ABSTRACT
To observe the growth and yield attributes of mustard under different irrigation frequency and fertilizer levels, a field experiment was conducted with mustard (Brassica sp.) var. “BARI Sarishal-15”. The experiment was carried out at the research field of the Department of Crop Science and Technology, Rajshahi
University, Rajshahi during the period from October, 2019 to February, 2020. The experiment consisted of three irrigation frequency i.e. no irrigation, 2 times irrigation and 3 times irrigation as well as three levels of fertilizers viz. 80-20-30 kg/ha NPK (Farmers practice), 90-30-40-25-1.0 kg/ha NPKSB (MYG) and 100-40-50-35-1.5 kg/ha NPKSB (HYG). The results revealed that different treatments significantly affected the growth and yield attributes of mustard. The combination of two times irrigation and highest level of fertilizer (HYG) produced the maximum plant height, no. leaves per plant, no. of branches per plant, pod length, no. of pods per plant, no. of seeds per pod, 1000 seeds weight, seed yield, straw yield and minimum days required to 50% flowering and maturity. On the other hand, all the studied parameters except days to 50% flowering and maturity found to be the lowest in no irrigation along with fertilization as farmers practice. Hence, the
study concluded that two times irrigation and 100-40-50-35-1.5 kg/ha NPKSB can be used for getting thetargeted yield as well as desired return from mustard cultivation in “High Ganges River Floodplain zones” of Bangladesh.

Key words: Irrigation, fertilizer, growth, yield, mustard

Introduction

Mustard (Brassica spp. L.) belongs to the family Brassicaceae (formally Cruciferae) is a cool season, thermo sensitive as well as photosensitive crop (Ghosh and Chatterjee, 1988). It is one of the most important oil crops of the world after soybean and groundnut. In Bangladesh context, mustard is popular edible oil in rural area and is considered important for improving the taste of a number of food items. Mustard is rich in minerals like calcium, magnesium, iron, vitamin A, C and proteins. 100 g mustard seed contains 508 kcal energy, 28.09 g carbohydrates, 26.08 g proteins, 36.24 g total fat, 12.2 g dietary fiber,
31 I.U. vitamin A, 7.1 mg vitamin C, 266 mg calcium, 9.21 mg iron, 370 mg magnesium and 738 mg potassium (USDA (2014). It is widely used as a cooking ingredient, condiment and for its medicinal value. It also serves as an important raw material for industrial use such as in soap, paints, varnishes, hair oils,
lubricants, textile auxiliaries, pharmaceuticals, etc. Moreover, mustard oil cake is utilized as cattle feed and small quantities are also used as manure. It covers about 80% of the total oilseed acreage and about 71% of the total production in Bangladesh (BBS, 2009). Last ten years have witnessed gradual decline in an area of
104 thousand hectare and production 68 thousand tons of mustard and rapeseed (Anonymous, 2006). Though the production of edible oil is being decreased, whereas, the demand is increasing day by day for increased population. Cultivation of low yielder local varieties, water and proper fertilizer management are
the major causes for poor yield of mustard in the country (Alam and Rahman, 2006). So, there is a great scope of increasing yield of mustard by selecting high yielding varieties and improving management practices. Mustard is mainly grown during the winter season (October-March). The growth yield attributes
and yield of mustard increased significantly with the increase in number irrigation. Adequate supply of moisture in soil helps in proper utilization of plant nutrients, ensuring proper growth and yield of mustard. The frequency of irrigation and the amount of water required depend on cultivar, soil type, season, amount of rainfall and diseases; therefore, it is difficult to give definite recommendation. Over irrigation, as well as under irrigation may lower yields. Indeed, irrigation had significant effect on all the yield and yield