Suitability of Mechanical Transplanting of Hybrid Variety Rice in Unpuddled Soil Condition

摘要

Unpuddled transplanting of rice as a part of conservationagricultural practice has become significant due to its protectivebehavior for soil properties and economic profitability. Mechanicaltransplanting in unpuddled soil using hybrid rice variety leads to ahigh yield with minimum transplanting time and cost securing soilnutrients. A study was conducted in Bangladesh AgriculturalUniversity to evaluate the suitability of mechanical transplanting ofhybrid rice in unpuddled soil considering field and financialperformance of the rice transplanter. The experiment was conductedduring Boro-2018 season with a Daedong DP-480 rice transplanter.Hybrid rice seed Moyna (HTM303) of Laal Teer seed company Ltd.was used for transplanting with seed rate per tray of 120g andseedling per hill was adjusted to 2-3 nos. In unpuddled soil,transplanter possesses an effective field capacity, fuel consumptionand efficiency of 0.16 ha/h, 4.8 l/ha and 67.48%, respectively.Transplanting time includes an idle time of 11% due to clogging withmud. Missing hill percentage was found as 6.1% with a floating hillof 7.36%. Plant heights were 15.72 cm and 86.19 cm at the day oftransplanting and at the day of harvesting, with tiller per hill of 18nos. The average panicle length of plants was found as 23.61 cm. Theyields of mechanically transplanted rice in unpuddled soil conditionwas 5.21 ton/ha. Results reveal that mechanical transplanting ofhybrid rice was found possible in both puddled and unpuddled soilconditions than manual transplanting without compromising yield.The BCR and IRR of mechanical transplanting in unpuddled soil wasfound 1.57 and 55% considering discount factor as 10%. Thepayback period, after which the transplanter will overcome its costs,was found 1.68 years. Financial analysis reveals that mechanicaltransplanting with this field capacity will be beneficial if thetransplanter is used to transplant 19.77 ha annually.