An experiment was conducted at Regional Sugarcane Research Station (RSRS). Thakurgaon during 2005-06 and 2006-07 cropping seasons to asses effects of different levels of irrigation and split application of N-K fertilizers in sugarcane (var. Isd 36) intercropped with potato (var. Diamond). The intercrop, potato received recommended fertilizer as usual. Application of Urea and Potash (N-K fertilizers) in two splits (B 1) produced highest number of tiller, millable cane and also highest yield in both levels of irrigation in both years. Though the difference was not significant over B 2 and B 3. But irrigation level A 1 (Six light irrigation with 65 mm effective rainfall) had significant difference over A 2 (five comparatively deep irrigation with same effective rainfall). Highest number of tiller (215.3*10 3 ha -1), millable cane (114.7*10 3 ha -1) and cane yield (109.9 t ha -1) were produced by the treatment B 1 under A 1 level of irrigation in the crop year 2006-07. Hence split application of N-K fertilizers with two equal splits applied at plantation and at 145 days after plantation and also light irrigation, 6 to 7 number with total amount of 460-500 mm including effective rainfall may be preferred for loamy and sandy loam soils.
