ABSTRACT
An experiment was carried out in farmers’ field of Shyampur sugar mills area, Rangpur under Active Tista Floodplain (AEZ-2) soils of Bangladesh during the year from 2013 to 2015. For this study six selected varieties viz: Isd 34 (Standard), Isd 36, Isd 37, Isd 38, Isd 39 and Isd 40 were planted following RCB design with three replications. Significant differences were observed for tiller population, millable cane, stalk diameter, single stalk height, stalk weight, yield of cane and ratoon as well as brix (%). In case of plant cane the highest cane yield of 105.78 tha-1 was observed in Isd 39 followed by Isd 37, while the highest ratoon cane yield (91.38 tha-1) was recorded from Isd 37 followed by Isd 39. The can plant ensured the higher yield than ratoon cane, but the higher brix (%) was observed in ratton cane. However, considering both the yield and brix (%) the release sugarcane varieties Isd 39 and Isd 37 may be recommended for sugarcane cultivation in Active Tista Flood plain (AEZ-2) of Bangladesh.
Key words: Sugarcane, plant cane, ratoon cane, yield, brix %

Introduction

Sugarcane (Saccharum ssp L.) is one of the most important crops in tropical and sub-tropical countries. It is the major sugar producing crop worldwide. Like other perennial grasses, it can regenerate shoots from the left–over stalk of preceding crops known as ratoon crop. Ratooning of sugarcane is a common practice throughout the world and ratoon occupies almost 50 percent of the total area under sugarcane production (Sundara, 2008). The major cane growing countries normally take two or more ratoons (Shrivastava, 1992). In Hawaii, Mauritius, Philippines and Cuba four to six ratoons are quite common (Misra and Mathur, 1983). In India, research strategies for sugarcane production through ratooning has been undertaken as an aid to cut down production cost (Shrivastava et al., 1990). In Bangladesh, only 20% of the cane area is ratooned every year producing in an average 40 tha-1 while the potential yield has been found to be around 80 tha-1 (Anon, 2001). The average yield gap between plant and ratoon crop is 20%-25% (Gomathi et al., 2013). Ratoon crop have often failed to produce satisfactory germination, growth and yield in Bangladesh due to lack of suitable ratooning varieties and proper management practices (Majid and Alam, 1998). Ratoon crop yields usually typically decreased with age hence, limit the economic production of sugarcane (Mirzawan and Sugiyarta, 1999). Growing ratoon is 30-40% cheaper about due to saving in irrigation, land preparation, cost of seed material and sowing operations (Akhtar et al., 2003). A ratoon crop matures prior to plant cane ensuring early supply of cane to mills. Under similar conditions sugarcane ratoon have a supplementary advantage of better juice quality and sugar recovery more than plant cane of same variety (Yang and Chen, 1991). The genetic potential of a variety to give better yields in plant and ratoon cane is the focal point for sustaining high productivity and its acceptance by the farmers for good ratooning potential (Arain et al., 2011). Thus, sugarcane varieties, which show good performance in plant and ratoon crop should be promoted for commercial cultivation. The objective of the present study is to evaluate the productivity and ratooning potential of some promising sugarcane varieties grown in Active Tista Floodplain areas of Bangladesh.