Effect of Nitrogen Sources and Phosphorus on Bulbs and Bulblets Production of Tuberose cv. Double

An experiment was laid during two consecutive years in Horticulture garden of CSAUA&T, Kanpur. There were three nitrogenous sources viz. urea ammonium sulphate and calcium ammonium nitrate, four levels of nitrogen viz 0,50,100 and 150 kg/ha, and four levels of phosphorus viz . 0,100,200 and 300 kg/ha thus consisting total number of forty treatments replicated thrice in Factorial Randomized Block Design. Calcium ammonium nitrate treatments revealed greater harvest of bulbs/clump both by number (9.43, 8.97) and weight (229.90, 235.0g) and bulblets/clump (10.56,10.80 and 115.78,123.14g) in first and second year, respectively. Nitrogen @100kg/ha produced highest bulblets per clump (10.50 and 11.09) during both the years of investigation. This trend was same regarding the weight which revealed 106.60 and 115.91 g respectively. The weight of bulbs and bulblets greatly influenced by application of phosphorus at the rate of 200kg/hectare It also induced maximum number and weight of bulblets (10.44,10.81 and 104.74,113.47 g) during both the years The highest dose of phosphorus 300 kg/ha reduced the number and weight of bulblets (10.19,10.29 and 93.75,105.60 g) during both the years of investigation.