A field study was conducted to assess the interaction effects of irrigation and nitrogen rates on hybrid maize yield. The research was conducted during December 2013 to April 2014 at the farmer field Tabaria area of Natore District in Bangladesh. The experiment consists of (i) two irrigation treatments viz. no irrigation and three irrigation and (ii) two nitrogen levels viz. no nitrogen use and 230 kg Nha-1.The experiment was laid out in a split plot design with three replications having 12 unit plots with 20 m2 sized. The interaction effect of irrigations and nitrogen levels significantly influenced the studied vegetative performances of BARI hybrid maize-7, where the growth attributes increased with increasing irrigation and nitrogen levels in all cases.
Key words: Nitrogen, irrigation, growth, maize.
Introduction The crop maize is gaining popularity in the country very quickly due to its high yield potential. Maize acreage and production have an increasing tendency with the introduction of hybrid since 1993 (Karim et al., 2010). The population growth in Bangladesh puts great pressure on the country’s food production. As regard food, cereal is still staple one for Bangladeshi people. In terms of human consumption maize also occupies the third position after rice and wheat in the country (HIES, 2005).The country is importing a huge amount of maize with the increasing demand from poultry and other feed industries. Therefore, maize has gained an increasingly important attention by the government. Now days, there are many organizations who are working for increasing maize production in Bangladesh. Maize production increased significantly during the last decade and still there is a large demand-supply gap. Local production cannot meet the demand and hence imports fill that gap. The growth of maize production did not spread all over the country though there are potential and still now is mainly concentrated in the north and north-western part of Bangladesh. However, Maize has high yield potential and responds well to different management practices. Among various management practices, irrigation and nitrogen play a significant role in realizing the maximum potential of the crop. Irrigation scheduling is the technology for applying the proper amount of water at the right time. Reasons for using irrigation scheduling are to reduce water applications, energy consumption and deep percolation of water below the crop root zone. Water is further required to provide constant turgor pressure that supports the plant and facilitates cell enlargement after cell division has been initiated. Hence, plant growth and survival depend on adequate water availability. Hence, the present study was therefore, undertaken to determine the optimum level of irrigation schedules and nitrogen rates for enhanced growth of maize in Bangladesh.