat Sekhar2022-02-262022-02-262018-07https://krishikosh.egranth.ac.in/handle/1/5810182953A field experiment was carried out at the Instructional-cum-Research (ICR) farm, Assam Agricultural University, Jorhat during 2016-2017. The experiment was laid out in split-plot design replicated thrice to assess the “Effect of nitrogen levels and seed rate on fodder productivity of rye grass (Loliummultiflorum)”. The treatments consisted of three different seed rates in main plot viz., 10 kg/ha, 15 kg/ha and 20 kg/ha along with four nitrogen levelsviz.0 kg/ha, 30 kg/ha, 60 kg/haand 90 kg/ha in sub-plots. It was revealed that effect of seed rates of rye grass was found to be significant on various growth and yield parameters. A seed rate of 20 kg/ha was found to be statistically superior in regards to growth parameters in all the three cuts viz. 1st, 2nd and 3rd cut as compared to15 kg and10 kg seed rate/ha. The highest green forage yield(330.30 q/ha) andcrude protein yield (6.21 q/ha)were obtained withseed rate of 20 kg/haand was significantly superior to 15 kg/ha and 10 kg/ha. The dry matter yield were also found to be significantly higher in seed rate of 20 kg/ha (71.88 q/ha). Effect of graded dose of nitrogen revealed that increasing levels of nitrogen from 0 kg to 90 kg/ha has sown positive trend in almost all the growth and yield parameters. Application of 90 kg N/ha resulted in higher values in almost all the growth and yield parameters. The highest green forage yield (381.43 q/ha) dry matter yield (83.179 q/ha) and crude protein yield (7.43 q/ha) were obtained in 90 kg N /ha and was found to be significantly superior to all other lower doses of nitrogen (60kg and 30 kgN/ha). Interaction effect of seed rate and nitrogen levels were found to be significant in respect of important parameters like plant height,tillers/m2, green forage yield,drymatter yield and crude protein yield. Economic indices indicated that the highest net return ofRs. 51253.00and B:C ratio of 1.58 were recorded in 20 kg/ha seed rate as compared to other lower seed rate (15 kg and 10 kg/ha).In case of nitrogen levels, higher net return was founddue to application of 90 kg N/ha (Rs. 48777.00/ha) with B:C ratio of 1.59. The present investigation revealed that rye grass as rabiforage crop responded positively to increase levels of seed rate and nitrogen in respect of forage productivity and quality. Application of 20kg /ha seed rate in combination with 90kg N/ha has been found to be more productive and profitable in rye grass.EnglishThesis